Figure 5-29. Test Setup, Over/Undervoltage Relay K110 and K111
5-35. UNDERVOLTAGE RELAY K111 (64, Figure 5-9).
Inspect. See Figure 5-9.
Inspect screw and captive washer assemblies (62) and electrical connections for security.
Inspect wires connected to undervoltage relay Kill (64) for evidence of burning or insulation breakdown.
Remove. See Figure 5-9.
Tag and disconnect wires from overvoltage relay K111 terminals.
Remove overvoltage relay K11 (64) by removing screw and captive washer assemblies (62).
Preparation for Bench Test.
Remove overvoltage relay K111 in accordance with step b, above.
Obtain a 3 phase, O to 250 V ac variable voltage source with a built-in voltmeter, a multimeter, (a
relay tester) and a stopwatch.
If variable voltage source has no built in voltmeter, a separate 0-300 V ac voltmeter may be
connected across any two output lines of the three phase voltage source.
See Figure 5-29. Connect the 3 phase 250 V ac variable voltage source at terminals 1,2, and 3 of
relay K111. Set multimeter to RX1 scale and connect across terminals 4 and 6 of the relay.