Maintenance Man
Member
Hi to all
I have a question about wiring up industrial 3 phase motor starters. At this time I am taking a Mechtronics course at our local tech school in which they had us wire up a motor starter. The plant I work at wires motor over loads with extra protection by wiring the common control wire through the NC contacts on the overload then to A2 on the contactor. A1 of the contactor has the hot wire for 120v ac. The instructor told me that having the common go through the NC contacts on over load is not necessary. What I would like to know, is if wiring a neutral through the NC contacts on the overload to open the neutral, if the overload trips, is used in most industries as an extra protection or is this something that the company I work for is only doing? A maintenance supervisor told me they had some contacts weld together, which did not stop the motor, which damaged it so this was the reason for breaking the neutral going to A2 to stop the motor. Thank you for your help in this question.
Sincerely:
Maintenance Man.
I have a question about wiring up industrial 3 phase motor starters. At this time I am taking a Mechtronics course at our local tech school in which they had us wire up a motor starter. The plant I work at wires motor over loads with extra protection by wiring the common control wire through the NC contacts on the overload then to A2 on the contactor. A1 of the contactor has the hot wire for 120v ac. The instructor told me that having the common go through the NC contacts on over load is not necessary. What I would like to know, is if wiring a neutral through the NC contacts on the overload to open the neutral, if the overload trips, is used in most industries as an extra protection or is this something that the company I work for is only doing? A maintenance supervisor told me they had some contacts weld together, which did not stop the motor, which damaged it so this was the reason for breaking the neutral going to A2 to stop the motor. Thank you for your help in this question.
Sincerely:
Maintenance Man.