Motor protector relay with memory of overload

Details Motor protector relay with memory of overload Motor protector relay with memory of overload

1982-09-30

1985-04-02

Goldberg, E. A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 31, 361 94, H02H 308

Patent

active

045090882

ABSTRACT:
A motor controller receives a signal proportional to motor current, integrates that signal during the high currents associated with starting, and holds a level during normal operation at speed within a maximum current limit. When an overload causes the motor to trip and there is a loss of power to the controller, a memory holds the level for a predetermined time to prevent an immediate restart of the motor.

REFERENCES:
patent: 3602771 (1971-08-01), Walstad et al.
patent: 4180842 (1979-12-01), Keeney
patent: 4345288 (1982-08-01), Kampf et al.

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