Electrical circuit arrangement for the protection of presses

Details Electrical circuit arrangement for the protection of presses Electrical circuit arrangement for the protection of presses

1985-01-31

1987-03-03

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318317, 318318, 318327, H02H 7093

Patent

active

046480030

ABSTRACT:
A protective circuit arrangement of a motor control for the starting and operation of a motor of a press with a power stage, a current-regulating element and a rotational speed regulating element. Comparator stages are connected to the inputs of the regulating elements for forming the guide magnitudes from the actual current value and the desired current value as well as from the actual rotational speed value and the desired rotational speed value. For suppressing the disconnect signal during the starting phase of the motor, the circuit additionally includes a rotational speed comparator stage, a desired current value memory and a current comparator stage. The desired current value, which stored after the starting phase in the desired current value memory, is compared with the current value in the current comparator stage to produce a motor current interrupt signal in case of an overload current that might lead to a press damage. As a result thereof, the damage is limited to the part responsible for the increased motor current.

REFERENCES:
patent: 3790874 (1974-02-01), Klimo
patent: 3931557 (1976-01-01), Osborn
patent: 3978381 (1976-08-01), Yamamoto et al.
patent: 4370690 (1983-01-01), Baker
patent: 4413213 (1983-11-01), Baumgarten, Jr.

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