Frequently Asked Questions - Schneider Electric

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" landing-cards-prop="{"getGk":[{"Title":"What is the Nomenclature for Common Relays","UrlName":"FA212503","LastModifiedDate":"06/02/2026","score":1.0486440388879412,"firstpublisheddate":"18/11/2010","answer":"

Issue:
User wants to know the abbreviations for common relay types.

Resolution:

Normally Open (NO) contacts connect the circuit when the relay is activated; the circuit is disconnected when inactive. This type is also called Form A or a make contact.
Normally Closed (NC) contacts disconnect the circuit when the relay is activated; the circuit is connected when inactive. This type is also called Form B or a break contact.
Change-over (Double-Throw) contacts control two circuits: one NO and one NC contact with a common terminal. This type is called Form C or a transfer contact. It is often “break-before-make.” The opposite, “make-before-break,” is Form D.

Other common relay types:

SPST (Single Pole Single Throw): Two terminals that can be connected or disconnected. With coil terminals, there are four total. Contact can be NO or NC; abbreviations SPNO and SPNC clarify this.
SPDT (Single Pole Double Throw): One common terminal connects to either of two others. With coil terminals, there are five total.
DPST (Double Pole Single Throw): Two pairs of terminals, equivalent to two SPST relays operated by one coil. Six terminals total.
DPDT (Double Pole Double Throw): Two rows of change-over terminals, equivalent to two SPDT relays operated by one coil. Eight terminals total.
4PDT (Four Pole Double Throw)/Quadruple Pole Double Throw (QTDP) : Four rows of change-over terminals, equivalent to four SPDT relays or two DPDT relays operated by one coil. Fourteen terminals total.

$\"Diagrams\"$

"},{"Title":"What’s AC-3e rating means and what’s their application ?","UrlName":"FAQ000220784","LastModifiedDate":"29/09/2021","products":"TeSys Giga contactors","score":1.0168855534709194,"firstpublisheddate":"16/09/2021","answer":"AC-3e rating is the capability of the contactor for starting and switching off high efficiency squirrel cage asynchronous (IE-3/ IE-4) motors during running and reversing operations, which have extended/ higher locked rotor current."},{"Title":"Insulation Resistance Testing and Humidity","UrlName":"FA354645","LastModifiedDate":"06/12/2023","score":1.016459150605492,"firstpublisheddate":"11/07/2018","answer":"Issue:
How does humidity affect insulation resistance testing results?

Product Line:
Circuit Breakers

Environment:
Molded case and insulated case breakers

Resolution:
High humidity can drastically reduce insulation resistance testing results for circuit breakers.

Some equipment acceptance testing documents suggest values above 100 mega ohms and normally that is okay however high humidity can drastically reduce the results of the insulation resistance values. Below is a sample of how higher humidity can reduce the IR values, making the 100 mega ohms acceptance testing values invalid.
40% humidity: breaker IR value above 500 mega ohms, typical 1 G ohm*
75% humidity: breaker IR value around 10 mega ohms*
95% humidity: breaker IR value around 4 mega ohms*

*All values above are functional and conforming. Values derived from test data on Powerpact H frame breakers in a Schneider Electric laboratory.

The IEC 60947 standard, section 6.1.3.1 states that IR testing should be done below 50% humidity and states a 1 M ohm minimum IR value for a new breaker.

NEMA AB-4 recommends IR values for breakers, less than one mega ohm (1,000,000 ohm) should be investigated. The Schneider Electric field testing and maintenance guide also states the same one mega ohm value, as written below.

Severe environmental conditions can reduce the dielectric strength of
molded case circuit breakers. Check insulation resistance during electrical
system testing.
To check the insulation resistance, perform the following steps:
1. De-energize and isolate the circuit breaker.
2. Clean the circuit breaker as described earlier.
3. Using a megohmmeter with a capacity of 500–1000 Vdc, apply voltage
from:
a. Each phase-to-ground with the circuit breaker on (circuit breaker
contacts closed).
b. Phase-to-phase with the circuit breaker on (circuit breaker contacts
closed).
c. Between each line and load terminal with the circuit breaker off
(circuit breaker contacts open).
4. Record resistance values. Resistance values of less than one mega ohm
(1,000,000 ohm) should be investigated.
"},{"Title":"How to check the network by the PING command","UrlName":"FA226936","LastModifiedDate":"30/03/2026","score":1.0084427767354596,"firstpublisheddate":"30/03/2014","answer":"

On your PC, select the Window's [Start] button → [All Programs] → [Accessories] → [Command Prompt].
In the Command Prompt, enter "ping (the destination IP address)" and press ENT key.

$\"PING$

If it shows "0％ loss", the network is normal. However, there is some problem if it shows "100% loss". In this case, check your network environment.

