The Control Signals - Technogym Top 600 XTPRO Service Maintenance Manual

TOP 600 XTPRO: Service & Maintenance Manual - rev. 2.0
3.2.3. T
HE CONTROL SIGNALS
The machine controls the difficulty level of the workout by means of the CPU board, the alternator
interface board and the alternator, as illustrated in the figure below:
The following signals are involved in the control loop:
• Excitation signal (PFM and Ve)
This is the signal generated by the CPU board (pin 6-3 of connector CN1) for controlling the
resistance. It is a PFM signal, i.e. a square wave signal with variable frequency. The logic of
this control causes the frequency to increase with increasing resistance.
This signal enters the alternator interface board (pin 6-3 of connector CN1), and is converted in
analog signal and sent to the alternator (pin 4-5 of connector CN2 on the alternator interface
board) to supply its rotor via the brushes.
• Voltage across the resistor (Vr)
This is the dc voltage which the alternator dissipates on the resistor: the higher the excitation
signal, the higher the dissipated voltage. This signal provides an effective measure of the
electrical power generated by the alternator.
This signal reaches the alternator interface board (pin 3-2 of connector CN2), where it is read
and used as a feedback signal by the alternator interface board to adjust the excitation.
CPU board
6-3 CN1
PFM
6-3 CN1
Alternator interface
3
board
Vr
2
CN2 4-5
Ve
Resistor
5-3
RPM
5-3
1-5
RPM
Alternator
Page 3.5