Atlas 12AWFSL, Installation & Operation Manual

Page: 13 / 82

Product Description 13
12AWFSL
This chapter describes the lift’s principal elements, allowing the user to be
familiar with the machine. As shown in fi gure 2, the lift is composed of two
runways: P1(1) and P2 (2) with two wheel free jacks (3), anchored to the
ground by means of its base (4). At a special request, two jack beam (5) can be
supplied and operated by an air-hydraulic pedal pump.
Runways are linked to the base by means of a scissors lifting system. The lifting
system of each runway is composed of scissor arms (6) and a hydraulic cylinder
(7). Turntable recess cover (8) is supplied with the lift in case for non-alignment
purpose. Lifting and lowering motion of lift and wheel free jacks is carried out by
operation of a control unit (9) placed next to the lift.
The leveling system of the lift is carried out manually by operation of the leveling
cocks in the power unit. The mechanical safety operating by a pneumatic
cylinder (10) is built under each runway and wheel free jack for engagement and
release. Two limit switches are installed in the P1 base: for top position limit and
for the safety height limit.
4.2 Operation
Lift lifting is carried out by the hydraulic unit which acts upon the cylinders.
The platforms are raised simultaneously owing cross feeding of the hydraulic
cylinders. Lowering, even though electrically controlled, is carried out by the
weight of both the platforms and the load lifted. Lowering motion of the wheel
free jacks with load less can be sped up by means of pneumatic action in the
chamber of its slave cylinder. The hydraulic system is protected by a max
pressure valve thus preventing pressure from exceeding the maximum fi xed
safety limit.
Lifting and lowering motion of the lift is controlled by the push buttons on the
control panel. The synchronization of the platforms is guaranteed by a master/
slave circuit. Whenever the lift has to be lowered to the ground and the lowering
button is pressed, the lift will stop at about 18” from the ground. In this way, the
operator must verify that neither persons nor objects are within the safety area.
If so, the fi nal lowering button can be pressed and the lift be lowered. A beep
sound is heard during the last travel.