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TRACKMASTER
Product Requirment
FVX, TMX Smart Power Supply
INTRODUCTION
The FVX, TMX Series treadmill control is to provide a means of controlling belt speed and
elevation for the FVX, TMX Series treadmill through the use of an RS-232 serial port and
established serial port protocol. A means of accepting an emergency stop input should be
incorporated. The treadmill control board should be electrically isolated from both the
elevation motor and inverter controlling the belt motor.
SCOPE
This requirements document only applies to the electronic control for the FVX, TMX Series.
The mechanical treadmill, elevation motor assembly, belt motor and inverter for motor
control are supplied by others. In addition, all connections to the smart power supply (SPS)
PCB are supplied by others.
OPERATIONAL OVERVIEW
When power is applied to the unit, the SPS takes a moment to read the contents of the non-
volatile memory and verify the calibration contents read with a checksum. If the contents are
valid, the unit enters operational mode with a set speed and set elevation of zero. Otherwise,
the constants are set to non-operational values and the unit is put into a non-calibrated state
where operation is suspended.
In operational mode, the unit continuously controls the belt speed output, the belt enable
output, and the outputs to raise or lower the elevation based on the current setpoints for speed
and elevation. Through the use of an RS-232 serial port, the unit accepts commands to
modify the belt state, the belt speed, and the deck elevation. The current state of the control
may also be queried through the use of this serial port. As commands are received to change
the setpoint speed or setpoint grade, they are checked for format and range then pending
approval, the new setpoints are adopted and adjustments are made to the state of the outputs.
Speed control is done in a closed loop that monitors the belt speed using a magnetic reed
switch located on the motor side of the belt pulley. A speed calibration is required to provide
a target speed output for a given setpoint, but after the initial target is reached, the speed input
is constantly monitored to make adjustments to the speed output and to detect over speed or
under speed fault conditions. In the case of a fault condition, the belt is stopped and
operation is suspended.
Elevation position control is done using relays to turn on the elevation motor in the up or
down direction depending on the current setpoint. A microswitch input is used to determine
the position of the elevation motor by counting revolutions of the elevation motor's internal
gearing. An elevation calibration is required to provide an accurate number of counts from
zero to full elevation. No closed loop control is done for positioning elevation.
Power may be removed from the unit by opening the normally closed switch connected to the
emergency stop input, or by removing AC power from the system. In both cases, the outputs
will be put into a non-energized state that will correspond to the belt being shut off and the
elevation motor being disengaged.
August, 2006
FVX, TMX Series Service Manual
9
9-1
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Troubleshooting
