RUN MED: Service & Maintenance Manual - rev. 1.0
6.9. “GRADIENT NOT WORKING” MESSAGE ON THE
DISPLAY
If the elevation does not work and there is no error message on the display, the elevation
movement may have been disabled in the configuration menu. For further details, refer
to paragraph 9.1.12. “Enable up/down motor”.
Check parameter PAR 09 is:
• 250, if the AT driver is running SW version 2.05.
15, if the AT driver is running SW version 2.07 or higher. •
This parameter defines the time window within which the inverter expects to receive a
sufficient number of pulses from the elevation motor, before generating an error
condition.
Check that the AT driver is running SW version 2.05. or higher. Older SW versions had
a problem which generated elevation errors when the direction of movement of the
1.
2.
d 1%. At this point, the elevation function will be locked out and
3.
e a pulse.
ot happen anymore, supposing it was
enerated by a noise, the machine restarts to work properly.
elevation motor was abruptly changed.
This error message indicates that the machine is unable to control the elevation motor. The error
is produced when the inverter does not receive pulses from the motor encoder, after having
enabled it. In this case the machine disables any movement and sets the parameter PAR 07 to 1.
The error message may be caused by a problem with the lower limit switch. In fact if the limit
switch malfunctions or accidentally remains in the open-contact state, rather than in the
normally closed state, the error is not generated immediately but will occur as soon as the
elevation is increased beyon
parameter PAR 07 set to 1.
The error message may be due to a misalignment of the elevation motor encoder. In fact, if the
encoder of the elevation motor is not correctly positioned, the motor will fail to produc
At this point, the elevation function will be locked out and parameter PAR 07 set to 1.
When the machine is switched on again, the parameter PAR 07 is automatically reset to 0 and the
machine performs the reset procedure. If the error does n
g
It might also be helpful to refer to the theoretical explanation of the elevation control,
provided in paragraph 3.3. “Elevation motor drive”.
Page 6.27
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