STEP EXCITE: Service & maintenance manual - rev. 1.4
Page 3.12
Due to the eddy currents, energy is dissipated on the brake disk in the form of heat.
During the movement, the speed sensor detects the heads of the brake disk fixing screws, and
produces a speed feedback signal that is sent to the Brake board. The brake board will adjust s the
excitation current of the brake winding so that the speed detected by the speed sensor is equal to the
set value.
NOTE: Closed-loop control.
If the brake board does not receive a speed signal, which indicates that an exercise
session is in progress, the machine will not produce any resistance.
During the movement, the brake board monitors for possible malfunctions. The errors which can
occur are:
Error
Code
Description
1
OVERHEATING: this condition occurs when the temperature detected by
the sensor on the circuit board exceeds 90°C.
8
OVERVOLTAGE: this condition occurs when the +12 Vdc voltage goes
above 13.7 Vdc (only on the 500i, 700i, and 700i E models).
In all the cases, the brake board interrupts the supply of current to the brake, the green LED
changes from being steadily on to blinking and sends an error message to the display board which
displays the “THE EQUIPMENT IS BLOCKED” message.
3.2.3. THE SIGNALS INVOLVED
The machine uses the following control signals:
• RS-485 Signal
This is a digital signal exchanged between the brake board and the display board. There is no
provision for monitoring its state.
• Excitation current
This is the current generated by the brake board (pins 1-2 of connector CN2) which supplies the
brake winding. The current supplied is a function of the adjustment algorithm.
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