"},{"Title":"How to establish the communication with S7-1500 PLC if using TIA Portal Ethernet Driver?","UrlName":"FAQ000225442","LastModifiedDate":"11/12/2025","score":1.0065666041275798,"firstpublisheddate":"06/12/2021","answer":"

In PLC side:

\n\n

1.Use TIA Portal V11-V16 to configure the PLC communication settings.

\n\n

2.Select the PLC and enter the correct version of the firmware (We can check for the firmware version of the PLC in online mode).

\n\n

3.Check the PLC firmware version in online mode, make sure the firmware version is supported by TIA Portal V11-V16.

\n\n

If the firmware version is not supported by TIA Portal V11-V16, communication may not be possible.

\n\n

If that happens, change the firmware to a version supported by TIA Portal V11-V16 .

\n\n

In EOTE side:

\n\n

1.Add TIA Portal Ethernet driver in EOTE.

\n\n

2.Linking TIA Portal symbols(.ap**) into the EOTE project.

\n\n

If there are changes to symbols in TIA Portal, linking the new PLC project file(.ap**) into the EOTE project again.

\n\n

"},{"Title":"Understanding common network and internet terminology.","UrlName":"FA179956","LastModifiedDate":"30/04/2025","score":1.0056285178236397,"firstpublisheddate":"20/07/2009","answer":"

Goals and Symptoms

\n\n

Internet users may require to know the current TCP/IP network configuration values for setting up their Ethernet devices for TCP/IP connection or sending/receiving Email. In the example below, the ION meter is required to have its own IP address, Subnet mask, Gateway, DNS and SMTP server etc. Some of this information may be found on the network, or a network administrator may have to provide details. This is a document shows how to find common information and also explains the terminology.
$\"Ion$
Causes and Fixes

\n\n

Displaying the current TCP/IP network configuration values:
Go to Start > Run > and type cmd and click ok. In the command line type ipconfig/all

\n\n

$\"cmd$

Ipconfig is a command line tool used to control the network connections on Windows NT/2000/XP machines. There are three main commands: "all", "release", and "renew". Ipconfig displays all current TCP/IP network configuration values and refreshes Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) settings. Used without parameters, ipconfig displays the IP address, subnet mask, and default gateway for all adapters.

\n\n

Understand internet terminology:

\n\n

DNS server

\n\n

Short for Domain Name System (or Service or Server), an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on IP addresses. Every time a domain name is used, a DNS service must translate the name into the corresponding IP address. For example, the domain name www.example.com might translate to 198.105.232.4.

\n\n

The DNS system is, in fact, its own network. If one DNS server doesn't know how to translate a particular domain name, it asks another one, and so on, until the correct IP address is returned.

\n\n

DHCP server

\n\n

Short for Dynamic Host Configuration Protocol, a protocol for assigning dynamic IP addresses to devices on a network. With dynamic addressing, a device can have a different IP address every time it connects to the network. In some systems, the device's IP address can even change while it is still connected. DHCP also supports a mix of static and dynamic IP addresses.

\n\n

Dynamic addressing simplifies network administration because the software keeps track of IP addresses rather than requiring an administrator to manage the task. This means that a new computer can be added to a network without the hassle of manually assigning it a unique IP address. Many ISPs use dynamic IP addressing for dial-up users.

\n\n

WINS server

\n\n

Short for Windows Internet Naming Service, a system that determines the IP address associated with a particular network computer. This is called name resolution. WINS supports network client and server computers running Windows and can provide name resolution for other computers with special arrangements. Determining the IP address for a computer is a complex process when DHCP servers assign IP addresses dynamically. For example, it is possible for DHCP to assign a different IP address to a client each time the machine logs onto the network.

\n\n

WINS uses a distributed database that is automatically updated with the names of computers currently available and the IP address assigned to each one.

\n\n

DNS is an alternative system for name resolution suitable for network computers with fixed IP addresses.

\n\n

IP Address

\n\n

An identifier for a computer or device on a TCP/IPnetwork. Networks using the TCP/IP protocol route messages based on the IP address of the destination. The format of an IP address is a 32-bit numeric address written as four numbers separated by periods. Each number can be zero to 255. For example, 1.160.10.240 could be an IP address.

Within an isolated network, IP addresses can be assigned at random as long as each one is unique. However, connecting a private network to the Internet requires using registered IP addresses (called Internet addresses) to avoid duplicates.

Every computer that communicates over the Internet is assigned an IP address that uniquely identifies the device and distinguishes it from other computers on the Internet. An IP address consists of 32 bits, often shown as 4 octets of numbers from 0-255 represented in decimal form instead of binary form. For example, the IP address

\n\n

168.212.226.204

\n\n

in binary form is

\n\n

10101000.11010100.11100010.11001100.

\n\n

But it is easier for us to remember decimals than it is to remember binary numbers, so we use decimals to represent the IP addresses when describing them. However, the binary number is important because that will determine which class of network the IP address belongs to. An IP address consists of two parts, one identifying the network and one identifying the node, or host. The Class of the address determines which part belongs to the network address and which part belongs to the node address. All nodes on a given network share the same network prefix but must have a unique host number.

