DavidG (Customer) asked a question.
What do K3 and K4 represent on this diagram and how are they wired both in series with the estop and also on the load side in this example circuit? If i am trying to use the LG5924.48/62 to control higher current draws of an electric heater do I need to use a contactor that has multiple NC auxiliary contacts?
TIA
K3 and K4 are auxiliary contacts on external safety contactors. k3 and K4 on the bottom end are the coils of these contactors. They are designed to prevent the safety relay from resetting in the event that one of the contactors gets stuck closed. The aux contacts are mechanically linked to their internal power contacts which would prevent them from closing in that event.
I would research the difference between safety and regular contactors if you're not familiar. They are operationally similar but have differences. One of the main ones is that the aux contacts cannot be removed from the contactor like they can on a standard contactor.
P.S. You only need one NC aux contact per contactor.
So the LG5924.48 would need to be paired with something like this?
I guess the idea is that by switching both legs of a circuit, the contacts will wear similarly but are unlikely to weld close on the same actuation so if/when one side welds, it locks up the system until its replaced?
Not necessarily a need if your loads are 5-amps or less at the rated voltage; you can power your loads from 14, 24 and 34 when power is coming in from 13, 23 and 33.
If your loads are greater than 5-amps, then a safety contactor will need to be used and the wiring example provided will maintain the safety rating of the Estop module.
Unfortunately the load is 12A so I will need to use a contactor.
This brings me back to my original question: If i am using the contactor i linked (Dold CWBS25-33-30C03, pictured below) how do I put K3 and K4 in in series with both the enable loop (Y1 to Y2) but also in series with the main contacts as shown in the sample wiring diagram (pictured further below)
The example diagram is if your application need two separate circuits/contactors. If your needs are just using one contactor, wire the coil as shown as K3 to terminal 14, and your N.C. of the contactor would wire in series from the ON pushbutton to Y2.
To make sure I understand how the system works, I made a test version on a 2x8 I had laying around. Here's what I put together, described in excruciating detail to make sure I'm not missing or mixed up about anything:
Is that correct?
TIA
The example diagram is if your application need two separate circuits/contactors. If your needs are just using one contactor, wire the coil as shown as K3 to terminal 14, and your N.C. of the contactor would wire in series from the ON pushbutton to Y2.