stertil-KONI ST 1055 Installation, Operation & Service Manual page 30

FAULT
Column does not lift.
Column does not
lower.
POSSIBLE CASE
No mains power.
Oil level too low.
Air in hydraulic pump (only
possible after the tank has been
empty).
Safety valve not properly
adjusted
Pump has insufficient yield.
Power interrupted by thermal
relay in primary control box.
Maximum height difference
(more than 2 1/2") exceeded.
No mains power.
Catch not disengaged from
locking system.
The electrically operated
lowering valve on the hydraulic
unit does not open.
Dirty lowering valve.
Maximum height difference
(more than 1 1/4") exceeded.
Maximum height difference
(more than 2 1/2") exceeded.
(From highest position) Setting to
the highest position practically
coincides with the engagement of
the catch.
REMEDY
Have fault corrected by a qualified electrician.
Add oil as necessary, refer to lubricating instructions on
lifting column.
Press the ⇑ (UP) and SET REF buttons until the lifting
column rises (max. 1 minute).
Have valve adjusted, contact Service Department to
check valve.
Replace the pump.
Reset the thermal relay.
If the defect occurs again, contact the service department.
Set the main switch to OFF and ON. Press the "SET REF"
button twice to make the system ready for operation again.
If the defect occurs again, contact the service department.
Have fault corrected by a qualified electrician.
Raise column approximately 2" and then lower.
No mains power for solenoid or lowering valve is faulty.
fault Have corrected by the Service Department.
Have valve cleaned or replaced by service department.
Press on lifting until the height difference has been
cancelled out. If lifting is not desired, the "SET REF" button
can be pressed once. Following, lowering can be activated.
The difference of 1 1/4" will be maintained.
If the defect occurs again, contact the service department.
Set the main switch to OFF and ON. Press the "SET REF"
button twice to make the system ready for operation again.
If the defect occurs again, contact the service department.
Slightly raise the ramp by touching S2. Then set highest
position stop (see fig. 7.1)
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