\n\n

Class A Network -- binary address start with 0, therefore the decimal number can be anywhere from 1 to 126. The first 8 bits (the first octet) identify the network and the remaining 24 bits indicate the host within the network. An example of a Class A IP address is 102.168.212.226, where "102" identifies the network and "168.212.226" identifies the host on that network.

\n\n

Class B Network -- binary addresses start with 10, therefore the decimal number can be anywhere from 128 to 191. (The number 127 is reserved for loopback and is used for internal testing on the local machine.) The first 16 bits (the first two octets) identify the network and the remaining 16 bits indicate the host within the network. An example of a Class B IP address is 168.212.226.204 where "168.212" identifies the network and "226.204" identifies the host on that network.

\n\n

Class C Network -- binary addresses start with 110, therefore the decimal number can be anywhere from 192 to 223. The first 24 bits (the first three octets) identify the network and the remaining 8 bits indicate the host within the network. An example of a Class C IP address is 200.168.212.226 where "200.168.212" identifies the network and "226" identifies the host on that network.

\n\n

Class D Network -- binary addresses start with 1110, therefore the decimal number can be anywhere from 224 to 239. Class D networks are used to support multicasting.

\n\n

Class E Network -- binary addresses start with 1111, therefore the decimal number can be anywhere from 240 to 255. Class E networks are used for experimentation. They have never been documented or utilized in a standard way.

\n\n

Subnet mask

\n\n

A mask used to determine what subnet an IP address belongs to. An IP address has two components, the network address and the host address. For example, consider the IP address 150.215.017.009. Assuming this is part of a Class B network, the first two numbers (150.215) represent the Class B network address, and the second two numbers (017.009) identify a particular host on this network.

\n\n

Subnetting enables the network administrator to further divide the host part of the address into two or more subnets. In this case, a part of the host address is reserved to identify the particular subnet. This is easier to see if we show the IP address in binary format. The full address is:

\n\n

10010110.11010111.00010001.00001001

\n\n

The Class B network part is:

\n\n

10010110.11010111

\n\n

and the host address is

\n\n

00010001.00001001

\n\n

If this network is divided into 14 subnets, however, then the first 4 bits of the host address (0001) are reserved for identifying the subnet.

\n\n

The subnet mask is the network address plus the bits reserved for identifying the subnetwork. (By convention, the bits for the network address are all set to 1, though it would also work if the bits were set exactly as in the network address.) In this case, therefore, the subnet mask would be 11111111.11111111.11110000.00000000. It's called a mask because it can be used to identify the subnet to which an IP address belongs by performing a bitwise AND operation on the mask and the IP address. The result is the subnetwork address:

\n\n

Subnet Mask	255.255.240.000	11111111.11111111.11110000.00000000
IP Address	150.215.017.009	10010110.11010111.00010001.00001001
Subnet Address	150.215.016.000	10010110.11010111.00010000.00000000

\nThe subnet address, therefore, is 150.215.016.000.\n\n

\n\n

Gateway

\n\n

Gateway is a node on a network that serves as an entrance to another network. In enterprises, the gateway is the computer that routes the traffic from a workstation to the outside network that is serving the Web pages. In homes, the gateway is the ISP that connects the user to the internet.

\n\n

In enterprises, the gateway node often acts as a proxy server and a firewall. The gateway is also associated with both a router, which use headers and forwarding tables to determine where packets are sent, and a switch, which provides the actual path for the packet in and out of the gateway.

\n\n

SMTP

\n\n

SMTP is short for Simple Mail Transfer Protocol, a protocol for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP. In addition, SMTP is generally used to send messages from a mail client to a mail server. This is why both the POP or IMAP server must be specified and the SMTP server when the e-mail application is configured.

\n\n

POP

\n\n

POP is short for Post Office Protocol, a protocol used to retrieve e-mail from a mail server. Most e-mail applications (sometimes called an e-mail client) use the POP protocol, although some can use the newer IMAP (Internet Message Access Protocol). There are two versions of POP. The first, called POP2, became a standard in the mid-80's and requires SMTP to send messages. The newer version, POP3, can be used with or without SMTP.

\n\n

IMAP

\n\n

IMAP is short for Internet Message Access Protocol, a protocol for retrieving e-mail messages. The latest version, IMAP4, is similar to POP3 but supports some additional features. For example, with IMAP4, a search can be done through the e-mail messages for keywords while the messages are still on mail server. The messages found can then be downloaded to the client machine.

\n\n

"},{"Title":"NEMA Housing and Enclosure Rating Information,","UrlName":"FA219529","LastModifiedDate":"20/03/2025","score":1.0056285178236397,"firstpublisheddate":"28/08/2007","answer":"

Issue

\n\n

A user would like to know the different NEMA Housing and Enclosure Ratings and information about each rating.
\n

Product Line

\n\n

NEMA housing and enclosures.
\n

Environment
NEMA ratings

\n\n

Resolution
CLASS 1 GENERAL PURPOSE
For indoor use only; primarily utilized as protection against contact with the enclosed circuits. Commonly used on panel mounted recorded, meters, etc.

