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December 2nd, 2019, 01:54 PM
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#1 |
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Member
 
Join Date: Oct 2018
Location: Leesville
Posts: 81
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ABB ACS550 Earth Fault
I just replaced this drive as the old one went out when the plant had a power surge/flicker.
1-Installed the drive 2-Powered up 3- Got an immediate EARTH FAULT, so I check the manual and it talks about wires being grounded. 4- Disconnected wires from the motor and ohm out the wires to ground( CHECKS GOOD) 5-So I ohmed out the motor and I was getting 40-50 ohms when tested to ground.  6-I have not powered up the drive with out the wires disconnected. I will try that next to confirm my thoughts that the motor windings are starting to go bad and current is leaking out. Bad motor? |
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December 2nd, 2019, 02:06 PM
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#2 | |
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Lifetime Supporting Member
Join Date: Mar 2005
Location: ENE of Nowhere Oklahoma
Posts: 10,317
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Quote:
__________________
It's not all the variables I am most concerned with, it's the undiscovered constants. |
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December 2nd, 2019, 02:49 PM
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#3 |
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Member
Join Date: Oct 2018
Location: Leesville
Posts: 81
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Seperated motor from power booted drive up and no fault. looks like im searching for a motor. Thanks OkiePc
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December 2nd, 2019, 08:38 PM
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#4 |
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Member
Join Date: May 2006
Location: Northern California
Posts: 1,845
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VFDs are better at finding faults than a lot of other things that are supposed to...
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December 3rd, 2019, 08:02 AM
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#5 | |
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Lifetime Supporting Member
Join Date: Mar 2005
Location: ENE of Nowhere Oklahoma
Posts: 10,317
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Quote:
 That should read 10 megohms. I have seen motors on starters work as low as 2 Mohm. I once replaced an obsolete 1336 VFD with a Toshiba G7 and it wouldn't run. The motor megger test showed 80 Megohms to ground... The 1336 was fine with it, the G7 said nope.
__________________
It's not all the variables I am most concerned with, it's the undiscovered constants. |
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