DH9116 Motor Overload Protection System (MOPS) Bypass - RC Groups
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This thread is privately moderated by Ribble, who may elect to delete unwanted replies.
Aug 07, 2012, 01:20 PM
Crash and learn

DH9116 Motor Overload Protection System (MOPS) Bypass

Solder bridge the Motor Overload Protection System (MOPS). Suggest scraping some green enamel and splash solder across, right below the two MOPS leads (white line between leads). This grounds the source leads on the two motor FETs (like on the DH9104) Do not remove the MOPS orange loop.

You can put a wire jumper across the MOPS connections, but you stand a chance of ruining those connections, which are critical. So create a solder bridge below the connections. The solder bridge will have some resistance and there will remain some minor motor protection. To later undo the solder bridge, move the soldering iron down the gap between the enameled copper.


9116-PCB-Bottom 9116-PCB-Bottom

MOPS leads - Scrape green enamel below and solder bridge
>I've put on a solder bridge and that solved the problem. I can now spool up to full power without any cut-out affect.
>It was recommended only to do this with the stock battery - my plan is to use a 900mah 20C (40C burst) battery.

Adding more battery mah with a battery that weighs the same as the stock battery does not add any additional workload. A higher "C" rating allows you to fly harder, though the average workload will still be about the same - unless you use the additional available power to fly straight up for a long time, or stall a motor by not turning throttle off upon crashing..

Adding more battery mah with a battery that weighs the same as the stock battery does allow flying longer with added risk of overheating the motor. The printed circuit board shouldn't care unless the motor fails.

In theory, a replacement printed circuit will do the same thing because the MOPS tolerances are pretty close for an overall production run. If anything, perhaps a bad solder connection on the MOPS leads, or an out of tolerance motor.

Solder connections on the MOPS leads are critical. Beyond that, battery connections and wires are critical to prevent a voltage drop with a resulting higher current. The B+ and B- solder connections to the printed circuit board are critical. ... It is possible that shorting the MOPS is masking another problem on the above.
Last edited by Ribble; Aug 07, 2012 at 01:34 PM.
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