CLASS 3 WEATHER RESISTANT
(also known as “Weatherproof”, “Splashproof”, “Sleetproof”) For outdoor use; protects enclosed components from wind-blown dust, rain, sleet and external icing.
This enclosure is usually inadequate for protecting modern electronic instrumentation.

CLASS 4 WATERTIGHT (also known as “Hoseproof”)
Similar to “3” above; but also passes the “Hose Test”, which is described as: a 1 inch nozzle, delivering 65 gpm of water, from a distance of 10 feet, from all directions, for a 5 minute time period, no water leak to the interior is allowed.
This enclosure is the one of choice for most general outdoor applications.

CLASS 4X WATERTIGHT
Same as “4” above; also constructed of corrosion resistant materials suitable for the corrosive conditions of the installed location. The generally preferred materials are polyester/glass, stainless steel, and epoxy coatings.
This enclosure is the “standard” for protecting today’s plant instrumentation.

CLASS 6 SUBMERSIBLE
Used for protection against temporary submergence to limited depths (a 15-foot spec is common). These enclosures should also be rated NEMA 4X for conditions at the installation site.
Typical uses are in manholes, quarries, mines, etc.

CLASS 7 EXPLOSIONPROOF (GASES)

\n\n

CLASS I is a location with an atmospheric mixture of flammable gases. The enclosure is intended to contain an explosion internally while the surrounding ambient gas-air mixture is not ignited. These enclosures should also be rated NEMA 4 so as to be suitable for instrument service.

\n\n

DIVISION I is a location in which hazardous mixtures are expected during normal operations.
DIVISION II is a location in which the flammables are contained and escape only during a system rupture.
GROUP A: acetylene
GROUP B: hydrogen, manufactured gas or equivalent
GROUP C: ethyl ether, ethylene, cyclopropane, or equivalent
GROUP D: gasoline, hexane, naphtha, butane, alcohol, acetone, lacquer solvents, natural gas, and equivalents. Commonly used by oil refineries, petrochemical plants and sewage treatment plants.

\n\n

CLASS 9 EXPLOSION PROOF (DUSTS)

\n\n

CLASS II is a location hazardous because of combustible dusts. The enclosure excludes the dust from the internal power sources and ignition is thereby prevented. It also must not overheat when covered by a layer of the dust.

\n\n

DIVISION I locations are where suspended combustible dusts are expected during normal operations.
DIVISION II locations are where normal operations cannot put the dust into atmospheric suspension.
GROUP E: Metal dusts, electrically conductive, such as those of aluminum, magnesium, and their alloys.
GROUP F: Other dusts, electrically conductive, such as those of carbon black, coal, and coke.
GROUP G: Dusts such as those of grain, flour, and starch.

\n\n

CLASS 12 INDUSTRIAL USE
Intended for indoor use; provides protection against dust and dripping liquids; used in machine shops, etc.

CLASS 13 INDUSTRIAL USE
Similar to “12” above, but also provides protection against spraying oil, water, coolant, etc. Used for enhanced protection of electronic instruments in manufacturing plants and similar environments.

https://www.nema.org/membership/products/view/enclosures

"},{"Title":"What are the effects of dV/dt on a Motor when using a VSD?","UrlName":"FAQ000134179","LastModifiedDate":"15/10/2021","products":"AC Drives and Soft Starters","score":1.0046904315196998,"firstpublisheddate":"08/02/2021","answer":"As there is an impedance mismatch at the termination of the motor cable to the motor, there will be a reflected wave which travels back along the motor cable causing
overvoltage’s. Overvoltage’s on the motor terminals can cause both partial and corona discharge which eventually wears down the winding insulation to failure.

Corona discharge occurs when the overvoltage is large enough to cause electrons to flow from one winding to another whilst ionising the air between the conductors. They cause damage to the internal and external insulating material respectively. As the motor cable length increases the peak voltage increases. This can increase to a value of 2 to 2.5 times the DC bus voltage.

Schneider Electric Offer Sinus filters or dv/dt filters to reduce the overvoltage across windings and high frequency currents in differential mode. Check out our current ATV600 or ATV900 catalogue for more information on output filters to help you with overvoltage mitigation.

$\"\"$ "}],"getPv":[{"Title":"Video: How do I program an ATV320 to use the dial of drive as speed and Digital Input 1 (DI1) terminal as start and stop control?","UrlName":"FA308988","LastModifiedDate":"07/10/2024","products":"Altivar 320","score":1.0017873100983021,"firstpublisheddate":"15/02/2017","answer":"Issue:
ATV320 to use the dial of drive as speed reference and Digital Input 1 (DI1) terminal as start/stop control

Product Line:
Altivar 320, ATV320

Environment:
All

Cause:
Programming setup

Resolution:

From Main Menu, press enter.
Scroll down to CONF and press enter.
Scroll down to FULL and press enter.
Scroll down to CTL and press enter.
Under CTL, set CHCF to SEP.
Set FR1 to A1U1.
Set CD1 to TER.

