DECKMASTER
5.0
ELECTRICAL SYSTEM
5.1
460 VAC/3-Phase/60 Hz Operation
The NEMA-4X enclosure on the Hydraulic Power Package contains all electrical controls for the Drinking Water
Discharge Winch System. The electrical schematic of the system is presented in Figure 5-1 on page 5-3 *. Input power,
p 460 VAC/3-phase/60 Hz, is supplied to the contactors for the oil heater and electric motor, and two legs of the input
power are tapped through a transformer to provide control power, 120 VAC, single phase. The outside configuration of
the NEMA-4X enclosure is presented in Figure 5-2. The immersion oil heater (Item #13) in the reservoir is controlled by
the rotary switch on the outside of the enclosure and the automatic control. A red indicator light is illuminated when the
heater is in operation. The level/temperature switch (Item #12) in the reservoir is used to shut down the system in the
event of excessively high or low oil temperature or low oil level (level sensor is located at the mid elevation of the
reservoir). The heater contactor will automatically open if any one of the four conditions exist:
1) - Low oil level (level switch open)
2) - High oil temperature (high temperature switch open above 180° F)
3) - Thermostat open (set for 100° F)
4) - Manual rotary switch turned OFF by operator.
The electric motor can be started and stopped by the operator using the push buttons on the outside of the
enclosure. The automatic control will open the motor contactor if any one of five conditions exist:
5-1 *
