Fault Tracing - HTC 950 RX Manual

Fault tracing

The grinder does not go into standby mode when the
key is turned.
Check that the grinder has the correct feed, that all fuses
are intact and that the earth fault breaker has not tripped.
Try putting the grinder in standby mode without connecting
it to the mains. If this is not possible, a fuse in the grinder's
electrical cabinet needs replacing.
The grinder does not start but remains in standby
mode.
Check for any error messages (see pages 34-37) and ac-
companying actions on the frequency converter display.
The machine shuts down when I run it manually.
Check for any error messages (see pages 34-37) and ac-
companying actions on the frequency converter display.
The machine shuts down when I run it using the radio
control.
Sometimes other equipment can jam radio signals between
the grinder and the radio control. If this happens, COM ER-
ROR will flash on the grinder. When contact between the
radio control and the grinder has been broken for a long
period, the grinder will shut down for safety reasons. To fix
this, restart or if necessary switch off the interfering equip-
ment.
Com error flashes on and off.
This could be quite normal if other radio signals in the
relevant frequency band are being sent in the vicinity.
Sometimes items of equipment can jam each other and the
grinder will shut down for safety reasons.
The overload lamp lights as soon as i try running a bit
faster.
The overload lamp will give a warning to the operator when
he exceeds the motor's rated current. The frequency con-
verter can give more power than the motor can handle, but
will shut down after a while to protect the motor from dam-
age. Things that influence whether the overload lights or
not include, speed, mains voltage and the position of the
weights on the grinder.
The grinder runs unevenly
If the grinder runs unevenly, this could be due to the grind-
ing holders being worn or a belt needing to be replaced.
The machine runs evenly but leaves different grinding
patterns.
This may happen if the upper belt has come off. Test by
spinning the large disc that holds all the small grinding
discs. If it spins freely the upper belt has come off and must
be replaced.
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