21/07/2010
21
MRAR 01/96 C
7. Testing
Please note that these tests are not intended to give detailed information of the type tests carried out on
the MRAR but are function tests only.
7.1 Power On
Switch on the auxiliary supply to the unit, terminals 1 and 2, and check that the message "
P&B
" appears
on the display and that the self supervision alarm relay is energised, terminals 49 and 51 are closed.
7.2 Output Relay Tests
Press the <TRIP> push button until the display shows the message "
PSW?
". Enter the correct password
and the message "
TRI?
" will appear on the display. Press <TRIP> again and all the output relays,
except CB Close terminals 31-33 and 32-34, will close one after the other at one second intervals. Press
the <SELECT/RESET> push button and the relays will return to their original state. Please note, prior to
commencing this test, it is advisable to block the output circuits to avoid unnecessary tripping of the
circuit breaker.
7.3 Checking the Set Values
By repeatedly pressing the <SELECT> push button, you can check all the unit set values. Modification
is via the <UP> and <DOWN> push buttons followed by <ENTER>.
7.4 Checking the CB Status Input Circuit (28-15)
Apply auxiliary voltage to terminals 28 and 15, the red tR LED, Reclaim Time, should illuminate. After
the preset time delay, the LED is extinguished and the green OK LED is lit which indicates the unit is
ready for an auto-reclosing. The High Set Block output relay, terminals 38 and 40 closed, is energised.
7.5 Checking the External Block Input Circuit (24-15)
Apply auxiliary voltage to terminals 24 and 15, the green OK LED should be extinguished immediately
and the red LO LED is illuminated to show that the unit is blocked. The High Set Block output relay,
terminals 38 and 40 open, is de-energised.
7.6 Checking the External Reset Input Circuit (25-15)
Disconnect the auxiliary voltage from terminals 24 and 15 and reapply to terminals 25 and 15. The red
LO LED should extinguish and the Reclaim Time, tR, LED should light; remaining lit until the preset
reclaim time has elapsed. The green OK LED will then be illuminated and the High Set Block output
relay will be energised. The unit is now ready for auto-reclosing.
