[M.RISHIKESH]

Dear All

V have got a controller which generates overcurrent alarm

We need to know which IC monitors current in the loop and generates overcurrent alarm

This PCB has got following ICs viz SN75173N, 75172N, 75C188,9829,75C189A,TDKT ZJYS4

Will it be possible to tell which of the above ICs is to monitor current and generate error in case of overcurrent as v need to locate that IC and replace because physical conditions r ok and no error comes after replacing PCB with new one that means overcurrent detector is only faulty

Regards,

M. Rishikesh

[Al_The_Man]

What controller?
I assume you mean a servo drive of some sort?
If so the over current usually comes internally from current detection in the drive output components.
There is also a case where the main controller indicates the fault and this could receive a digital input from a drive O.C. output in order to register a readable alarm on a screen.
Al.

[M.RISHIKESH]

Sir

Actually it is a CNC Controller not Servo (Sorry i did not mention it earlier)
Will it be possible for u to tell if any of these ICs viz SN75173N, 75172N, 75C188,9829,75C189A,TDKT ZJYS4 actually detect current and may be they have gone bad, due to which we are getting detect error although physical conditions r not as such because just after replacing this CNC PCB with OK one, we r thro with the problem

Regards,

M. Rishikesh

[Al_The_Man]

If it is the controller giving the alarm then I would assume it is getting it from a drive or? if so what I would attempt first is to try and find out/trace the input into the controller and reverse engineer from there by tracing back to which IC is receiving the input?
Al.