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Faults and trouble shooting
When either one of the variable speed drives or frequency
converters in the machine experience a fault and “trip” out,
they will cease to run and an error message will appear
fl ashing on the keypad display (see picture below).
The following list are the most commonly experienced faults
and possible action steps.
Fault Code Possible Cause Action
1—OVER CURRENT Motor being worked too hard and
drawing extra current.
Check current being drawn when machine is
running. Reduce speed setting and current draw
back into acceptable limits as described on
previous page.
Short circuit on output side of vari-
able speed drives or frequency con-
verters.
Check wiring in plugs connected to motor cables
or inside connection boxes on motors.
Motor failure (very rare) Have motor tested and replace if required.
Poor voltage supply to machine will
result in excess current draw
See comments on page 10
3—EARTH FAULT Short circuit on output side of vari-
able speed drives or frequency con-
verters.
Check wiring in plugs connected to motor cables
or inside connection boxes on motors.
Motor failure (very rare) Have motor tested and replace if required.
9—UNDER VOLTAGE Insuffi cient voltage supply to ma-
chine.
Check power supply and ensure correct voltage.
Power supply to variable speed
drives or frequency converters has
been turned off.
Re-connect power to grinder.
11—OUTPUT PHASE
SUPERVISION
Short circuit on output side of vari-
able speed drives or frequency con-
verters.
Check wiring in plugs connected to motor cables
or inside connection boxes on motors.
Motor failure (very rare) Have motor tested and replace if required.
14—UNIT OVER TEM-
PERATURE
Variable speed drives or frequency
converter over temperature due to
high temperature working environ-
ment or faulty temperature sensor.
Open door on electrical cabinet to increase ven-
tilation. Have variable speed drives or frequency
converter tested by service agent.
15—MOTOR STALLED Motor being worked too hard and
drawing extra current.
Check current being drawn when machine is
running. Reduce speed setting and current draw
back into acceptable limits as described on
previous page.
Mechanical jam preventing motor
from turning.
Try rotating grinding discs and planetary head by
hand to see if jam exists
16 - MOTOR OVER TEM-
PERATURE
Motor being worked too hard and
drawing extra current.
Check current being drawn when machine is
running. Reduce speed setting and current draw
back into acceptable limits as described on
previous page.
Fault code
Faults and trouble shooting