Motor heating control with interlocked dual isolating switches

Details Motor heating control with interlocked dual isolating switches Motor heating control with interlocked dual isolating switches

1981-07-23

1982-10-19

Weldon, Ulysses

Electricity: motive power systems

Nonrunning, energized motor

361339, H02P 700

Patent

active

043552692

ABSTRACT:
A motor heating control for retrofit applications has an enclosure with power supply terminals and motor heating output terminals. Inside an upper compartment is a first two-pole isolating switch which couples power from the supply terminals through a step-down transformer and a rectifier to one side of a motor heating contactor in the lower compartment. The other side of the motor heater contactor is coupled through fuses and a second two-pole isolating switch in the lower compartment to the motor heating output terminals. An operating handle outside the lower compartment is mechanically interlocked to both isolating switches so that the door of the enclosure cannot be opened without disconnecting both the motor heating power source and the electrical motor from the motor heating control. The motor heating contactor is also electromechanically interlocked to the door interlock mechanism so that the operating handle cannot be moved to its open position until the motor heating contacts are opened. When the motor heating contacts are closed, current will be supplied to at least one motor winding to maintain a temperature of 5.degree.-10.degree. F. above the ambient and prevent condensation in the windings of a motor.

REFERENCES:
patent: 2338518 (1944-01-01), Koch
patent: 3445743 (1969-06-01), Blair
patent: 3582712 (1971-06-01), Blair
patent: 3717804 (1973-02-01), Dikinis et al.
patent: 3774096 (1973-11-01), Hann
patent: 3896353 (1975-07-01), Burton et al.
patent: 4195324 (1980-03-01), Waltz
Bulletin 1500 Instructions, Allen-Bradley Co. Publication 1500-5.0 - Sep. 1976.

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