RUN EXCITE-2008: Service & Maintenance Manual - rev. 1.3
Page 3.17
• 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 ALE/AT UL driver
(pins 6 and 4 of connector J7) and provides the feedback of the motor movement.
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.
In order to function correctly, the Hall sensor requires a +5 Vdc 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 ALE/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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