Surface Technology
Oberflächentechnik
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8
16
Troubleshooting
The control unit is fi tted with an over-load cut-out switch.
If the switch in the control unit has responded, the cause is likely to be:
The handpiece or the micromotor is continually being loaded at its maximum limit. In this case
wait for about 3 to 5 seconds. It will then be possible to resume operation
Error Code
Description
Cause
Speed display does not
light.
• The power plug is disconnected.
• The fuse is blown.
• Power switch is faulty.
Speed display and set
rotation speed is displayed
repeatedly.
• Put the power switch, depressing the foot pedal.
E 1
Overcurrent detection
error.
• long-time use at a high load
• shorted cord (power line)
• shorted motor winding
E 3
Motor sensor error.
• faulty sensor
• disconnected motor cord
E 4
Unit overheat error.
• Temperature rise in the unit due to long-time use at
a high load.
• Unit placed under a high temperature.
EF
Foot pedal error.
• Faulty foot pedal or shorted foot pedal cord.
• Broken internal circuit.
The rotation speed does not rise.
• The maximum rotation speed for oper-ation by foot
pedal should be set with the speed control knob.
The attachment does not turn with the chuck
closed.
• Bearings contaminated or seized.
