RUN EXCITE-2008: Service & Maintenance Manual - rev. 1.3
Page 3.11
3.1.16. AT DRIVER
This is the electronic device that acts as an interconnection hub for the main components of the
lower assembly, and serves as the point of connection with the display. In fact:
• Controls the motors:
>
it exchanges, over the RS-485 serial link to the digital plan board, the commands for
controlling the tread belt and elevation motors;
> it supplies the tread belt motor with a variable-frequency sinusoidal voltage: varying the
frequency varies the speed of rotation of the motor, and consequently the speed of the tread
belt;
> it exchanges, over the RS-485 serial link to the digital plan board, the error signals
pertaining to the tread belt and elevation motors;
> it exchanges, over the RS-485 serial link to the digital plan board, the commands for
viewing and configuring the inverter parameters;
> it exchanges, over the RS-485 serial link to the digital plan board, the commands for
viewing the errors logged by the inverter.
• Receives the mains voltage at its inputs and outputs the DC supply voltages for the machine
circuit boards listed below:
Supply voltage Connector Description
+24 Vdc XU1 Power supply for the fans of the electrical box
+5 Vdc XU1 Power supply for belt and elevation motor encoders
+5 Vdc
+12 Vdc
XU2 Power supply for display
The board includes the following indicator LEDs:
LED name Color Description
H2 Green
+5 Vdc
H3 Green
+12 Vdc
H4 Green
+24 Vdc
H5 Red
400 Vdc
It contains:
• The AT driver board
• The AT power supply board
• 2 fans
• A breaking resistor
3.1.16.1. AT driver board
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:
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