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3.2.1 GRADIENT MOTOR CONTROL
The CPU board (HK) communicates the set training profiles to the drive via the RS-485 serial com-
munication.
Based on the received commands, the drive sends the +24Vdc or -24Vdc power supplies to the
gradient motor. When the motor receives the voltage, it starts to move.
In order to control the position of the gradient, the drive has an input limit microswitch.
The microswitch identifies the position of reference, acquired by the equipment during the rest pro-
cedure carried out each time the equipment is turned on and each time the microswitch is pressed.
The limit microswitch is normally closed (NC), and opens when pressed.
3.2.2 RESET PROCEDURE
When turned on and each time the emergency button is pressed and reset, the equipment carries
out the reset procedure in order to determine the reference of the gradient. The equipment per-
forms a downward movement until the limit microswitch is actuated, then it moves up until the limit
switch is switched, which is again closed and for another 242 pulses, thereby arriving at a slope
equal to 0%.
All movements for obtaining a different gradient are variations with regard to this reference.
Only when turning on, and during the reset procedure, the drive also carries out procedure for
encoder timing on the motor, consisting in two brief and quick movements of approx. 1 sec. each.
3.2.3 INVOLVED SIGNALS
The following signals are involved with the control:
•
RS-485 signal: It is a digital signal exchanged by the drive and CPU board (HK).
•
Motor voltage (Vdc): This is the continuous voltage generated by the drive to supply the
gradient motor. In absolute values it is equal to 24Vdc and depending on its sign, the motor
rotates clockwise or counterclockwise. As a result, the gradient of the equipment increases
or decreases.
•
Pulse signal: This is a square wave signal 0 - 5V and 50% duty cycle produced by the Hall
sensor when the gradient motor moves. It is sent to the drive to provide feedback about
the movement.
This signal varies between a value of 0Vdc and a high value of 5Vdc. Measured with a
multi meter, this signal can be either 0 or 5Vdc when the motor is stopped, whereas during
movement it is approx. 2.5Vdc.
To function correctly, the Hall sensor must be supplied with a voltage of +5Vdc, which is
supplied by the drive.
•
Limit microswitch signal:The limit microswitch is an NC contact that enters the drive.
The contact is opened when the equipment presses it during the reset procedure.
- 28 -
TECHNOGYM RUN Technical Service Guide
TSG-00284-EN- Uncontrolled copy if printed
Rev. 1.0
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