GEK-113188A
MIGII Digital Protection for Electrical Machines
12-1
12 MIFII DO’S AND DON’TS
12.1 DO’S
12
12 MIFII DO’S AND DON’TS 12.1DO’S
WARNING:
When communicating with the RS232 front port of the relay, ensure that the relay is properly grounded (ground must be
at the same level of the PC). Otherwise, use ungrounded PC.
•
Read the instruction manual carefully before installing the device.
•
Check the power supply rating before applying power to the relay.
Applying voltage greater than the maximum rating of the power supply (the actual rated voltage for an MIGII relay is
indicated in the front panel) can result in permanent component damage to the relay’s power supply.
•
Ensure that the source CT secondary matches the relay CT rated current .
MIGII can be ordered with either 1A or 5A phase and ground CTs . Verify that the relay rated current (indicated in the
front panel) matches the secondary rating of the connected CTs. Unmatched CTs may result in equipment damage or
inadequate protection.
•
Check the correct polarity of the RS-485 connections.
Different manufacturers of Modbus
®
compatible devices including RS-485 ports can use different criteria for defining
port polarities. In order to avoid misuse of the MIGII rear communication port, please verify connections in accordance
with information provided in the MIGII instruction book.
Summary of Contents for Multilin MIGII
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