M-LIB3 Low Impedance Bus Differential Relay
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6.16 MANUAL AND AUTOMATIC TEST OPERATION

6.16.1 Mode "TESTPROG" subprogram “W/O TRIP"

Operation of the yellow key activates a complete test of the electronics and the process routines.
All the LEDs are lit-on and the display shows (TEST RUN). If the test routine is successfully completed
the display switches-over to the default reading (dAxx.xxn). If an internal fault is detected, the display
shows the fault identification code and the relay R5 is de-energized. This test can be carried-out even
during the operation of the relay without affecting the relay tripping in case a fault takes place during
the test itself.

6.16.2 Mode "TESTPROG" subprogram "WithTRIP"

Access to this program is enabled only if the current detected is zero (breaker open).
Pressing the yellow key the display shows "TEST RUN?". A second operation of the yellow key starts a
complete test which also includes the activation of all the output relays. The display shows
(TEST RUN) with the same procedure as for the test with W/O TRIP. During the normal operation the
relay continuously operates an auto test procedure. If any internal fault is detected during the auto test,
the relay R5 is de-energized, the relevant led is activated and the fault code is displayed. If at the next
automatic test no internal fault is detected the display and R5 reset.
q Further operation of key SELECT instead of the TEST programs gives the indication of the version and
production date of the firmware.
WARNING
Running the WithTRIP test will operate all of the output relays. Care must be taken to ensure that no
unexpected or harmful equipment operations will occur as a result of running this test.
It is generally recommended that this test be run only in a bench test environment or after all dangerous output
connections are removed.
6.17 MAINTENANCE
No maintenance is required. Periodically a functional check-out can be made with the test procedures
described under MANUAL TEST chapter. In case of malfunctioning please contact
Cooper Power Systems or the local Authorized Dealer mentioning the relay's Serial No reported in the label on
relays enclosure.
WARNING
In case of Internal Relay Fault detection, proceed as indicated :
q If the error message displayed is one of the following “DSP Err”, “ALU Err” ,”KBD Err” ,”ADC Err”, switch off
power supply and switch-on again. If the message does not disappear send the relay to Cooper Power
Systems (or its local dealer) for repair.
q If the error message displayed is “E2P Err”, try to program any parameter and then run “W/OTRIP”.
q If message disappear please check all the parameters.
q If message remains send the relay to Cooper Power Systems (or its local dealer) for repair.