RUN EXCITE: Service & Maintenance Manual - rev. 1.5
• provides an optically isolated interface for the 485 serial communication between the boards;
• provides an interface for loading firmware to the inverter.
The board includes the following test points:
Test point
name
Description
+5V
GND
Inverter Side +5 Vdc power supply
+5V_EXT
GND_EXT
Display side +5 Vdc power supply
The board includes the following indicator LEDs:
LED name Color Description
PWRE green
if ON indicates that the board is correctly
supplied with +5 Vdc on the display side
RST red
if ON indicates that an inverter reset signal is
asserted
PWR green
if ON indicates that the board is correctly
supplied with +5 Vdc on the inverter side
PROG red
if ON indicates that communication is in
progress on the inverter programming
channel
COM green
if ON indicates that communication is in
progress on the inverter communication
channel
and one button:
Name Description
S2 resets the communication
3.1.13. ELEVATION + CUT-OUT BOARD
This board handles several distinct functions:
• Control of the elevation motor: to drive the elevation motor, it receives the signals from the
inverter for upward or downward movement, and switches a relay accordingly to supply the
correct voltage to the motor. Receives the pulses generated by the encoder on the motor, and
sends them to the inverter. Also receives the signal from the limit switch.
• Manages the emergency stop signal: in order to effect the emergency stop, the board controls
the power supply to the relay which isolates the supply to the inverter. When the emergency is
tripped it stops supplying the relay coil, which is thereby de-energized and disconnects the
inverter power supply.
• Manages the signal from the tread belt motor thermal cut-out: this is a normally closed signal
which becomes open in the event of the motor overheating. In such a case, the condition is
signaled to the inverter which generates an error and cuts off the power supply to the motor.
Page 3.9
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