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6. Perform an electrical calibration test in accordance with Section 3.2.2. If the
relay passes the In-service/Field Calibration requirements apply glyptal to the
exposed threads of the counterweight screw and trunnion locknut, as shown in
Figure 3-6.
7. Install gaskets and covers and seal with a new wire and lead seal.
Figure 3-6. Inspecting Loose Counterweights and Loose Trunnion Screw
3.7.6. Test for Balanced Magnetic Circuit
With the relay standing on its back so that the vane hangs down with front and back
contacts open, apply normal voltage and frequency to the local winding. There should
not be any appreciable movement of the vane, particularly no tendency to close the
front contacts.
Copyright 2019
Locknuts
SM 4574F, Rev. 4, March 2019
PV-250 Track Relay
3-18
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