From the normal status display, press enter twice to then adjust the speed reference value as a % of the LSP-HSP range."},{"Title":"How to reset relay for out of service condition MiCOM Px30 series","UrlName":"FA371381","LastModifiedDate":"03/09/2025","products":"C65H/L-DC (China)","score":1.0014193344898281,"firstpublisheddate":"15/03/2019","answer":"
Reset a protection relays MiCOM Px30 series for out of service condition
Only qualified personnel, trained, authorized and familiar with the device and all local safety instructions, shall work on the protection device.
"},{"Title":"Video: How to view measurements, event logs and disturbance records directly from a MiCOM Px40 series relay","UrlName":"FA284227","LastModifiedDate":"11/12/2024","products":"Easergy Flite 116-SA & G200, Easergy Flite, Easergy Flair, Easergy Flair 200C","score":1.001261630657625,"firstpublisheddate":"29/06/2016","answer":"Issue
The user would like to view measurements remotely via Easergy Studio ( formerly known as MiCOM S1 Studio) as well as retrieve on-board event logs and disturbance records.

Product Line
Easergy Studio

Resolution
The video below explains how to view any available measurement and download event logs and disturbance records directly from the Micom Px40 relays using Easergy Studio. The user needs to download and install Easergy Studio before proceeding with this video. This video assumes that the relay is pre-configured and can communicate over Ethernet, serial or using the front panel DB-9 port. Attached below is the Easergy Studio Help Guide as a reference.

"},{"Title":"How to locate a powertag in an installation","UrlName":"FA360612","LastModifiedDate":"28/07/2025","products":"PowerTag, Acti9 Smartlink SI D, Acti 9 PowerTag Link C","score":1.0009987909372864,"firstpublisheddate":"02/10/2019","answer":"(1) Download the eSetup for Electrician app from your apple store or google play store
(2) Launch eSetup [enabling bluetooth on your phone]
(3) Select the white button in the bottom left hand corner of the Acti 9 Smartlink EL D - Wireless to Modbus TCP/IP Concentrator
(4) You should now be able to see the device on the eSetup app. Select the device on the app
(5) All powertags which are connected to the installation will now be listed. Select the first power tag
(6) There will now be a green button with the word "Locate". Press this button
(7) The power tag selected will now start flashing for you to easily locate.
"},{"Title":"Video: How to separate the ANSI 50 (Instantaneous phase over current) from the ANSI 51 (delayed phase over current) protection on a SEPAM digital relay offers ANSI 50/51 over current protection.","UrlName":"FA179986","LastModifiedDate":"20/03/2025","products":"Sepam series 20, Sepam series 80, Sepam series 40","score":1.000893655049151,"firstpublisheddate":"14/08/2010","answer":"

Issue
Need to program the SEPAM for instantaneous and curved (IDMT) over current protection.

Product
SEPAM 20
SEPAM 40
SEPAM 80

Resolution
The ANSI 50/51 protection option in SEPAM relays combine both ANSI 50 instantaneous phase over current protection and ANSI 51 delayed phase over current protection.
In order to activate ANSI 50 protection, an instantaneous delay of 0 ms must be set for the time delay. Confirmed instantaneous operation times are:

\n\n

inst. < 50 ms at 2 Is for Is >= 0.3 In (typically 35 ms)
inst. < 70 ms at 2 Is for Is < 0.3 In (typically 50 ms)
$\"Setting$

In order to activate ANSI 51 protection, a delay greater than 50 ms must be set for the same parameter setting time delay. This will allow the end-user to use ANSI 51 delayed phase over current protection.

$\"Setting$

Below is a video to help program the basic needs for over current protection using circuit breaker control featuring the SEPAM™ 20 Series as an example:

"},{"Title":"Video: How is automatic restart configured on the ATV21 / ATV212 drive?","UrlName":"FA176961","LastModifiedDate":"20/03/2025","products":"Altivar 212","score":1.0008410871050832,"firstpublisheddate":"12/12/2013","answer":"Issue:
Video: Automatic restart on the ATV21 / ATV212 drives

Product Line:
ATV21 and ATV212

Environment:
All serial numbers for ATV21 and ATV212

Cause:
Certain faults can be automatically reset after the cause has cleared. The drive will then restart the motor.

Resolution:
Set F303 to any value, from 1 to 10, indicating the number of attempts to clear the detected fault.
By factory default F303 is set to 0. A value of 0 disables the feature.
If the fault clears, the drive will restart the motor if the run command is active.
If the fault does not clear after all attempts are made, the drive will require a manual reset.

