GE CEX57D Instructions Manual page 9

Test connections for checking correct unit operation.
15 to 16 .
Control Spring Adjustment:
Be sure that the relay is level in its upright position.
connected as shown in Figure 128, and leave the restraint taps in the 100 percent
position. Put the basic reach taps in the 1. 5 ohm taps. With the voltage set for zero,
the current required to close the left contact should be as shown below:
Amperes to Close
Left Contact
Clutch Adjustment:
*
R emove jumpers from studs 13-14 and 15-16.
128, set the phase angle to 185 degrees (I leads V) for the top unit, or 5 degrees (I
leads V) f or the lower unit. Put restraint taps in 100 percent, basic reach taps in the
3. 0 ohm taps, and set for rated voltage.
slips. The current should be between 22 and 30 amps.
by observing the nut at the top of the rotating sha ft assembly. This nut will turn when
the clutch slips, but the moving contact will remain in contact with the right
stationary contact.
Ohmic R each
Connect the relay per Figure 128. Set the phase angle to maximum torque (I leads V
by five degrees if factory adjusted). With restraint taps on 100 percent, basic reach
taps on 1. 5 ohms, and V
the upper unit.
For the lower unit, repeat as above, except set the phase angle to 185 degrees (I
leads V).
Note that the mho units see a phase-to-phase fault of twice the basic minimum
reach for the test conditions.
To check the angle of maximum torque, again use the connections of Figure 128.
Set the phase shifter to maximum torque angle, plus 30 degrees.
the left contact should be 82 to 91 percent of the value determined in "Ohmic R each"
above.
Repeat the above check with the phase angle set for maximum torque angle, minus 30
degrees. The current to close the left contact should also be 82 to 91 percent of the
value determined in "Ohmic Reach. "
ELECTRICAL CHECKS - AUXILIARY UNIT (CEX57F ONLY)
Select the proper tap f or the DC voltage to be used on the relay.
* Indicates Revision
CEX570
1. 2-1. 5
= 30 volts, determine current to just close the left contact of
The current should be between 9. 7 and 10. 3 amperes.
GEK-49778
CEX57E
0. 85-1. 00
With the connections shown in Figure
Increase the current until the clutch just
The clutch slip can be detected
13
Jumper studs 13 to 14 and
Leave the relay
CEX57F
1. 2-1. 5
The current to close