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The PM has the following safety and protection features:
Detection of open circuit motors;
Detection of open or short circuit Park Brakes;
Battery under voltage protection with Battery Saver to prevent motor
chugging and to protect battery;
Thermal overload protection with progressive motor current roll back and
automatic recovery;
Over voltage shut down (protect outputs against damage if disconnected
battery; eg. while wheelchair is driving downhill, ie. motors generating);
Enhanced downhill control providing a smooth, controlled rollback of speed
should the battery voltage rise too high;
All outputs protected against over voltage transients and short circuits;
Isolate relay protects against reverse battery connections and prevents
runaway in event of H Bridge or Park Brake driver failure;
Detection of welded isolate relay contacts;
Detection of high resistance isolate relay contacts;
Dynamic braking in neutral;
Motor drive output monitoring;
Microcomputer watchdog protection;
Optional stalled motor time out;
Self test of current sensor and H Bridge at power up;
Hardware kill signal from DX Remote to prevent driving;
Watchdog, CPU, ROM and RAM testing at power up.
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