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Thread: AB 1388 OV fault

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  1. 07-30-2014, 08:55 PM #1
    ScotGlover
    ScotGlover is offline Registered
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    AB 1388 OV fault

    I am working on a Star grinder. 6 axis machine. Runs OK, but I get a OV fault on the servo drive if I run higher than 80%. I know it's an "overvoltage" fault. I'm wondering if I can adjust the decel time on these drives. Allen Bradley 1388. The only thing I can find in the manual is a Velocity Gain potentiometer to adjust the dynamic gain of the drive. That doesn't seem to have any effect.
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  2. 08-16-2014, 02:18 AM #2
    Larken
    Larken is offline Member
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    Re: AB 1388 OV fault

    Is this an AC powered drive, or run off a common DC buss ? Can you monitor the DC bus with a voltmeter
    Is there a braking resistor circuit on the machine ?

    If the drives are old, capacitors can dry up and cause bus problems.
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