Replacement. Remove relay (78, figure 5-1,
sheet 2) by disconnecting and tagging wires and
removing four screws (77).
Reverse Power Sensing Relay K112 (67, figure
Check relay K112 fuse prior to
performing the following tests.
Polarity and Reverse Power Circuit Test.
potentiometer is set fully clockwise
before starting this test.
Connect a 0 to 1.2 amp, 0.05V AC
maximum, power source to terminals 1 and
2 (see figure 5-11). Connect a 115V AC, 60
Hz source to terminals 6 and 7. Connect an
ohmmeter to terminals 4 and 5.
(terminals 1 and 2) to 1 amp.
If the contact between terminals 3 and 5
closes, then the polarity is incorrect and the
wires on terminals 6 and 7 must be
reversed, and the test must be started over.
Push the Press-to-test Button. The contact
between terminals 3 and 5 must close at
Inverse Time Trip Curves Test.
Set the current source
Figure 5-8. Phase Sequence Relay K103, Test Setup