The first clear is attempted 1 second after the detected fault occurs. Each subsequent clear attempt adds 1 second to the time interval between attempts.

$\"manual\"$

See the ATV212 Programming Manual, page 135 for further details."},{"Title":"Video: How to simulate an analog input with Unity","UrlName":"FA334698","LastModifiedDate":"12/02/2026","products":"Modicon Quantum, Modicon M340, Modicon M580","score":1.0007885191610155,"firstpublisheddate":"24/05/2018","answer":"

Unity Pro offers the Write _Input_Int block which can be used to accomplish either task. The video linked to this FAQ will demonstrate this functionality using an M340. The information is also valid for M580 and Quantum PLC's.

If this FAQ did not solve your issue, you can chat with us at chat with us or e-mail us at customer.services@se.com to create a case with our Technical Support Team.

If you are not located in North America, please contact your local Customer Care Center for assistance:

Support | Schneider Electric Global (se.com)

"},{"Title":"How to set CT & VT ratios on MiCOM P632","UrlName":"FA371378","LastModifiedDate":"03/09/2025","products":"C65H/L-DC (China), MiCOM P63x","score":1.0007885191610155,"firstpublisheddate":"14/03/2019","answer":"
Discover the best way to set up Current Transformer and Voltage Transformer ratios on MiCOM P632 protection relay.
Only qualified personnel, trained, authorized and familiar with the device and all local safety instructions, shall work on the protection device.
"},{"Title":"How to reset relay after trip MiCOM Px30 series","UrlName":"FA371379","LastModifiedDate":"03/09/2025","products":"MiCOM P63x, C65H/L-DC (China)","score":1.0007359512169478,"firstpublisheddate":"15/03/2019","answer":"
View procedure to reset MiCOM Px30 series protection relays after trip
Only qualified personnel, trained, authorized and familiar with the device and all local safety instructions, shall work on the protection device.
"}],"getPa":[{"Title":"Can I use a larger HP Variable Speed Drive to run a smaller HP motor?","UrlName":"FA167794","LastModifiedDate":"12/12/2024","products":"Altivar 320, Altivar 32, Altivar 340, Altivar Process ATV900, Altivar 71, Altivar 61, Altivar Process ATV600, Altivar 212, Altivar 31C","score":1.001669397150619,"firstpublisheddate":"25/02/2013","answer":"Issue:
Motor is smaller than the available drive.

Product Line:
All Altivar (ATV) drives

Environment:
All Environments

Cause:
Motor and drive sizing does not match. Motor is smaller HP than Drive.

Resolution:
YES.
In most cases a drive can control a motor with lower HP (and current) rating.

The motor nameplate information will have to be entered correctly to ensure proper control of the motor and that the overload protection is enabled.
In most cases the Overload protection adjustment range is the limiting factor. If this parameter can not be set down to the motor FLA, an external overload relay will have to be provided.
When using small motors on a larger drive the Sensorless Flux Vector motor control modes may not work well. Changing the motor control type to linear Voltage/Frequency is usually best.
Consult the programming manual for the drive being used for details on these parameter adjustments.
If working with an enclosed drive that has full voltage bypass, the Overload Relay in the bypass circuit may need to be changed if it's OL settings can not be adjusted down to the motor FLA.

NOTE that this does not pertain to Softstarts. Softstarts will not work well with motors that are less than 40% of their continuous current rating."},{"Title":"Is it possible to modify the ratio of a current transformer (CT)?","UrlName":"FA212311","LastModifiedDate":"07/10/2024","products":"3090SCCT063, 3090SCCT124, 3090SCCT083, 3090SCCT022, 3090SCCT204, 3090SCCT032, 3090SCCT084, 3090SCCT164, 3090SCCT043","score":1.0006428734368844,"firstpublisheddate":"14/11/2009","answer":"

Product Line
3090SCCT

Environment
CT Ratio

Resolution
*Warning: Installation and maintenance of this device should only be performed by qualified, competent personnel that have appropriate training and experience with high voltage and current devices. Failure to follow the instructions / warnings in the Meter Installation Guide can result in permanent damage to the meter, severe injury or death.

Note: This is not a suggested solution. It is recommended that the appropriate CTs be purchased for each application.

The ratio assigned to a current transformer is based on the assumption that the primary conductor will only pass through the current transformer opening once. It is possible to reduce the rating by looping the primary conductor through the opening multiple times. The rating will be reduced by the times the primary conductors is looped through the CT. For example, a CT with the rating of 400:5A will be changed to 100:5A if four loops or turns are created by passing the primary conductor through the CT four times. See illustration and table below.

\n\n

$\"Primary$

\n
The ratio of the current transformer can also be modified by changing the number of secondary turns by either passing the secondary lead forward or backward through the current transformer opening.

