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No, it does not.this circuit causes delay of motor off by 1 second
No, it is not.this circuit is for a "3 WIRE CONTROL WITH UNDERVOLTAGE RESTART"
Shown here is typical factory pre-wiring of a typical magnetic motor starter in North America.Mr. Che said:c) In both circuit 1 and 2, the O/L N.C. contact placed between M coil terminal b and the grounded line is a violation of NEC/CSA. Reason: In case the M coil terminal b is grounded, the system remains running until the motor is burned out; even the O/L N.C. opens.
Low Voltage Protection: No Automatic Restart.Canadian Electrical Code said:(a) when automatic restarting is liable to create a hazard, the motor control device shall provide low-voltage
protection; or
(b) when it is necessary or desirable that a motor stop on failure or reduction of voltage and automatically
restart on return of voltage, the motor control device shall provide low-voltage release.
Is it working as intended?OP said:This is already implemented at the site for various 480/600vac motors, it is not a concept
Not how I'd design it said:Not how I'd design it, but I can see the momentary low voltage restart working if both M and CR drop out from the low voltage. CR contacts 1-4 will close allowing M to reenergize.