RUNRACE : Service & Maintenance Manual - rev. 2.0
Page 3.8
3.3. UP-DOWN MOTOR DRIVE
3.3.1. M
ECHANICS
The elevation of the machine is varied by the up-down motor which, by means of a timing belt,
turns the lead screw nuts on the 2 elevation bars. The motor has an integral encoder wheel which, by
means of a photocell, provides the motor motion control signal: each motor revolution corresponds
to a predetermined number of pulses and to a predetermined displacement on the elevation bars.
The direction of rotation of the motor determines whether the treadmill moves upward or
downward.
3.3.2. C
ONTROLS
To vary the incline, the CPU board sends the up-down board an Up signal (move motor in the up
direction to increase the elevation) or a Down signal (move motor in the down direction to decrease
the elevation). The up-down board accordingly actuates the motor the appropriate direction, by
supplying it with a positive or negative voltage. When the motor moves, the photocell generates the
pulses which are received by the up-down board. The up-down board counts the pulses received
and, when the number corresponds to a 0.5% variation in the incline, toggles the level of the Status
signal transmitted to the CPU board. The CPU board counts the number of Status signal transitions
received. When this value corresponds to the desired incline, it resets the Up or Down signal which
produced the movement.
If during the power-up reset, after having asserted the Up or Down signal, the CPU board does not
receive any Status signal within a few seconds, it resets the asserted signal and displays error
message “GRADE MOVEMENT OUT OF ORDER” to indicate absence of movement.
3.3.3. T
HE SIGNALS INVOLVED
The machine controls the elevation through the CPU board and the up-down interface board as
shown in the figure below:
Photocell
CPU board
13-15
Up-down
board
Status
Down
Up
14-15
12-15
2-4
3-4
1-4
CN1
CN2
M
Vdc
Pulses
Switch
3-6
4-6
1-2
2-4/CN1
CN3
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