Ip / Is = Ns / Np

Ip = primary amperage
Is = secondary amperage
Ns = number of secondary turns
Np = number of primary turns

400p / 5s = 80s / 1p

Note: One turn is dropped from the secondary as a ratio correction factor.

By adding secondary turns, while keeping the primary amperage the same will result in greater secondary output. For example, using the 400:5A current transformer, by adding 5 secondary turns it will now require 425 amps on the primary to maintain the 5 amp secondary output.

400p / 5s = 80s / 1p
Xp / 5s = 85s / 1p , where Xp equals the primary amperage.
Solving for Xp gives a requirement of 425 amps on the primary.

Similarly, subtracting 5 secondary turns will now require 375 amps on the primary to maintain the 5 amp secondary output.

400p / 5s = 80s / 1p
Xp / 5s = 75s / 1p , where Xp equals the primary amperage.
Solving for Xp gives a requirement of 375 amps on the primary.\n

$\"Adding$

\n
Original Source: scribd/doc/16962202/Transformer-Turn-Ratio(no longer available)

"},{"Title":"VIP400 protection relay - what is the IP rating of the CUa / Cub / CUc sensors, and can they be used in outdoor applications?","UrlName":"FA239612","LastModifiedDate":"16/06/2025","score":1.0005599220256736,"firstpublisheddate":"25/01/2015","answer":"

The VIP 400 (and 410) self-powered relays use custom sensors that are designed specifically for this relay. As such, the CUa / CUb / CUc sensors cannot be ordered as loose components, and some details such as the IP rating are not given in the VIP400 user manual. This FAQ contains some details that relate to the IP rating of the VIP400 sensors.

\n\n

a) the sensors are type tested according to the IEC60044-1 and IEC61869-2 standards. The sensors are not subjected to the "routine tests" defined in those standards.

\n\n

b) the sensors are enclosed in a moulded casing with wires that extend out from the casing, so they are theoretically hermetically sealed. However, they have not been designed for outdoor applications, and this type of usage is not approved by Schneider.

\n\n

c) from the design perspective, the IP rating for the CUa and CUb sensors is IP67 with the terminals not submerged, and the conductor of the wires exposed.

\n\n

As a general remark, each installation of the VIP400 relay must be validated separately, which includes the switchgear that houses the VIP400 relay. Therefore, the IP rating of the sensor cannot be considered in isolation - the complete cubicle must be designed and validated separately for each project. This information was provided by the Schneider Instrument Transformer experts in France and Italy.

AEDL3

"},{"Title":"Can multiple motors be connected to one solid state soft starter?","UrlName":"FA114924","LastModifiedDate":"12/12/2024","products":"Altistart 48, Altistart 22","score":1.0005599220256736,"firstpublisheddate":"26/01/2006","answer":"Issue:
Can multiple motors be connected to 1 soft starter?

Product Line:
ATS48 ATS22

Environment:
All

Cause:
Application requirement

Resolution:
Yes.
Size the soft starter for the total full load amps of all motors to be connected.
Provide separate overload protection for each motor.

For ATS48: Make sure the CLP parameter in the drC menu is set to OFF.
For ATS22: Make sure SSC parameter in the Adj menu is set to OFF.

Motor connections to the soft starter output should not be made or broken while the soft starter is running. The resulting sudden change in current will cause problems and possible damage to the soft starter or other equipment.

"},{"Title":"Is a Line Contactor ahead of the soft start required as referred to in the ATS22 users manual?","UrlName":"FA222188","LastModifiedDate":"16/06/2025","products":"Altistart 22","score":1.0005391841728708,"firstpublisheddate":"18/02/2014","answer":"

Issue:
Is a Line contactor required ahead of the soft start?

Product Line:
Altistart 22, ATS22

Environment:
All models and serial numbers

Cause:
None

Resolution:
The purpose of the line contactor is to provide a means of removing AC line voltage from the softstart. Due to leakage currents through the solid state switches, hazardous voltages can be present on the load side of the softstarter when power is applied to the line side of the softstarter.
Also, the line contactor can be controlled to open if the ATS22 faults. Some faults are the result of SCRs shorting. If multiple SCRs fail in a shorted condition, full voltage power passes through and will either single phase or continue to run the motor. The KM1 would interrupt the power circuit.

A line or isolation contactor such as KM1 shown in wiring diagrams, located in the Annex of the ATS22 Users Manual (BBV51330) is strongly suggested but not required.

"},{"Title":"VIP400 and VIP410 embedded battery lifetime and effect of supplying LED lamps for 24-hour period following a trip.","UrlName":"FA239578","LastModifiedDate":"16/06/2025","score":1.0005080773936668,"firstpublisheddate":"25/01/2015","answer":"

As per the VIP400 / VIP410 user manual, this self-powered relay uses a LS14250 3.6V lithium battery (power rating 1.10Ah) manufactured by SAFT industries.

