Quote Originally Posted by john swift View Post
just had a look at the 2DM860H and the power supply terminals are marked as AC input
(the 2DM860 appears to be a version of the 2DM860H with a DC supply input )

your diagram shows the power supply as a DC supply

check the relay can break the DC supply current

otherwise you may find the DC current either burns the contacts due to the arc jumping across the contacts or welds them closed

( the arc when a switch breaks an AC current will be extinguished as the mains voltage drops to zero 100 times per second )

usually switching the DC supply to a stepper driver it is not recommended your likely to damage the driver(s)
I expect the drivers with an AC supply input will have a smoothing capacitor after the bridge rectifier that's large enough to absorb the back EMF when a DC supply is disconnected



John
Hmm....so should I use a contactor instead of a relay and if thats the case should I also put it on the 240v a.c. side instead of the 70vdc? Does the safety relay wiring look right from the charge pump output? Oh and one last thing....are the alarm outputs for the drive NC or NO? I had a look in the data sheet but couldn't work it out??
Cheers,
Charlie.

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