Schweitzer Engineering Laboratories SEL-351-7 User Manual (English)

Questions and Answers:

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alvarezdeannaAug 9, 2025
What to do if Schweitzer Engineering Laboratories Relays don't respond to faults?
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  amy05Aug 9, 2025
  If your Schweitzer Engineering Laboratories Relays don't respond to faults, several factors could be at play. First, verify that the relay settings are correct. Next, check the test source settings. Inspect the CT or PT input wiring for any errors. Ensure the analog input cable between the transformer secondary and the main board is securely connected and not defective. Finally, identify any self-test failures that may have occurred.
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Rebecca Watson DDSAug 15, 2025
What to do if Schweitzer Engineering Laboratories SEL-351-7 don't respond to commands from device connected to serial port?
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  Melanie GarciaAug 15, 2025
  If the Schweitzer Engineering Laboratories Relays do not respond to commands from a device connected to the serial port, ensure the communications device is properly connected to the relay. Also, verify that the baud rate and communication parameters are correctly configured on both the relay and the communications device. If the relay serial port has received an XOFF, type Q to send an XON and restart communications.
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Heather CrossAug 20, 2025
Why Schweitzer Engineering Laboratories SEL-351-7 meter command does not respond as expected?
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  Jacob Charles MDAug 20, 2025
  If the Schweitzer Engineering Laboratories Relays meter command does not respond as expected, first check the global settings, specifically PTCONN, VSCONN, NFREQ, and PHROT, to ensure they are correctly configured. Next, review the group settings CTR, CTRN, PTR, or PTRN. Finally, verify that the relay analog inputs are correctly connected.
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Melissa RodriguezAug 27, 2025
What to do if cannot see characters on Relay LCD screen of Schweitzer Engineering Laboratories?
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  antonio94Aug 27, 2025
  If you cannot see characters on the LCD screen of your Schweitzer Engineering Laboratories Relays, the relay may be deenergized. Check to see if the ALARM contact is closed. If the relay is energized, the LCD contrast may be out of adjustment. Follow the steps in the manual to adjust the contrast.
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Brian DiazSep 2, 2025
Why are all front-panel LEDs dark on my Schweitzer Engineering Laboratories SEL-351-7?
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  Richard MatthewsSep 2, 2025
  If all the front-panel LEDs on your Schweitzer Engineering Laboratories Relays are dark, it could be due to a couple of reasons. First, check the power supply to ensure input power is present and the fuse is not blown. Alternatively, it could indicate a self-test failure, so identify any self-test failures.

Schweitzer Engineering Laboratories SEL-351-7 Specifications

General

Frequency	50/60 Hz
Serial Ports	2
Current Rating	Up to 5 A
Communication Protocols	DNP3, IEC 61850, Modbus
Digital Inputs	8
Operating Temperature	-40°C to +85°C
Protection Functions	Overcurrent, Overvoltage
Mounting	Panel or DIN rail