Technogym ELLIPTICAL - Brake Control; Control; Brake Board (Low-Kit)

3.2 BRAKE CONTROL
3.2.1 CONTROL
In order to set up a specic exercise di󰀩culty: the Brake Board communicates with the Display
Board, via the RS-485 serial cable, indicating speed value of the exercise in SPM (steps per min-
ute).
When the SPM ≠0 : the exercise starts. On the basis of the commands received from the Display
Board (by the di󰀩culty level), the Brake Board sends an excitation current to the winding on the
brake which will generate an electromagnetic eld.
When the SPM =0: the Brake Board does not send any excitation current to the brake.
Due to the electromagnetic eld produced by the current sent from the Brake Board to the winding,
and by the rotation of the disk, eddy currents will be induced on the disk itself which will generate
a force that will tend to slow down its movement. This will then generate resistance on the pedals.
The higher the value of the current sent by the Brake Board to the winding, the greater the resist-
ance produced. In addition, when the excitation of the brake is the same, the higher the speed of
the disk rotation, the higher the watt produced.
Training mode with constant power (W):
Assuming that: W = ω * torque, (W = power; ω = angular speed):
The User Interface (U-I) sends to the Brake Board the target value of power, that the user shall
supply. Depending on the speed, the Brake Board adjusts the excitation current to the winding, in
order to match the target value received.
Training mode with constant level:
During movement, if the SPM ≠0: the Brake Board regulates the excitation current to the winding
according to the di󰀩cult level set by the customer.
Training mode with constant heart rate:
Based on the heart rate set: the U-I commands the Brake Board, which sends a variable excitation
current to the winding on the brake, in order to maintain the constant heart rate set.
3.3 BRAKE BOARD (LOW-KIT)
The Brake Board:
▪ Supplies power to the Display;
▪ Communicates with the Display Board (high kit), via the RS-485 serial line, in order to man-
age:
- the signals for controlling the resistance which needs to be supplied to the Electromagnetic
Brake;
- the error messages;
- the signals modifying the board conguration parameters;
TECHNOGYM ELLIPTICAL Technical Service Guide
Rev. 1.1
- 20 -
Uncontrolled copy if printed Uncontrolled copy if printed