发明名称 |
Elevator door control system |
摘要 |
A feedback controlled elevator door control system 30 having motoring and generating modes, including a DC motor 35 connected to a DC power supply 36 via a power bridge circuit 68. Protective features include a dynamic current limit reference 200 having a magnitude which changes with motor speed; control 116 for providing an object detection safety-stop speed pattern having parameters which are selectable independent of the door stopping portions of normal opening and closing speed patterns; a bridge monitor 66 which prevents the changing of door commands when motor reversal could cause a bridge short; a power supply monitor 40 which blocks door commands when the control voltage is below standard; and an over-voltage protection monitor 38 which protects against excessive voltage build-up on DC power supply components when the bridge circuit 68 pumps power back to the DC power supply 36 during a generating mode.
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申请公布号 |
US4776433(A) |
申请公布日期 |
1988.10.11 |
申请号 |
US19880148394 |
申请日期 |
1988.01.25 |
申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
LAGREE, JAMES L.;JOHNSON, RICHARD A.;BOOMGAARD, DIRK J.;D'ZURKO, DAPHNE C. |
分类号 |
B66B13/26;G05D3/00;(IPC1-7):B66B13/08 |
主分类号 |
B66B13/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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