Operating Instructions
2-45D
Fault diagnosis
2
9.1 Fault diagnosis - blast machine
Prior to any repair works on the machine or its drives the
machine must be secured against unintentional switching-on.
Put the machine to its Safety off position
.
Fault diagnosis
Possible cause
Remedy
Unusual noises
Too little play or poor
alignment of the rotating
parts.
Check alignment of the rotating
parts (blast wheel and control
cage).
Reduced or no
blasting
performance
Inadequate abrasive supply
to the blast wheel.
Clean wire mesh, top up abrasive
if necessary.
Feeding of abrasive -
magnetic valve and
abrasive storage hopper.
Check and clean blocked feed
spout or magnetic valve.
Incorrect setting or control
cages.
Move the blast head of the blast
machine onto a 5-8 mm thick steel
plate and blast for 45 seconds at
full power without moving the
machine from the spot.
Move the machine from the blast
zone and carefully inspect the
steel plate. Adjust the control
cage until the hot spot is exactly in
the middle of the blast pattern.
When a concrete surface is to be
blasted, check the blast pattern
again after some meters and re-
adjust slightly if necessary. The
blast pattern will change with an
increased wear of the tune-up kit
and when the size of the
employed abrasive is changed.
Worn blast wheel or control
cage.
Replace if necessary.
Incorrect adjustment of the
magnetic valve.
Check the adjustment of the
magnetic valve.
Incorrect adjustment of the
blast wheel speed.
Make sure that the blast wheel
speed under load is approx. 4000
RPM.
