G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/08 (2006.01) H01H 47/00 (2006.01) H01H 71/00 (2006.01) H02H 3/16 (2006.01)
Patent
CA 2173803
A ground fault detection circuit monitors an interlock control circuit for use with a machine or process control system. The interlock control system utilizes electromechanical relays with hard contacts. The interlock control system will disable operation of the machine or process if any ground fault condition exists in the interlock control circuit. A ground condition in the machine or process control circuits is permissible. The system uses a redundant circuit path to verify the integrity of the components in the interlock control system. The control system includes an ungrounded isolation transformer for supplying power to separate monitoring relays interposed between each leg of the transformer and ground. The contacts of these relays are series connected with emergency-stop (e-stop) switches to energize interposing control relays. The outputs of the interposing relays are used to energize the final control relay that controls the operation of the machine or process. If a ground fault occurs, the particular monitoring relay will deenergize and the interposing control relays will also deenergize, causing the machine or process to be disabled. A reset circuit prevents continued operation of the control system as long as the ground fault condition exists.
Fetherstonhaugh & Co.
Square D. Company
LandOfFree
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