Dynamic DX Power Module PMB

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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.

Dynamic DX Power Module PMB - Page 11