Video: How to perform a diagnostic check on input and output side of an ATV61/71 drive?

FA173615

18 November 2021

Issue:
Checking input diodes and output IGBTs on ATV61/71 drives.

Product line:
Altivar 61 & Altivar 71

Environment:
All models, all serial numbers 

Cause:
Drive has faulted. Customer wants to do a full diode and IGBT check on the drive to see if it is functional.

Resolution:

Warning: This test needs to be done with the power off to the drive and the DC bus discharged.

Sizes 25HP and below

Check input:
Using a digital Fluke multimeter or similar meter set to the diode scale. Measure from L1, L2, L3 to PO. Your meter should read 0.3 to 0.7 V in the forward bias direction and 'OL' in the reverse bias direction.
Using the meter in diode scale, measure from L1, L2, L3 to PC/-. Your meter should read 0.3 to 0.7 V in the forward bias direction and 'OL' in the reverse bias direction. 

Check output:
Measure the output terminals the same way. Be sure your meter is set to diode scale and measure from T1, T2, T3 to PA/+. You should read 0.3 to 0.7v in the forward bias direction and 'OL' in the reverse bias direction. 
Measure T1, T2, T3 to the PC/- terminal. Your meter should read 0.3 to 0.7v in the forward direction and 'OL' in the reverse direction.



On 30HP and above sizes

Check input:

Using the meter in Ohm scale, measure from L1, L2, L3 to PO. Your meter will read 40k Ohms or higher in both forward and reverse direction.
Put your meter in the diode scale and measure from L1, L2, L3 to PC/-. Your meter should read 0.3 to 0.7v in the forward bias direction and 'OL' in the reverse bias

Check Output:
Now check T1, T2 ,T3 to PA/+ in diode scale. Your meter should read 0.3 to 0.7v in the forward bias direction and 'OL' in the reverse direction.
Measure T1, T2, T3 to the PC/- terminal. Your meter should read 0.3 to 0.7v in the forward direction and 'OL' in the reverse direction.