nogard1126
Member
- Location
- WI
I always wondered why the overload relay contact is placed after the contactor coil in the control circuit. Does it really matter, as long as it is in the circuit to open the rung?
Also on the actual overload (heaters), why are they always placed after the contactor just before the motor. Could they be put anywhere in the circuit as well?
I have a basic motor control circuit. It is 120VAC into a rheostat with a transformer, then into a bridge rectifier, then 160VDC to the DC motor. Does it matter if the overload heaters are placed in AC part of the circuit before the rheostat or on the DC motor leads?
I am using a three phase contactor/overload. I am using the looping/series method of wiring by going into the top of phase 1 out the bottom to phase 2 out the top to phase 3 then out the bottom of 3 to the motor.
Thanks.
Also on the actual overload (heaters), why are they always placed after the contactor just before the motor. Could they be put anywhere in the circuit as well?
I have a basic motor control circuit. It is 120VAC into a rheostat with a transformer, then into a bridge rectifier, then 160VDC to the DC motor. Does it matter if the overload heaters are placed in AC part of the circuit before the rheostat or on the DC motor leads?
I am using a three phase contactor/overload. I am using the looping/series method of wiring by going into the top of phase 1 out the bottom to phase 2 out the top to phase 3 then out the bottom of 3 to the motor.
Thanks.