1/01 E Service Instructions 32
• No clamping pressure build-up,
or clamping pressure is built up
too slowly.
Remedy:
- See above: "No clamp fast-
speed movement before clamp-
ing pressure build-up".
- Lock the clamp after cutting by
means of the clamp switch on the
front panel.
Refer to "Clamping" in the Oper-
ating Instructions manual.
Readjust VD3 over the entire
range and check the pressure at
M2 with a pressure gauge ac-
cording to the Table (Fig. 35).
Replace VD3, if necessary.
- Check the pressure of the gear
pump at M1 with the aid of a test
pressure gauge when the clamp
is locked and VD3 is set to maxi-
mum. If the gear pump does not
deliver the maximum pressure,
replace the pump.
•The clamp moves up slowly after
the cut.
Remedy:
- See above: "The clamp moves
up slowly after pre-clamping“.
- Y2 does not operate (spring
reset). Replace multi-way valve.
- For machine sizes115 and 132:
Suction valve SRV does not go
open. Check the return spring.
• The clamp bounces when touch-
ing down on the stock to be cut.
Remedy:
- Check non-return valve RV1:
Foreign bodies in the ball seat.
Jammed spring.
• The clamp hits hard against its
upper end position.
Remedy:
- Check the end position damping
in the clamping cylinder.
• The hydraulic oil forms much
foam.
Remedy:
- The suction line of the pump is
not immersed deep enough into
the oil tank. Push the hose more
deeply into the oil tank.
- The connection between the
suction line and the pump is not
tight. Re-tighten the connection.
- Defective pump. Replace the
pump.
• The clamp comes down slowly
and with heavy noise only/the
clamp does not release the pile
any more.
Remedy:
- Rapid speed is blocked by the
STV stop valve. Check the stop
valve.
• Preclamping with the pedal does
not work.
Remedy:
- The rapid speed line is blocked
by stop valve STV. Check the
stop valve.
- Check the setting of switch
S69.1.
• The stroke limit function does
not work.
Remedy:
- Activate the stroke limit function
from the settings menu.
- Check connector X801 on the
control processor for proper
seating.
- Check the setting of switch
S69.1.
- Check stop valve STV.
Adjusting the S69.1 Stroke
Limit Pedal Switch
When the stroke limit function is
active, adjust switch S69.1 on the
pedal so that it deactivates this
function before VDR comes into
effect (clamp upward movement)
when you are slowly pressing down
the pedal. VDR will only respond
when you press the pedal further
down, the ascending movement
changing into a descending
movement. This guarantees that
no pressure will be applied to
clamping cylinder Z through the
main cylinder chamber, even though
STV is closed.
There are two possible malfunc-
tions:
• The stroke limit function is not
deactivated.
Remedy:
-S69.1 is not sufficiently released
to change over when the pedal is
fully pressed down.
-Move away the switch some
more.
• No stroke limit function takes
place.
Remedy:
-S69.1 is not sufficiently pressed
to change over when the pedal is
not pressed.
-Bring the switch nearer.
Make a sensitive switch correc-
tion in both cases.
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