\n\n

The expected lifetime quoted in the user manual is based on laboratory measurements and simulations.
The result is an announcement of 10 years but actually there should be a very comfortable safety margin of approximately 1.5 to 2 times.

\n\n

Regarding the effect of a trip event on the battery lifetime, according to the documentation the "TRIP" LED will flash during a maximum of 24 hours after a fault. During this time, the LED's are powered by the embedded battery.
This extra consumption does NOT reduce the guaranteed lifetime due to the margin.

\n\n

As a conclusion, any usage not significantly different from what could be expected for a standard protection relay will not decrease the battery lifetime under the quoted value of 10 years.

AEDL3

"},{"Title":"SFT2826 cannot open SEPAM COMTRADE files for recent firmware versions. Is it obsolete?","UrlName":"FA239653","LastModifiedDate":"24/09/2025","products":"Sepam series 80","score":1.0004977084672653,"firstpublisheddate":"25/01/2015","answer":"

Issue
Cannot open the waveform using SFT2826.

Product Line
SEPAM 20 Series
SEPAM 40 Series
SEPAM 50 Series
SEPAM 60 Series
SEPAM 80 Series

Cause
The SFT2826 software was developed originally for displaying waveforms captured on SEPAM Series 20, 40, and 80 relays. The software has not had major improvements made since the launch of the SEPAM 80 range.

Since the end of development for the SFT2826 software, there have been some changes to the values used for certain parameters in SEPAM Series 80 COMTRADE disturbance records. This FAQ gives one example and explains why the user should consider using other software besides SFT2826 to visualize SEPAM disturbance records.

Please refer to the IEEE C37.111-1999 standard for more information on the COMTRADE file format. A COMTRADE file from a SEPAM relay includes a .CFG file and a .DAT file. This FAQ refers only to the contents of the .CFG file, which can be opened for viewing with Notepad, or any ASCII text editor.

The image below shows the bottom portion of the .CFG file taken from a waveform that was captured on a SEPAM 80 relay running firmware version V5.21. As shown, the value of the "nrates" parameter is "01."

$\"\"$

The next image below shows a screenshot of the last section of a different .CFG file taken from a SEPAM 80 relay running firmware version V8.02. Notice that the "nrates" parameter has a value of "00."

$\"\"$

The SFT2826 software was not designed to open COMTRADE files having the "nrates" parameter set to "00." Therefore, the software cannot be used to open such files, and an error message will be encountered if this is attempted. This modification in the SEPAM 80 COMTRADE files was made starting in the V8.01 firmware version (approximately). The purpose of this modification was to handle variable sampling rates inside a single disturbance record.

Resolution
To resolve this issue, it is recommended to use other software applications such as WaveWin or Transview (by OMICRON) to open SEPAM COMTRADE files. Both of these applications are able to open all SEPAM waveform files, regardless of the firmware version of the relay used to capture the waveform. Although SFT2826 could still be used to visualize waveforms captured using older firmware versions, it is recommended to use WaveWin or Transview to view all SEPAM waveforms in general. Here is the link for WaveWin https://www.se.com/ww/en/download/document/WAVEWIN_Version_HG6/

"},{"Title":"How to upload a pre configured CID/IID file to a MiCOM relay?","UrlName":"FA241248","LastModifiedDate":"20/03/2025","score":1.0004666016880612,"firstpublisheddate":"12/03/2015","answer":"Issue
Cannot upload a pre configured CID/IID file to a MiCOM relay.

Product Line
MiCOM Relays

Environment
IEC61850 communications

Cause
MiCOM relays expects a MCL file for IEC61850 configuration settings.

Resolution
Unfortunately, a CID/IID file cannot be uploaded directly to a MiCOM relay. The CID/IID file needs to be converted into an MCL file before the configuration settings can be uploaded to the relay.

This can be done by following the below steps:
1. Depending on the version of IEC61850 edition being used select the appropriate configurator from Tools.

$\"IED$

2. Once the configurator is open, go to File--> Import SCL

$\"Import$

3. Select the appropriate SCD/CID/IID file that needs to be converted.

$\"Select$

4. Open the SCD/CID/IID and then go to File--> Save.

$\"Open$

$\"Save\"$ "}]}" translations="{"tabs":{"popularArticles":"Popular Articles","popularVideos":"Popular Videos","generalKnowledge":"General Knowledge","sections":{"popularVideosTitle":"Popular Video FAQs","popularVideosTitleMobile":"Popular Videos","generalKnowledgeTitle":"Learn more through our Generic Knowledge FAQs","generalKnowledgeTitleMobile":"General Knowledge"}},"searchDocument":{"category":"Product category","publishedDate":"Published on","modifiedDate":"Last Modified on"},"moreButton":{"labelMore":"Show more","labelLess":"Show less"},"Redirection":{"message":"The FAQ you are looking for is no longer available, we have redirected you to your Country FAQ home page. Please use the FAQ search bar provided in the home page to search for your query."}}" env="new" s-id="6448">

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