RUN EXCITE: Service & Maintenance Manual - rev. 1.5
Page 3.16
• Up/Down Signal
This is the signal generated by the inverter (pins 15-6) to determine the direction of movement
of the elevation motor. The signal is –24 Vdc for elevation movements in the “down” direction,
and 0 Vdc for movements in the “up” direction.
The signal enters the elevation board (pin 1-2 of connector X5) and is used for switching the
relay.
• Motor voltage signal (Vdc)
This is the DC voltage generated by the elevation board (pins 1-2 of connector X2) for
supplying the elevation motor. Its absolute value is 24 Vdc 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 alternates between a low value
of 0 Vdc and a high value of 5 Vdc. When measured with a multimeter, this signal is at either 0
or 5 Vdc when the motor is stopped, while during motor movements it is approximately 2.5
Vdc.
The signal enters the elevation board (pins 6-4 of connector X2) where it is level-converted and
then output (pins 5-8 on connector X5) to the inverter (pins 18-6). This signal varies between a
logic-level low value of 0 Vdc and a high value of 24 Vdc. When measured with a multimeter,
this signal is either 0 or 24 Vdc when the motor is stopped, while during motor movements it is
approximately 11 - 12 Vdc.
In order to function correctly, the Hall sensor requires a +5 Vdc supply voltage which it
receives from the elevation board (pins 1-4 of connector CN1).
• Limit switch signal
The Limit switch is a NC contact entering the elevation board (pins 6-5 of connector X3), which
opens when the machine pressed it against the during the power-on reset procedure. This signal
is level converted and sent (pins 7-8 of connector X5) to the inverter (pins 17-6 ). This signal is
–24 Vdc when the contact is closed and 0 Vdc when it opens.
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