RUN EXCITE-2008: Service & Maintenance Manual - rev. 1.3
Page 3.16
If, during the elevation motor operation, the ALE/AT UL drives detects problems on these signals
and in particular:
•
if no pulses arrive to the ALE/AT UL driver for a time period of approximately 1.5 sec;
•
if the limit switch outputs an open contact and it doesn’t change if the elevation is moved
upward more than 2%.
Then:
•
the ALE/AT UL driver locks out with error code “EdC”;
•
the machine displays the error message “GRADIENT NOT WORKING” and halts all
movements of both the elevation and tread belt motors;
•
The parameter Par 07 is set to 1 to disable the usage of the elevation motor.
If an exercise is started, the machine will resume operation with only the tread belt motor enabled.
Only if the machine is turned off and on again, it will reset the Par 07 to 0 and will restart using the
elevation motor too.
3.3.3.
T
HE RESET PROCEDURE
On power-up, the machine performs a reset procedure in order to determine the zero-reference
position for the incline. The procedure consists of the downward movement of the machine until the
limit switch is tripped, then it moves upward of a number of pulse defined in the elevation table
until the reference “horizontal position”. All movements for reaching different elevations will be
variations relative to this reference.
3.3.4.
T
HE SIGNALS INVOLVED
The machine uses the following control signals:
•
RS-485 Signal
This is a digital signal exchanged between the ALE/AT UL board and the display board.
•
Motor voltage signal (Vdc)
This is the DC voltage generated by the ALE/AT UL driver (pins 2 and 1 of connector J7) 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.
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