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    Video: How to check the input and output diodes on ATV61/71 drives

    Issue:
    How do you check the 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 PA/+. 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:
    Now measure the output terminals the same way. Be sure your meter is set in diode scale and measure 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/- terminals. Your meter should read 0.3 to 0.7v in the forward direction and 'OL' in the reverse direction.



    On 30HP and above sizes
    Using the meter in Ohm scale, check L1, L2, L3 to PA/+ you will read 40k Ohms or higher in both forward and reverse direction.
    Put your meter in the diode scale and 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
    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.

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