Acceptance Tests; Installation Procedure - GE IJS51A Instructions Manual

Synchronism-check relays

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Table of Contents

Immediately upon receipt of the relay, an inspection and acceptance test should be

made to make sure that no damage has been sustained in shipment and that the relay

calibrations have not been disturbed.

readjustment is necessary, refer to the section on

VISUAL INSPECTION

Check the nameplate stamping to make sure that the Model Number and rating of the

relay agree with the requisition.

Remove the relay from its case and check that there are no broken or cracked molded

parts, or other signs of physical damage, and that all screws are tight.

Check that the short fingers are in the correct location, as indicated in Figure 9

and Figure 10, and that the auxiliary brushes are properly adjusted (see Figure 13).

MECHANICAL INSPECTION

Check that the rotating element moves without noticeable friction.

Remove the time-dial locking screws and check that the moving contact just

touches the stationary contact when the time dial is set at 0.

wipe should be approximately 1/32 1 1 •

Check that the control spring is not deformed, and that the spring convolutions

at No. 5 time-dial setting are reasonably concentric.

ELECTRICAL TESTS

Connect the relay as shown in Figure 11 and check the following:

Check that with at least 115 volts, 60 cycle single-phase source connected to

both operating coils the relay picks up with approximately the time delay shown

in Figure 8.

Check that the relay picks up at a

that is used) within � 30 when connected to a 115 volt, 60 cycle source with

rated voltage in both coils.

with the value in Figure 1 within ! 10 %.

With both coils connected to a 115 volt source with 0 displacement, check that

pickup time agrees with values given in Figures 5 or 6 ! 10%.

If after acceptance tests the relay is held in storage before shipment to the job

site, it is recommended that the visual and mechanical inspection described under

the section on