Perfecta 115 UC - Malfunctions in the Hydraulic Clamping System

1/01 E Service Instructions 31
Malfunctions in the
Hydraulic Clamping
System
If malfunctions occur in the hy-
draulic clamping system, always
check the following first:
- Oil filling level in the tank. Re-
plenish, if necessary.
- Pump drive. Re-tension belt, if
necessary.
Possible malfunctions and their
rectification:
•When a cut is triggered by the
knife pushbuttons, the clamp
touches down on the stock, how-
ever, no cut follows. Releasing
the knife pushbuttons makes the
clamp return to its topmost posi-
tion.
Remedy:
- The flow indicator is not oper-
ated.
To adjust the flow indicator, refer
to "Adjusting the Hydraulic
Clamping System".
- Defective reed contact of the
flow indicator.
Replace contact.
• When a cut is completed,
- the clamp stays on the stock
(machine sizes 76 and 92);
-slowly returns to its topmost po-
sition (machine sizes 115 and
132).
When another cut is triggered,
the display reads error 28: Safety
Module Detecting Error.
When the "C" key is pressed con-
crete error 23: Valve Monitoring,
appears.
. .
Remedy:
- The flow indicator remains op-
erated.
- Reed contact welding. Replace-
ment of the contact is necessary.
• No "pre-clamping" when the
pedal is pressed, i. e. the clamp
would not come down.
Remedy:
- Check the pump pressure at M1
with a test pressure gauge when
the oil is freely circulating, and
when pre-clamping. For the val-
ues, refer to the Table (Fig. 34)
When no pressure is available:
- Defective pump. Replace the
pump.
- VD1, VD1.1 or VD2 is overflown.
Repair may, for safety reasons,
only be performed by trained per-
sonnel.
When the required pressure is
available:
- Check the machine for proper
alignment and, in conjunction
therewith, for free movement of
the clamp. Check for possible
canting of the clamp draw rods.
Readjust the clamp guideways, if
necessary.
•The clamp moves up slowly af-
ter pre-clamping.
Remedy:
- Check the clogging indicator on
the filter according to "Checking
the Filter" in the Operating In-
structions manual.
- Check the machine for proper
alignment and, in conjunction
therewith, for free movement of
the clamp. Check for possible
canting of the clamp draw rods.
Readjust the clamp guideways, if
necessary.
- Fatigue of the clamp balancing
spring.
For machine sizes 76 and 92:
Replace spring assembly.
For machine sizes 115 and 132:
Tension the tension spring as-
sembly in the machine upper
cross beam. Accessible under
the upper right paneling.
• No clamp fast-speed movement
before clamping pressure build-
up.
Remedy:
- VD2 not properly set. Refer to
"Adjusting the Hydraulic Clamp-
ing System".
Check the pressure at M1 with a
pressure gauge according to the
Table (Fig. 34).
- VD2 overflow (e. g. spring break-
age). Insufficient pressure build-
up. Replace valve.
- Multi-way valve Y1 or Y2 does
not operate.
Y1 does not operate: Insufficient
pressure build-up through VD1,
VD1.1.
Y2 does not operate: Free flow
through VDR and F into the tank.
Replace multi-way valve.
- Air in the hydraulic system. Ven-
tilate system according to Sec-
tion "Start-Up".