STEPRACE: Service & Maintenance Manual - rev. 1.2
Page 3.3
(5) ALTERNATOR INTERFACE BOARD
Receives from the display a square-wave signal whose frequency is proportional to the
selected level of difficulty, and sends it to the alternator. Receives the RPM signal from the
alternator, which it filters and sends to the display for calculating the speed of exercise (SPM).
(6) 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 pulses 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.
Starting from the model manufactured by MAGNETI MARELLI, the excitation
circuit is equipped with a series-connected thermal cutout, which is normally
closed and opens when the temperature exceeds an established threshold.
(7) POWER RESISTOR
Has the function of dissipating the energy produced by the alternator.
(8) SELECTION KNOB
This knob is used for selecting the stepping mode:
• mode A: independent stepping motion. The user must maintain a “floating” position by
moving the pedals at a rate which depends on the difficulty level of the workout.
• mode B: dependent stepping motion. When one pedal goes up the other comes down and
vice versa. The user must move the pedals at the speed indicated by a pacer, which
determines the difficulty level of the workout.
The selection knob operates a microswitch:
• mode A: the knob is in the “out” position and the microswitch is in its normal released
state. In this condition the electrical contact is closed.
• mode B: the knob is pushed “in” and the microswitch lever is pressed. In this condition
the electrical contact is open.
By reading the state of the microswitch signal, the machine is able to detect the selected
stepping mode and control the resistance accordingly.
The microswitch is installed on machines starting from SN 206.
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