JPS6174289U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing an embodiment of a motor restart circuit according to the present invention, and FIG. 2 is a wiring diagram showing a conventional example of a motor restart circuit. 2...Power supply, 4...Circuit breaker, 4a...Main contact of the breaker, 4b...A contact of the breaker, 4d...Turning coil, 4e...Stopping coil, 7...Electric motor, 8...Power failure detection relay, 8a...Detection b Contact, 13...Operation circuit, 1
4... Abnormality detection circuit, 15... Time limit circuit, 16... Operation switch, 16a, 18a... Starting contact, 16b,
18b...stop contact, 19...detection auxiliary relay, 19
a, 19c...Detection auxiliary A contact, 19b...Detection auxiliary B contact, 23...Power failure memory relay, 23a...Memory a
Contact, 24...Timer, 24a...Re-close contact, 25
...Reset switch.

Claims (1)

[Scope of utility model registration request] A restart circuit for a motor that opens the main contact when a power supply that is running a motor that is supplied with power through a main contact temporarily loses power, and when the power is restored, turns on the main contact again after a predetermined period of time to start the motor. ; a circuit breaker having the main contact, a circuit breaker A contact, a closing coil, and a stopping coil; an operating switch having a starting contact connected in series to the closing coil; and a stopping contact connected in series to the stopping coil; , an operation circuit in which a restart contact is connected in parallel to the start contact, and a detection auxiliary A contact is connected in parallel to the stop contact;
A power failure detection relay that has a detection b contact and is released when the voltage of the power supply decreases, and has the detection auxiliary a contact, another detection auxiliary a contact, and detection auxiliary b contact, and is connected in series with the detection b contact. Abnormality detection circuit equipped with a detection auxiliary relay; a power failure memory relay having a memory A contact and connected in series with the detection auxiliary A contact, the circuit breaker A contact, and a reset switch; a power failure memory relay having the re-close contact and the memory A A timer is connected in series with the contact and the detection auxiliary B contact, and a bridge is provided between the connection point between the circuit breaker A contact and the reset switch and the connection point between the memory A contact and the detection auxiliary B contact. What is claimed is: 1. A restart circuit for an electric motor, comprising a time limit circuit connected to the circuit; the operating circuit, the abnormality detection circuit, and the time limit circuit are each connected to a control power source.