Wilo Rexa CUT, Installation And Operating Instructions Manual

Page: 53 / 384

Installation and operating instructions Wilo-Rexa CUT 53
TROUBLESHOOTING AND POSSIBLE SOLUTIONS English
Necessary tools
• Torque wrench with size 4 Allen wrench insert
• Size 5 allen wrench
• Size 4 allen wrench
Work steps
1. Unscrew the grub screws from the cutting plate.
2. Press the cutting plate against the internal blade
so that they come into contact.
3. Slowly screw in the four cylinder head screws,
gently and by hand , until they are against the
cutting plate.
Attention: do not screw in tightly!
4. Screw the grub screws back into the cutting plate
and tighten them crosswise using the torque
wrench.
Tighten as follows:
• Grub screw 1: 3 Nm
• Grub screw 2: 6 Nm
• Grub screw 1: 6 Nm
• Grub screw 3: 3 Nm
• Grub screw 4: 6 Nm
• Grub screw 3: 6 Nm
External macerator (CUT GE)
Normally, the gap between the cutting plate
and rotating blade is 0.1 to 0.2 mm. If the gap is
larger, the cutting performance may decline and
clogging may increase. In this case, the gap needs
to be readjusted.
The gap here is determined by the shims between
the rotating blade and the impeller. The shims
have a thickness of 0.1 mm and 0.2 mm.
Fig. 9.: Overview of macerator
1 Rotating blade 4 Fastening screw
2 Cutting plate 5 Impeller
3 Shims
Necessary tools
• Torque wrench with size 5 Allen wrench insert
• Size 5 allen wrench
• Suitable equipment for fixing the rotating blade
in place
Work steps
1. Fix the rotating blade in place with suitable
equipment and unscrew the fastening screw.
Attention: the blade has sharp edges! Wear
suitable protective gloves!
2. Remove the rotating blade.
3. Set a gap of 0.1 to 0.2 mm by removing or replac -
ing shims.
Attention: the blade must not grind against the
cutting plate.
4. Replace the blade and screw in the fastening
screw. Tighten the fastening screw with 37 Nm.
5. Measure the gap and repeat the work steps if
necessary.
9. Troubleshooting and possible solutions
In order to prevent damage or serious injury while
rectifying pump faults, the following points must
be observed:
• Only attempt to rectify a fault if you have quali-
fied staff. This means that each job must be car -
ried out by trained specialist staff. For example,
electrical work must be performed by a trained
electrician.
• Always secure the pump against an accidental
restart by disconnecting it from the mains. Take
appropriate safety precautions.
• Always have a second person on hand to ensure
the pump is switched off in an emergency.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the pump are made at
the operator's own risk and release the manufac -
turer from any warranty obligations.
Fault: Pump does not start
1. Electricity supply interrupted, short-circuit or
earth fault in the cable and/or motor winding
• Have the motor and wires checked by a special-
ist and replaced if necessary
2. Fuses, the motor protection switch and/or moni -
toring devices are triggered
• Have a specialist inspect the connections and
correct them as necessary.
• Have the motor protection switches and fuses
installed or adjusted according to the technical
specifications, and reset monitoring equip -
ment.
• Clean the macerator.
3. The sealing chamber control (optional) has inter -
rupted the electric circuit (operator-related)
• See fault: Mechanical seal leaks, sealing cham -
ber control reports a fault or switches the pump
off
Fault: The pump starts, but the motor protec-
tion switch triggers shortly after commission-
ing
1. The thermal trigger on the motor protection
switch is incorrectly set
• Have a specialist compare the setting of the
trigger with the technical specifications and
correct it as necessary
2. Increased power consumption due to major volt-
age drop
• Have an electrician check the voltage on each
phase and rewire if necessary
3. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
4. Excessive voltage differences on the three phases
• Have a specialist inspect the connection and
the switching system and correct as necessary
5. Incorrect direction of rotation
• Swap the 2 phases of the mains supply
6. Macerator blocked
• Switch off the pump, secure it against being
switched back on again, clean the macerator
and correct the cutting gap if necessary