Model LXi-1700 is a combined automatic and
manual part winding fire pump controller, applied where the capacity of
the power source does not permit full voltage starting of the motor. The
controller is used with special six (6) lead squirrel cage motors designed
for part winding starting. These motors have two parallel stator windings.
The motor is started with one winding connected to the line. This winding
typically develops approximately 65% of its normal inrush current and 42% of its
normal starting torque. After a time delay, the second winding is
connected to the line in parallel with the first winding. Then the motor
will develop its normal running current and rated torque.
Note: Some motors may not have enough torque to turn the motor on the start