Luketrician
Senior Member
- Location
- West Pawtucket
Hello everyone, I have been troubleshooting a lighting control problem today and could use some advice.
Asco 920 RC Lighting contactor feeding our switchyard lights, 120/208. The control circut is 48vdc, with two dc relays (for open and close signal) operated by a photocell.
The 'close' relay is not picking up. It is getting the 48vdc signal to one side of the coil, but I loose the common on the other side. From what I can tell the common for both relays go through the auxillary contacts on the 920. I am thinking that this is where the problem is, maybe someone wired the auxillaries backwards?
This 920 was just installed a month ago, not by me..but I don't think it has worked since it was put in. Now I am just trying to pinpoint the problem.
When put in manual operation the 920 works fine..opens and closes. Photocell circuit is sending the correct signal voltage for both Open and Close relays when in auto...and the close relay recieves the 48v on one side of the coil..but the common isn't there to complete the circuit
Hope ya'll can make sense of this and steer me in the right direction...
Asco 920 RC Lighting contactor feeding our switchyard lights, 120/208. The control circut is 48vdc, with two dc relays (for open and close signal) operated by a photocell.
The 'close' relay is not picking up. It is getting the 48vdc signal to one side of the coil, but I loose the common on the other side. From what I can tell the common for both relays go through the auxillary contacts on the 920. I am thinking that this is where the problem is, maybe someone wired the auxillaries backwards?
This 920 was just installed a month ago, not by me..but I don't think it has worked since it was put in. Now I am just trying to pinpoint the problem.
When put in manual operation the 920 works fine..opens and closes. Photocell circuit is sending the correct signal voltage for both Open and Close relays when in auto...and the close relay recieves the 48v on one side of the coil..but the common isn't there to complete the circuit
Hope ya'll can make sense of this and steer me in the right direction...