WHEEL DRIVE SYSTEM 65Service Manual – Advenger, 2800ST, 3800ST, BR 755, BR 855
WHEEL DRIVE SYSTEM
The drive wheel assembly is directly connected to the Curtis 1228 speed control, which not only provides an output signal of 24V to the drive wheel
for forward and reverse movement, but also monitors current and temperature, and controls the electromagnetic brake. It is the same for both the
Advenger / BR 755, 855 and ST models. The speed control is programmable through, and can be monitored via, the Curtis Handheld Programmer
56409441 and Curtis Adapter Cable with Quad Plug 56409823, listed in the recommended “Diagnostic and Service Tools” section of this manual.
For information on how to use the Curtis programmer, please refer to the Curtis Programmer Manual 56043101.
The 5k Ohm throttle pot R1 in the foot pedal controls drive speed and forward/reverse movement. The throttle pot input to the main control board
also determines whether or not the scrub and vacuum systems will engage, and is therefore critical to machine performance. If the control board
senses a Neutral position of the foot pedal, it will not engage these other systems unless placed in Service Test Mode or one of the vacuuming-only
modes.
The Electromagnetic Brake is engaged whenever the foot pedal is in Neutral, and released for forward or reverse motion.
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