denny
Junior Member
Posts: 99 
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Post by denny on Aug 1, 2017 19:41:04 GMT
I just had another left Blade Motor Controller (BMC) failure. This is the third one in less than four months. They ship, I change them out. The Raven starts running rough and surging. I usually get it shut down quickly, wait a minute or two and start back up, all is normal for 20-30 minutes then acts up again. The BMC's usually fail after one or more of these episodes. Happened on my original unit, happens as this replacement unit. Same (original) deck. I read somewhere on this forum that similar issues were resolved by replacing the blade motors. Over voltage sensing motors? Safety shutdown? Any info? They have scheduled a service tech that will be here sometime this month. Will see if he will explain. They did send a carburetor I requested but have not replaced it yet.
Anyway, I asked Kita about the BMC's failing, she said they were aware of the issue and are sending a "modified" BMC. One day at a time.
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kb
New Member
Posts: 8
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Post by kb on Aug 23, 2017 17:44:15 GMT
So far, including the components currently mounted on the unit, I have 2 complete decks, 8 blade motors, 8 blade motor controllers, 2 racks for the steering, 2 sets of fuses, and 2 48 volt battery packs. This morning the left blade quit working - again - The generator and drive portions of the unit have worked fine since the first motor replacement. Unfortunately when I replaced the blade motors and blade motor controllers I didn't mark which ones were mounted on the right side or I might be able to plug and play.
I was wondering if anyone has a wiring schematic/diagram for unit, specifically for the blade motors and blade motor controllers. I assume the controllers are there to monitor the output of the generator and to provide the safety features for the unit. If the left controller issue persists from here on I may wire around the controllers straight to the motors and put a manual on/off switch on it. But I need to know the voltage at the input side of the blade motors as well as which are the power leads.
I realize that this will eliminate the safety issues for mowing in reverse. If I puit the operator presence switch in the loop that portion of the safety will remain.
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kb
New Member
Posts: 8
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Post by kb on Aug 23, 2017 17:49:22 GMT
The first time I replaced the motors I had a similar problem with the unit just shutting off completely. Raven sent me a new battery pack which didn't work then a new set of fuses which didn't work Then a new set of blade motor controllers which didn't work. Finally they let me speak to one of their techs who told me the problem was with an over voltage sensor in the motor. When the sensor goes bad it incorrectly reads an over voltage condition from the generator and shuts the whole thing down. Replacing the blade motors fixed that problem.
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