Woodward
Manual MRM3-2 GB
40
TD_MRM3-2_09.08_GB_Rev.New
6. Notes on Relay Tests and Commissioning
6.1 Connection of the auxiliary voltage
To prevent destruction of the relay during tests the following has to be observed:
•
The aux. voltage supply of the relay must be within the permissible ranges.
•
The test current must not exceed the thermal rating of the measuring circuits.
•
The CTs must be connected properly.
•
All control and measuring circuits as well as the output relays must be connected properly.
•
The voltage ranges of the digital inputs must be adjusted correctly.
For further information please see Technical Data
6.2 Testing of Output Relays and LEDs
Checking of the output relays and of all LEDs can be triggered by the <TRIP>-push-button.
Test procedure
Entry Display
Note
<TRIP> DO1
Display of the relay software version (part 1)*
<TRIP> 1.00
Display of the relay software version (part 2)*
<TRIP> PSW ?
Call for enter the password
PSW?
**** TRI ?
Password entry
Ready for tests
<TRIP> TRIP
Start the test
Release of self-test relay
Pick-up of all output relays
Test of all LEDs
<Select/
Reset>
SEG Finish
the
test,
Output relays return to their current operational state
* If possible please state when writing to us.
Careful when the relay is installed:
The relay test is not a pure internal test. All the output re-lays will be energized! After starting test
the self-supervision relay releases first. Hereby a relay fault could be adopted by a connected con-
trol gear.
Thereafter all other existing output relays will pick up one after another. The reaction in the relevant
switchboard could be accordingly (e.g. trip of a priority CB).
