RUN EXCITE-2008: Service & Maintenance Manual - rev. 1.3
Page 3.15
3.3.
ELEVATION MOTOR DRIVE
3.3.1.
M
ECHANICS
The machine incline is varied by moving a frame connected to the front wheels by means of the
elevation motor rod. The motor movement is detected by a hall sensor which provides the motor
motion control signal: each motor revolution generates a predetermined number of pulses and
produces a known displacement of the rod and hence of the machine incline. The direction of
rotation of the motor determines whether the machine moves up or down.
3.3.2.
C
ONTROL
The control block diagram is as follows:
To actuate the motor, the display board communicates over the RS-485 serial link with the ALE/AT
UL driver. Based on the commands received, the ALE/AT UL driver, by means of a relay on the
board that switches, applies a +24 or -24 Vdc voltage to the motor. When the motor is powered, it
starts turning.
To control the incline position, the machine reads the signals outputted by:
•
a limit switch which defines a zero-reference position, acquired by the machine during its
power-on reset procedure. In normal condition, the limit switch outputs a NC contact that
goes open when it is pressed.
WARNING: when the limit switch outputs an open contact (limit switch pressed, broken
or cable disconnected), the down movement is disabled.
Display Board
Hall sensor
ALE/AT UL
driver
RS-485
CN2
J4
M
Vdc
Pulses
Limit
switch
3-8/J8
2-1/J7
6-4/J7
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