RUN NOW Excite +: Technical Service guide - rev. 6.2
Page 3.24
3.24.4. THE SIGNALS INVOLVED
The machine uses the following control signals:
• RS-485 Signal
This is a digital signal exchanged between the driver and the CPU board.
• Motor voltage signal (Vdc)
This is the DC voltage generated by the driver (pins 2 and 1 of connector J7) for supplying the
elevation motor. Its absolute value is 24Vdc and, depending on its polarity, it causes the motor
to rotate in either a clockwise or anticlockwise direction. The incline of the machine will
increase or decrease accordingly.
• Pulse signal
This is a square wave signal with frequency 50 Hz (T=20 msec) and 50% duty cycle generated
by the Hall sensor when the elevation motor moves. This signal enters the driver (pins 6 and 4 of
connector J7) and provides the feedback of the motor movement.
This signal alternates between a low value of 0Vdc and a high value of 5Vdc. When measured
with a multimeter, this signal is at either 0 or 5Vdc when the motor is stopped, while during
motor movements it is approximately 2.5Vdc.
In order to function correctly, the Hall sensor requires a +5Vdc supply voltage which it receives
from the elevation board (pins 5 and 4 of connector J7).
• Limit switch signal
The limit switch is a NC contact entering the /AT UL driver (pins 3 and 8 of connector J8),
which opens when the machine pressed it during the power-on reset procedure.
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