Abnormally detecting device for relay

Details Abnormally detecting device for relay Abnormally detecting device for relay

1994-10-26

1996-10-22

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318280, 318254, 318138, 318439, 318434, 361 21, 361 30, 361 31, H02P 100

Patent

active

055680259

ABSTRACT:
There is disclosed a device for detecting an abnormality in relays which is adapted such that if there is a current flow through a motor (M) when first and second transistors (Q1, Q2) are off resulting from an abnormality such as melting of first and second motor driving relays (RL1, RL2), a controller (1) turns on the transistors (Q1, Q2) of a motor driving portion (2) in response to a detection signal from a signal detecting portion (3) and accordingly provides the same potential across the motor (M) to stop the motor (M) without a conventionally complicated, costly construction.

REFERENCES:
patent: 4145641 (1979-03-01), Ozaki
patent: 4300085 (1981-11-01), Monma et al.
patent: 4972129 (1990-11-01), Kawai et al.
patent: 5012165 (1991-04-01), Lautzenhiser et al.
patent: 5065079 (1991-11-01), Ogasawara
patent: 5136221 (1992-08-01), Takizawa et al.
patent: 5160875 (1992-11-01), Kono
patent: 5229695 (1993-07-01), Tsuda et al.

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