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Service and Parts manual (Version B)
25
Wireless
3.5
Control system
The control system on the columns ensures that raising and lowering of the column
lifts is simultaneous and synchronized, independent of the load distribution on the
columns.
Each column lift has a potentiometer that detects the height position and passes it
on to the control system. The control system controls and protects the lifting system
during raising and lowering in the following manner:
• When there is an elevation difference of more than 15 mm and less than 30 mm, an
extra correction valve in the hydraulic system opens until the elevation difference
between the column lifts is eliminated.
• Lowering will be interrupted when the elevation difference is more than 30 mm and
less than 60 mm. A lifting fork may be blocked. The cause of the fault must then be
traced. You can still lift and the correction valve in the hydraulic system will open
until the elevation difference has been synchronized.
• When the elevation difference exceeds 60 mm, the control voltage will be cut off,
causing all movement to stop. The cause of the fault must then be traced.
NOTE
Height differences may be caused by oil leakage in cylinders or valves.
The control system is also designed so that:
• Any column lift can be controlled individually.
• Any pair of axles can be controlled individually; for an explanation, see chapter
Operation in the Operating Manual.
WARNING
Controlling individual column lifts and/or pairs of axles is exceptionally hazardous.
Refer to section Safety when hoisting in the Operating Manual.
The control is equipped with a number of programmable settings, see Service Manual.
3.6
Hydraulic power unit
The hydraulic power unit comprises an electrically powered pump, flow control valves,
control valves and a fluid reservoir.
3.7
Column, lifting cylinder and guide block
The column and lifting cylinder together form the most important part of the mobile
column lift. A guide block with rollers is located within the U-shaped profile of the
column. The rollers enable the guide block to move up and down the entire length of
the column. The lifting force is supplied by the hydraulic lifting cylinder.
Summary of Contents for ST 1065-FWF
Page 1: ...Mobile column lifts Wireless Service and Parts manual 2015 Stertil B V 38007815 B ...
Page 109: ...Service and Parts manual Version B 109 Wireless 8 18 Hydraulic cylinder ST1075 ...
Page 111: ...Service and Parts manual Version B 111 Wireless 8 19 Hydraulic cylinder ST1065 ST1085 ST1100 ...