Title:
SYSTEM FOR DETECTING MELT-ADHESION OF RELAY
Document Type and Number:
WIPO Patent Application WO/1991/003741
Kind Code:
A1
Abstract:
A system for detecting melt-adhesion of relay to check melt-adhesion of relay contacts. Fully interlocked relays or half-interlocked relays are connected in a number of two to operate under the same conditions, and the melt-adhered condition is detected from a signal condition in which make contacts and break contacts of the two relays are connected in series. In the half-interlocked relays (R1, R2), if the coil is turned off under the condition where a make contact (r12) is melt-adhered as a result of flowing current to the coil, the other contact (r22) remains open or stays on the make contact side. Under the condition where the break contact (r11) is melt-adhered, the other contact (r21) remains open or stays on the break contact side when the relay coil is turned on. Therefore, half-interlocked relays are used in a number of two under the same conditions, and the make contacts and the break contacts of the relays are connected in series to check the two signals in order to detect melt-adhesion of relays. Melt-adhesion of the fully interlocked relays can be detected in the same manner, too.
Inventors:
HOSHINO YOSHINORI (JP)
Application Number:
PCT/JP1990/001095
Publication Date:
March 21, 1991
Filing Date:
August 29, 1990
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
G01R31/00; G01R31/327; G05B19/048; G05B19/05; H01H47/00; (IPC1-7): G01R31/00; H01H47/00
Foreign References:
| JPS544932Y2 | 1979-03-02 | |||
| JPS58148851U | 1983-10-06 | |||
| JPS5912625Y2 | 1984-04-16 |
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