STEP 600 XTPRO: Service & Maintenance Manual - rev. 1.1
Page 3.3
3.1.5. POWER SUPPLY
Receives the mains voltage at its input and outputs the DC voltages (+5 Vdc, +12 Vdc and −12
Vdc) which supply the display and the alternator interface board.
The machine uses only +5 Vdc and +12 Vdc.
3.1.6. ALTERNATOR INTERFACE BOARD
Receives from the display a PWM signal whose duty cycle is proportional to the selected level of
difficulty, and converts it into a DC excitation voltage for the alternator. Receives the RPM signal
from the alternator, which it filters and sends to the display for calculating the speed.
3.1.7. ALTERNATOR
Is put into rotation by the user, and generates a resistance to the movement proportional to the
excitation voltage received from the alternator interface board. It also generates the RPM signal (6
impulses per revolution) necessary for counting the number of revolutions and hence measuring the
speed. Its rotation produces energy which is dissipated by the power resistor.
There is a thermal cutout connected in series with the excitation circuit, which is normally closed
and opens when the temperature exceeds an established threshold.
3.1.8. POWER RESISTOR
Has the function of dissipating the energy produced by the alternator.
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