Mechanical; Electrical; Servicing; Mechanical Adjustments - GE IJS52D Instructions Manual

GEI-90802
t·1ECHANI CAL
The mechanical checks described in the section on ACCEPTANCE TESTS should be
repea ted.
ELECTRICAL
Using the connections in Figure 8:
1. Check that the maximum closing angle for pickup of the synchronizing-check unit
agrees approximately with the value shown on the curve in Figure
11.
2. Check the closing time with the potentiometer set to provide rated voltage on
both circuits. The time should agree with the values given in Figure 6, ~ 10%.
Check the pickup and dropout of the telephone-type undervoltage units
(278
and
27L).
SERVICING
If
recalibration of the relay is necessary, the following should be considered when
making adjustments.
MECHANICAL ADJUSTMENTS
1. The moving contact should just touch the secondary contact when the time dial
is set at the zero (0) position.
If
readjustment is necessary, loosen the two
clamping screws which fasten the stop arm to the shaft and change the position
of the stop arm relative to the moving contact until the contacts just touch
with the time dial set at O. A fine adjustment can be obtained by moving the
stationary contact brush in or out by means of its adjusting screw. However,
in the final adjustment, the contact brush must be positioned so that there is
1/64" to 1/32" wipe with the contact fully closed. Be sure that the screws are
securely tightened after the adjustment is made.
2. The stop-arm leaf spring should deflect at least 1/64" when the synchronism-
check unit is de-energized.
3. The disk and shaft assembly should have a vertical end play of 1/16" to 1/32"
and both bearing screws should be tight. The disk should be approximately
centered between the poles of the U-magnet and drag magnet.
4. Telephone-type relay contact gaps may be adjusted by bending the stationary
contact brush to obtain 0.015 inch gap. When the adjustment is made, the wipe
must be rechecked to make sure there is a minimum of 0.005" wipe.
ELECTRICAL ADJUSTMENTS
Closing Angle Adjustment
Connect the relay as shown in Figure 10. To make an accurage adjustment of the
closing angle, a phase shifter and phase angle meter are required, along with a
means for voltage control.
9