Up-Down Motor Drive; Mechanics; Controls - Technogym Forma Service Maintenance Manual

3.3. UP-DOWN MOTOR DRIVE

3.3.1. M
ECHANICS
The machine incline is varied by the up-down motor rod, which moves a frame connected to the
front wheels. The motor movement is detected by a hall sensor which provides the motor motion
control signal: each motor revolution corresponds to a predetermined number of pulses and to a
predetermined 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
ONTROLS
To vary the incline, the CPU board sends the driver board an Up signal (move the motor in the up
direction to increase the elevation) or a Down signal (move the motor down to decrease the
elevation). The driver board accordingly actuates the motor in the appropriate direction, by
supplying it with a positive or negative voltage. When the motor moves, the sensor generates the
pulses which are received by the driver board. The driver board filters the pulses and sends them to
the CPU board which counts the pulses received, and on reaching the number corresponding to the
desired incline, resets the Up or Down signal which produced the movement.
If, after having asserted the Up or Down signal, the driver board detects a motor overcurrent, it shuts
down the supply to the motor and sends an alarm signal to the CPU board. On receiving the alarm
signal, the CPU board resets the Up or Down signal which generated the problem, and displays error
message "E5".
On power-up, the machine performs a reset procedure in order to determine the reference incline.
The procedure consists of the following steps:
• Small upward movement of the machine;
• Downward movement of the machine until the motor rod is fully inserted and blocked. This
causes the motor to be supplied with the rotor blocked. In these conditions, the motor draws
such a high current that the driver board shuts down its supply and sends an alarm signal to the
CPU. The receipt of this alarm signal defines the reference "zero position" for the incline: all the
movements for reaching different elevations will be variations referred to this reference.
• Upward movement of the machine until the CPU board receives a predetermined number of
pulses, corresponding to the movement of the rod to the established 0.0% incline position.
Page 3.8
FORMA: Service & Maintenance manual - rev. 3.0