Model LXi-1800 is a combined automatic and manual wye-delta reduced current fire pump controllers applied where the capacity of the power source does not permit across-the-line starting of the motor. The controllers are used with six (6) or twelve (12) lead squirrel cage motors designed for wye-delta starting.

The motor is started connected in wye, drawing approximately 33% of the locked rotor current and producing approx. 33% of its locked rotor torque. After a short time delay, the controller transitions the motor to the delta connection. The motor current & torque jump to the across-the-line current & torque at the speed at which the transition takes place. The current quickly falls to its normal running current as the motor accelerates to full speed.