Renfert duomix II, Manual

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7. Troubleshooting
Error Cause Corrective action
LEDs do not light, pressu-
re discs will not move. • The unit is not switched on. • Switch the unit on at the main power switch (16, fig. 1).
The unit does not switch
on. • Power cord not properly connected to
the unit.
• Fuse blown.
• No power at the wall outlet.
• Unit
fault.
• Check that the unit plug is properly seated.
• Replace the fuse (refer to Sec. 6.5).
• Check that there is power at the wall outlet.
• Return the unit for repair.
Pressure discs will not
move, ”Unit cover” LED
(7, fig. 1) is on or flashes. • Unit cover not properly closed. • Close the unit cover (8, fig. 1) and check that the cart-
ridges are properly seated. If required, seat cartridges
correctly.
Cartridges cannot be
removed / cannot be
installed. • Pressure discs have not fully re-
tracted to their home position.
• Press the retract key (4, fig 1) and allow the pressure
discs to retract until they stop automatically. They are
now in their home position (refer to Sec. 5.1).
A loud sound can be
heard when the mixer
shaft threads itself into
the mixing nozzle. • A spring pushes the mixer shaft
forward until it reaches a stop.
• This is perfectly normal and requires no intervention.
• Only install the mixing nozzle subsequently.
Mixing nozzle (21, fig. 1)
does not turn. • The mixer shaft has not threaded
itself.
• Material has hardened in the mixing
nozzle.
• Check that the cartridge is properly seated.
• Install a new nozzle.
Unit automatically reduces
the Extrusion speed • Unit detects a highly viscous impres-
sion material and automatically red-
uces the feed rate and mixer rotary
speed.
• Contamination (e.g. debris) in the
cartridge holder.
• Insufficient spindle lubrication.
• The pause time was not observed
• This only occurs if the material is highly viscose or is
cold. Refer to the manufacturer’s processing instructions
(processing temperature).
• Clean the inner surfaces of the cartridge holder and pres-
sure plate.
• Lubricate the spindles (special grease!)
• At least 5min intermission
The mixing nozzle bursts
(fig.21). • Incorrect mixing nozzle installed.
• Mixing tip/ foil bag not compatible. • Use the mixing nozzle specified by the manufacturer.
• Contact the manufacturer of the mixing tip / foil bag.
The tubular bag bursts or
is damaged. • Pressure discs are too worn or have
been damaged, causing the tubular
bag to be pinched between the pres-
sure disc and the cartridge.
• The material has partially hardened
in the cartridge.
• Replace the pressure discs (refer to Sec. 6.3).
• Replace the cartridge (refer to Sec. 5.1).
Advance stops for no
apparent reason and the
unit performs a short relief
stroke. • Material has hardened in the cart-
ridge.
• Use new mixing nozzle.
Advance stops for no
apparent reason and the
pressure discs return to
their home position • The controller has detected an over-
load.
• Material has hardened in the cart-
ridge.
• Insufficient spindle lubrication.
• Impression material is too cold, Refer to the
manufacturer’s processing instructions.
• Use a new cartridge.
• Lubricate the spindles (special grease!)
The mixing program LEDs
are flashing while the unit
cover is open. • No mixing program is selected. • Select the correct mixing program for the casting material
(see section 5.1.1)
EN