Inverter; Belt Motor; Up-Down Motor; Power Supply - Technogym Forma Service Maintenance Manual

FORMA: Service & Maintenance manual - rev. 3.0
• DC voltages by-pass: receives the low voltages generated by the power supply and sends them
to the CPU board.
3.1.5. I
NVERTER
This is the device which supplies the three-phase belt motor. It receives a DC reference voltage
from the driver board. Variations in this voltage cause corresponding variations in the operating
frequency of the sinusoidal wave provided by the inverter to the motor phases, and hence change the
speed of the tread-belt. It handles motor drive errors and, in the event of an error, shuts down the
power supply to the motor and sends an alarm signal through the driver board to the display. The
event which caused the error is memorized as an error code.
The model used is Hitachi SJ100 version SJ100-011NFE with a power rating of 1.1 KW (1.5 Hp).
WARNING: The inverter is isolated from earth. It is fixed using plastic screws and
washers to ensure its isolation from the machine frame.
3.1.6. B
ELT MOTOR
An asynchronous three-phase motor which, by means of a pulley and a poly-v belt, turns the driving
roller of the tread-belt. Each motor phase is equipped with a normally-closed bimetallic safety
which opens when the temperature exceeds a preset threshold, in order to safeguard the integrity of
the motor. The 3 bimetallic safeties are connected in series and reach the inverter as a NC external
input signal. When this contact opens, the inverter generates an alarm.
The tread-belt motor has a power of 1.1 KW (1.5 Hp).
The motor used on Forma 3 is different from the one used on Forma 2.
WARNING: The tread-belt motor is isolated from earth. It is fixed using plastic
bushings and dowels to ensure its isolation from the machine frame.
3.1.7. U -
P DOWN MOTOR
This is a linear actuator equipped with a 24 V DC motor, incorporating a reduction unit and a rod
that is moved backward and forward by the motor. The rod actuates a frame connected to the front
wheels of the machine: when the rod moves it causes the frame to move, thereby raising or lowering
the machine.
The actuator has a built-in reed sensor which functions as an encoder, outputting pulses as the motor
turns. This provides the necessary feedback signal for determining the position of the rod and hence
the machine incline.
3.1.8. P
OWER SUPPLY
Receives the mains voltage at its input and outputs the DC voltages (+5 V and +12 V) which supply
the display and the inverter interface board. This power supply is equipped with mains voltage
autosensing.
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