Use and maintenance manual Self-propelled aerial platforms Page 21
5.1.3.2
Automatic levelling jack control (OPTIONAL)
The machine can be supplied with an optional automatic levelling system. The system has two operating modes:
-
manual mode
(see previous paragraph)
-
automatic mode
.
For
AUTOMATIC LEVELLING
set the control lever
ZC
downwards. The control system will independently control the levelling
cylinders until the machine is levelled.
Levelling is correct when:
-
all four warning lights
ZB
turn on;
-
Inclination alarm warning light
S
turns off (if an alarm condition due to instability was present before levelling control) and
lifting enable warning light
T
turns on at the same time.
For
AUTOMATIC RETRACTION
of all pads, set the control lever
ZC
upwards. The control system will retract all pads up to
the upper stop. Retraction is complete when all warning lights
ZB
turn off.
Also the automatic control of the levelling jacks is enabled by the “dead-man” button (or “dead-man” pedal - Optional).
During automatic levelling, the system aims to level the machine within an allowance of 0.4° both
longitudinally and transversally. The system continues the pad control until levelling within this
tolerance is reached. If the automatic system is unable to obtain levelling within the expected
allowance, yet the four pads are firmly resting on the ground and the machine is within the stability
limits controlled by the inclinometer, the lifting enable green warning light T will still light up and lifting
can be carried out.
Excessive longitudinal and/or transversal inclinations may prevent the automatic levelling from being
reached.
