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IndustryArena Forum > MetalWorking Machines > Okuma > Alarme 1151 MCS Exception processing #13

Thread: Alarme 1151 MCS Exception processing #13

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  1. 02-08-2011, 02:13 AM #1
    dr_alexy
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    Alarme 1151 MCS Exception processing #13

    Hi I have alarm on Okuma Ma-50HB OSP U-10. Each time when I try to start spindle, I got this alarm, I checked drive and replaced 3 IGBT modules because one was broken. I checked a motor of spindle: looks like “short ‘’on every outs (U-X, V-Y, W-Z).Does anybody know how ohms I should have on spindle motor leads 22kw? Sorry for my English.
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  2. 02-08-2011, 09:14 PM #2
    Algirdas
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    check Your drive unit thoroughly. Okuma motors are very rigid.
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  3. 02-08-2011, 10:31 PM #3
    underthetire
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    Sounds like a double wound motor. You need to check U<V<W to each other, and X<Y<Z together. Then check all to ground with a megaohmer. Then check the switching contactors, im sure it has them. Okuma motors rarely fail.
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  4. 02-08-2011, 11:51 PM #4
    dr_alexy
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    Checked contactor looks good, motor is not grounded. Unplug motor from drive - no alarm, only velocite alarm because of encoder. Any suggestions?
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