Lifting System; Operating Instructions - StertilKoni ST 4175 Gebrauchsanweisung

2.3

LIFTING SYSTEM

Each column is provided with a hydraulic unit, a cylinder, a height measuring device (henceforth >potentiometer=) and
an electro-mechanical fall prevention system (henceforth "safety catch").
The vehicle lift is fitted with a control system which ensures following operation. The guide blocks in each column
remain the same height, so that:
- Both tracks remain the same height;
- Lifting stops as soon as the lift is overloaded: lift-stop function.
- Lowering stops in case of height differentials caused by obstacles;
- The control current is switched off if the height differential of the two tracks reaches a pre-determined value;
operation by means of the push buttons on the control box(es) of the vehicle lift is then no longer possible;
- Lifting stops when the highest position has been reached.
The control system receives signals from the 4 potentiometer units on top of the columns. Each potentiometer unit uses
a wire connected to the guide block in the column to 'measure' the height of this guide block (and hence of the track).
It is only during lifting and lowering that the control system regulates the following:
- The correction of height differences through the opening of the hydraulic correction valve (see hydraulic
diagram, fig. N), for any height differential between the highest and the lowest column of more than 25 mm, which
drains oil from the highest cylinder to the tank until the height differential is 10 mm max. (height differentials are, for
example, the result of differences in pump capacities, temperature differences or internal leaks in cylinders or valves).
- Interrupted lifting in the event of height differences of more than 40 mm. If height differences occur during lifting,
then the lift is probably overloaded at one end of the tracks. The lowering function will still be operational.
It is possible that height difference occur during into lowering in the locking system. It is possible that one of the
safety catches missed the tooth of the locking profile. The lift-stop function can be overruled for 2 seconds by
operating the "overrule"button (see fig. 2.1, control panel) and then the lifting button.
- Interrupted lowering in the event of height differences of more than 55 mm. Height differences can be caused by
obstacles below the tracks. The height difference can be eliminated by lifting. The lift-stop function can be overruled
for 2 seconds by operating the "overrule"button (see fig. 2.1, control panel) and then the lifting button.
- The interruption of the supply power to the outputs (valves, safety catch solenoids and motors) when during
operation height differences occur of more than 70 mm.
- The interruption of the supply power to the outputs (valves, safety catch solenoids and motors) when during stand-
by height differences occur of more than 80 mm.
The vehicle lift is also equiped with the following safety features:
- Hose burst valves, which shut off the cylinders in the event of hose rupture.
- An electro-mechanical fall prevention system (henceforth 'safety catches'), which mechanically stops the lowering
movement in the event of power failure.
- Pressure relief valves, which prevent each column from being overloaded.
2.4

OPERATING INSTRUCTIONS

First read the General Instructions, 2.1. Determine the lifting capacity according to §2.2.
Also see the operating sticker on the vehicle lift.
Vehicles should be positioned straight on the lift, the tyres completely on the tracks. The handbrake should be engaged
and the wheels should be blocked. The tracks may only be adjusted without load (and with the round supports
free from the floor). The tracks can be adjusted to the wheel base of the vehicle by means of the adjustment screw
(F.7). Use a wrench 30 mm to turn the screw.
The vehicle lift must be operated by means of the control box (see fig. 2.1) and as an option by means of a secondary
control box. As a standard the control box is installed on column III.
Only the finger tips should be used to operate the control buttons. The use of sharp objects (such as screwdrivers) can
cause damage or faults.
By turning the main switch to position 1 the indicator for the mains and control current lights up. The vehicle lift is
then ready to use.
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