Husqvarna PG820 User Manual

16 

- English

When either one of the variable speed drives or frequen-
cy converters in the machine experience a fault and “trip” 
out, they will cease to run and an error message will ap-
pear fl ashing on the keypad display (see picture below).

The following list are the most commonly experienced 
faults and possible action steps.

1—OVERCURRENT

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.

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—UNDERVOLTAGE

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 OVERTEM-
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.