Why might I get an NST on my ATV320 when I wire a relay to the digital output (DQ)?
Issue:
Getting NST on my ATV320 when wiring a relay to the digital output (DQ).
Product Line:
Altivar 320
Environment:
All
Cause:
NST on the ATV320 with relay connected
Resolution:
1. Check to make sure your relay is wired correctly in series with the digital output:
Getting NST on my ATV320 when wiring a relay to the digital output (DQ).
Product Line:
Altivar 320
Environment:
All
Cause:
NST on the ATV320 with relay connected
Resolution:
1. Check to make sure your relay is wired correctly in series with the digital output:
Jumper +24V to DQ+
Wire your + side of your relay coil to DQ-
Wire the other side of the coil to COM
Wire your + side of your relay coil to DQ-
Wire the other side of the coil to COM
2. Measure the amperage pull of your relay. The digital output and the drive's +24V supply each have a maximum 100mA capacity.
If your relay is pulling more than 100mA, it's pulling down the +24V in the drive and causing the NST.
See attachment.
See attachment.