Troubleshooting Guide - Renfert Vario Jet Mode D'emploi

14. Troubleshooting Guide

Fault Cause
Unit doesn't blast, •
warning lamp flashing.
•
•
Air flow present but no •
sand coming through.
•
•
No air, no sand. •
On/Off switch doesn't
•
work.
•
Basket shakes,
•
doesn't move.
Blasting chamber gets •
too dusty.
•
Consumption of blast- •
ing material too high.
Objects fall out of the •
basket.
Blasting time too long •
/ reduced blasting
effect.
•
•
•
•
•
•
Extraction unit still •
runs even when
blasting has been
interrupted.
•
Heavy dust build-up •
during blasting.
•
Switch for external •
extraction does not
work.
EN
Glass pane is not closed.
Magnet (Fig. 42-A) is missing.
Protective switch is defect.
Amount of sand too low.
Filter on suction point of suc-
tion pipe is blocked.
Suction pipe defect.
Nozzle is blocked.
No power connection.
Unit fuse (Fig. 13-B) is defect.
Basket is stuck mechanically.
Too little suction power.
Extraction unit blocked.
Suction power is too high.
Too many objects.
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.
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.
No extraction unit connected.
Extraction power too weak.
Extraction unit is not controlled
by blasting unit.
Remedy
• Close the pane.
• Replace the magnet (see spare parts list).
• Exchange during service.
• Fill with more sand.
• Clean the filter.
• Exchange the suction pipe.
• Open the blasting nozzle unit (Fig. 15-A) and clean the nozzle.
• Connect to the power supply.
• Change fuse (Fig. 13-B) - replacement fuse in set. If it happens
again >>> repair.
• Release by removing and replacing the basket.
• 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.
• Reduce suction power.
Warning: too little suction power can lead to dirty blasting material.
• Reduce to a maximum of 6 objects.
• 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.
• 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.
• Connect an extraction unit.
• Close the air holes (Fig. 42-B).
• Increase extraction power.
• Connect the extraction unit power cable to the blasting
unit.
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