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IndustryArena Forum > MetalWorking Machines > Fadal > Fadal dual arm tool changer, low voltage at turret motor?
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  1. #1
    Join Date
    Oct 2007
    Posts
    3

    Fadal dual arm tool changer, low voltage at turret motor?

    Hello

    This is a 2007 Fadal 4020. Machine had increasing difficulties related to the turret motor of the dual arm tool changer. The issue was somewhat intermittent with the turret motor making a loud buzzing sound, which sounds like an alarm buzzer. One day it stopped working completely.

    The turret motor was replaced.

    The new motor doesn't move when tool turret indexing is activated, and after 10-15 seconds, the overload on the relay trips. Motor gets warm. We measure voltage at the motor when turret index is commanded, and get 230v - 115v - 115v leg to leg.

    At this point I believe we are single phasing the turret motor and the low voltage is regen from the energized coil, so it must be a fault in the motor start relay located on the "1330-1D" card labeled PCB-0317 rev C, Fadal 2006. Relay is an ABB VB6-30-10-84. I check output of the relay. 230v leg to leg. No fault.

    So, the next troubleshooting step taken was to unplug the turret motor connector J9 on the "1330-1D" card and measure the output at the pins. When turret indexing is commanded, these pins read 230v - 115v - 115v leg to leg. Pin 1 to ground is 133v, pin 2 to ground is 133v, pin 3 to ground is 68v.

    Power at the motor start relay is fine, power routes through board, output of board is somehow half voltage?

    Any idea what I might be missing? is it just dropping a leg of three phase and I'm seeing 68V or 115V due to regeneration from the energized leg? or should I look for voltage drop across a relay?

    Thanks..

  2. #2
    Join Date
    Oct 2007
    Posts
    3

    Re: Fadal dual arm tool changer, low voltage at turret motor?

    Problem was a loose wire on one of the motor start relays. Tugging on the wires individually detected the fault. Problem resolved.

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