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Forums13
Topics7,385
Posts40,939
Members10,040
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Most Online3,137
Apr 9th, 2026
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Joined: Nov 2016
Posts: 2
stranger
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stranger
Joined: Nov 2016
Posts: 2 |
I have a 311 gem with a drive flashing !B1A
Also the fault on my service tool says precharge dc low
Can’t find what this means can someone help
Thanks
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Joined: Apr 2014
Posts: 280
Engineer
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Engineer
Joined: Apr 2014
Posts: 280 |
After a full power down and reset of the MCSS, does the fault still exist?
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Joined: Oct 2012
Posts: 262
enthusiast
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enthusiast
Joined: Oct 2012
Posts: 262 |
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Joined: Dec 2015
Posts: 1,766 Likes: 11
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,766 Likes: 11 |
Most AC drives charge the DC buss through a resistance of some sort until it reaches a set voltage where the resistance is bypassed to fully charge the buss. Otis calls this precharge and once the parameter M1 pick V PU is reached, the M1 contactors in the drive picks to bypass the resistor and charge the buss all the way.
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Joined: Aug 2022
Posts: 1
stranger
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stranger
Joined: Aug 2022
Posts: 1 |
Currently dealing with this same issue. I replaced the 4 capacitors as a starting point but to no avail. Any tips?
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Joined: Dec 2015
Posts: 1,766 Likes: 11
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,766 Likes: 11 |
The drive needs to be sent out for repair.
Last edited by Indirtwetrust; 08/27/22 12:35 AM.
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Joined: Feb 2015
Posts: 81
journeyman
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journeyman
Joined: Feb 2015
Posts: 81 |
I can get these rebuilt. PM me with pics of data tag for quote.
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Joined: Apr 2010
Posts: 220
bangyourheadhere
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bangyourheadhere
Joined: Apr 2010
Posts: 220 |
Access electronics out of Waldorf MD does a good job on these. I have replaced several of these over the years.
301 -645-1733
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Joined: Sep 2022
Posts: 1
stranger
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stranger
Joined: Sep 2022
Posts: 1 |
!B1A
i need your help to solve this problem
There are almost no parts left on the power floor that we haven't replaced, but the fault continues.
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HW PM
by Chris, January 13
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