Rockwell Automation Publication 825-UM004D-EN-P - November 2012 151
Testing & Troubleshooting Chapter 11
20. Perform any protection element tests using the individual element test
procedures in Selected Functional Tests on page151.
Perform the tests until it is proven that the relay operates as intended.
Exhaus
tive element performance testing is not necessary for
commissioning.
21. Con
nect the relay for tripping duty.
22. Verify that any settings changed during the tests performed in St
ep 19
and
Step 20 are changed back to the correct values for your application.
23. Prepare the relay for operation by clearing the relay data buffers using
MPS
Explorer software.
Clearing the relay buffers prevents data generated during commissioning
t
est
ing from being confused with operational data collected later.
24. Start the motor
only when it is safe to do so.
25. Verify the following AC quantities using the front panel METER or serial
port
METER command:
• p
hase current magnitudes are nearly equal and
• phase current angles are balanced, have proper phase rotation, and have
the a
ppropriate phase relationship to the phase voltages.
26. If your relay is equipped with voltage inputs, verify the following:
• phase voltage magnitudes are nearly equal.
• Phase voltage phase angles are balanced and have proper phase rotation.
Th
e 825-P relay in now ready for continuous service.
Selected Functional Tests
Phase Current Measuring Accuracy
1. Connect the current source to the MCM converter module, as shown in
Figure 50.
Figure 50 - Current Source Connections
MCM 825-P
Cable with
Plugs
135
246
Current
Test
Source
IA
IB
IC
IN
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