Technical FAQs

Ask a Question

What would cause the line isolation contactor to pull in when you power up the ATS48 soft starter?

Issue:
What would cause the line isolation contactor to pull in when you power up the ATS48 soft starter?

Product Line:
Altistat ATS48 soft starters or 48U enclosed

Environment:
All

Cause:
Line contactor is pulling when you first power up the ATS48 soft starter.

Resolution:
The R1 relay (R1A and R1C) is a dry contact, and normally controls the isolation contactor control circuit.  If R1 is programmed for fault, the R1 relay will close or energize when you apply control voltage to CL1 CL2.
If R1 is programmed for isolation, the R1 relay will close only after you get the soft starter a run command.

To check the programming:
  1. Power up the drive
  2. Arrow down to IO ( inputs and outputs) menu  ENTER
  3. Arrow down to r1 ENTER 
  4. R1F= fault, R1I= isolation 
Was this helpful?
What can we do to improve the information ?