Renfert 2961-0000, Instruction Manual

Page: 20 / 110

EN - 6 -
14. Troubleshooting Guide
Fault Cause Remedy
Unit doesn’t blast,
warning lamp flashing.
• Glass pane is not closed.
• Magnet (Fig. 42-A) is missing.
• Protective switch is defect.
• Close the pane.
• Replace the magnet (see spare parts list).
• Exchange during service.
Air flow present but no
sand coming through.
• Amount of sand too low.
• Filter on suction point of suc-
tion pipe is blocked.
• Suction pipe defect.
• Fill with more sand.
• Clean the filter.
• Exchange the suction pipe.
No air, no sand.
• Nozzle is blocked. • Open the blasting nozzle unit (Fig. 15-A) and clean the nozzle.
On/Off switch doesn’t
work.
• No power connection.
• Unit fuse (Fig. 13-B) is defect.
• Connect to the power supply.
• Change fuse (Fig. 13-B) - replacement fuse in set. If it happens
again >>> repair.
Basket shakes,
doesn’t move.
• Basket is stuck mechanically. • Release by removing and replacing the basket.
Blasting chamber gets
too dusty.
• Too little suction power.
• Extraction unit blocked.
• Raise suction power on extraction unit.
• Increase suction performance by closing the air inlet boreholes un-
der the glass holder (Fig. 42-B) (with the supplied magnetic strip).
• Clean extraction unit.
Consumption of blast-
ing material too high.
• Suction power is too high. • Reduce suction power.
Warning: too little suction power can lead to dirty blasting material.
Objects fall out of the
basket.
• Too many objects. • Reduce to a maximum of 6 objects.
Blasting time too long
/ reduced blasting
effect.
• The blasting cones are shelter-
ing the objects.
• Too little working pressure.
• Too great distance from nozzle.
• Too little blasting material in
unit.
• Blasting material lead pipe is
blocked / defect.
• Blasting nozzle is split.
• Air power of the compressor is
too low.
• Remove blasting cones before starting.
• Increase working pressure >>> recommended working pressure:
4 - 5 bar [58 - 72.5 psi].
• Move nozzle further forward.
• Unit should be filled with min. 4 - 5 kg blasting material.
• Remove sand and check / replace lead pipe.
• Replace nozzles.
• Dehydrate the compressor. Use a more powerful unit.
Extraction unit still
runs even when
blasting has been
interrupted.
• A certain run-on time is normal
in order to remove any dust still
present in the chamber.
• The switch for the external
extraction unit (Fig. 18-F) was
reactivated.
• Regulate the run-on time between 5 and 30 seconds via the control
on the back of the unit (Fig. 21).
• Switch off the external extraction unit.
Heavy dust build-up
during blasting.
• No extraction unit connected.
• Extraction power too weak.
• Connect an extraction unit.
• Close the air holes (Fig. 42-B).
• Increase extraction power.
Switch for external
extraction does not
work.
• Extraction unit is not controlled
by blasting unit.
• Connect the extraction unit power cable to the blasting
unit.