maintained over the entire range of loading. In the event that power factor is not maintained at low
loading, perform the following steps.
a) Reduce kW loading to about 20% of rated load.
b) Adjust the Balance control until the system instrumentation indicates the desired power factor has
been obtained.
MOTOR APPLICATIONS
The following procedures contain instructions for preliminary adjustment of the SCP 250 in motor
applications.
CAUTION
Avoid establishing a lagging power factor so low as to cause the motor to pull out
of synchronization.
Avoid establishing a leading power factor so high as to cause field overheating.
Appropriate protective devices should be considered to remove field excitation in
the event a pull-out condition occurs.
Preliminary Adjustments for Power Factor Control
1. Adjust the Balance control to the midrange position.
2. Adjust the VAR Range control to the midrange position.
3. Adjust the Output Limit control to the midrange position.
4. Place the Mode switch in the Power Factor position and adjust the Var/Power Factor Adjust control to
the desired power factor.
5. Connect a jumper across terminals J and K.
6. Start the motor.
7. Vary the voltage regulator’s voltage adjust control until the motor power factor is at the desired value.
8. Remove the jumper from terminals J and K. Carefully monitor field current and/or voltage to assure
proper phasing. Control of power factor is now directly obtained using the Var/Power Factor Adjust
control.
911000099Y Rev T SCP 250 Operation 5-3
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