RUN NOW Excite +: Technical Service guide - rev. 6.2
Page 3.16
3.22.2. AT-UL DRIVER BOX
It is the upper board of the assembly and it is the heart of the driver: it does everything was
described above for the AT driver except the function of the AT power supply board described
below. In details:
It receives the line voltage and, through a PFC module, it rectifies the voltage to the 400 Vdc
used to generate the 3 phase voltage for the belt motor and to power up the AT power supply
board.
Internally it houses an inverter to control the belt motor;
Internally it houses a DC driver to control the elevation motor.
The board includes the following indicator LEDs visible when the AT driver cover is removed:
ALARM ROSSO
If ON indicates that the AT driver has detected an error
(EdC) when it was moving the elevation motor. This LED
stay ON for about 1 second and then goes OFF.
EN_UP VERDE
if ON indicates that the motor has received the supply
voltage for movement in the upward direction
EN_DOWN ROSSO
if ON indicates that the motor has received the supply
voltage for movement in the downward direction
TACHO VERDE
functioning of elevation motor encoder: if blinking, indicates
that the board is receiving the pulses from the encoder
DWN_SW VERDE
status of Limit switch contact: if ON indicates that the
microswitch is pressed
3.22.3. AT-UL POWER SUPPLY BOARD
It is the lower board of the assembly and it receives the 400 Vdc from the AT driver board and
outputs to the AT driver board the low voltages used by the machine.
3.22.4. FANS
There are 2 fans powered with 24 Vdc used to cool down the AT driver.
3.22.5. BREAKING RESISTOR
It is a 150 Ohm used by the AT driver board to dissipate the energy produced by the motor when it
is working as a generator.
3.22.6. POWER SUPPLY BOX
It is a box that contains:
Power entry socket;
ON-OFF switch;
2 circuit breakers that check the overload on line and neutral;
A mutual inductance.
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