Technical FAQs

Ask a Question

What are possible causes for nSt?

Issue:
What are possible causes for nSt on the Altivar drives?

Product Line:
Altivar ATV Drive line

Environment:
All

Cause:
Drive will not run.

Resolution:
NST is a drive freewheel state its not a fault.  If the drive is in an NST state you can not run the drive in local or remote.
1:) 3 wire control:  check to see if NC stop on LI1 is open to +24vdc.
2:) 2 wire control:  check to see if the 2 wire type is level control or check to see if there is a run command on LI1 during power up.
3:) NST assigned as an logic input and that input is open.
4:) Stop button has been pushed on the local face or remote HMI and the drive is being commanded in terminal mode. 
5:) Drive is an CIA402 (DSP402) drive com NET command mode and is not received the proper commands to go to the RDY or RUN state.




 
Was this helpful?
What can we do to improve the information ?