Technogym SYNCHRO EXCITE 2009 - Page 41

SYNCHRO EXCITE 2009: Service & maintenance manual - rev. 5.2
Page 3.11
The electromagnetic field produced by the winding and the rotation of the disk will induce eddy
currents in the disk itself, giving rise to a force that tends to brake its motion. This generates the
exercise resistance.
A higher brake excitation signal will produce a correspondingly higher exercise resistance. In
addition, for a given value of brake excitation, a higher speed of disk rotation will produce a
correspondingly higher exercise resistance.
Due to the eddy currents, energy is dissipated on the brake disk in the form of heat.
The Brake Board effects an open loop control of the brake, with no provision for regulating the
value of resistance produced but only uses the brake table memorized into the Brake Board.
The precision of the braking system has a tolerance of
±
10%.
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, on the mains operated machines.
On the self powered machines, the speed signal comes directly from the measure of an alternator
phase.
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 500, 700 and 700WTVmodels).
In the case of error 128, the machine remains fully functional, but the braking resistance produced
will not correspond to the value entered on the display. In all other 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
(COM)” message.