Husqvarna PG 530 Workshop Manual page 7

Service checks | Faults and troubleshooting
Fault indication
[1] Over cur- Motor being worked too hard and drawing extra cur-
rent.
rent
Short circuit on output side of variable speed drives
or frequency converters.
Motor failure (very rare)
Poor voltage supply to machine will result in excess
current draw
[3] Earth fault Short circuit on output side of variable speed drives
or frequency converters.
Motor failure (very rare)
[9] Under Insufficient voltage supply to machine.
voltage
Power supply to variable speed drives or frequency
converters has been turned off.
[11] Output Short circuit on output side of variable speed drives
phase or frequency converters.
supervision
Motor failure (very rare)
[14] Unit over Variable speed drives or frequency converter over
temperature temperature due to high temperature working envir-
onment or faulty temperature sensor.
[15] Motor Motor being worked too hard and drawing extra cur-
stalled rent.
Mechanical jam preventing motor from turning.
[16] Motor over Motor being worked too hard and drawing extra cur-
temperature rent.
Grinder is hard Not enough diamonds under the machine (if grind-
ing thick glue or soft floors, too few diamonds un-
to hold onto
der the machine will greatly increase the load on
grinder and operator). Usually also accompanied by
high current draw by large motor.
Large motor not working (this can be caused by fault
with motor, fault with wiring to motor, or fault with
large variable speed drive or frequency converter).
Drive belt is slipping.
Drive belt is broken (try turning one of the grinding
heads by hand; if all rotate together, belt is not
broken, if only one turns, belt is broken).
Grinder sounds Small planetary drive motor not plugged in.
like it is over
Small motor not working (this can be caused by
revving
fault with motor, fault with wiring to the motor, or
fault with large variable speed drive or frequency
converter).
Grinder is jump- Grinding heads may be worn-out or damaged.
ing around
Diamonds may not be fitted correctly or different
height diamonds may be on the grinding heads.
Head locks may be loose or missing.
Faults and troubleshooting
Possible cause Suggested action
Check current being drawn when machine is running. Reduce speed setting
and current draw back into acceptable limits as described on previous page.
Check wiring in plugs connected to motor cables or inside connection boxes
on motors.
Have motor tested and replace if required.
Poor mains supply (under 220V) | Working off a generator
Using light duty power leads | Using more then 20m (65ft) power leads
Check wiring in plugs connected to motor cables or inside connection boxes
on motors.
Have motor tested and replace if required.
Check power supply and ensure correct voltage.
Re-connect power to grinder.
Check wiring in plugs connected to motor cables or inside connection boxes
on motors.
Have motor tested and replace if required.
Open door on electrical cabinet to increase ventilation.
Have variable speed drives or frequency converter tested by service agent.
Check current being drawn when machine is running. Reduce speed setting
and current draw back into acceptable limits as described on previous page.
Try rotating grinding discs and planetary head by hand to see if jam exists
Check current being drawn when machine is running. Reduce speed setting
and current draw back into acceptable limits as described on previous page.
Increase number of diamonds under machine to reduce load on grinder and
operator.
Check large motor is plugged in. Check there are no faults on larger variable
speed drive or frequency converter. Check that large variable speed drive or fre-
quency converter is on. Check that large variable speed drive or frequency con-
verter is functioning properly (unplug both motors, set display on keypad to
Output Frequency, switch machine to RUN, see if numbers on screen change
from zero and begin counting up. If numbers stay on zero, large variable speed
drive or frequency converter is not receiving run command from switch on
control panel. Machine needs to be checked by an electrician or by Husqvarna
Construction Products.
Remove belt tensioner cover plate on bottom of machine and check there is
no water or dust on the inside of the machine that may be causing the belt to
slip on the drive pulleys.
Replace internal drive belt.
Check small planetary drive motor is plugged in.
Check small motor is plugged in. Check there are no faults on small variable
speed drive or frequency converter. Check that small variable speed drive and
frequency converter is on. Check that small variable speed drive or frequency
converter is functioning properly (unplug both motors, set display on keypad
to Output Frequency, switch machine to RUN, see if numbers on screen
change from zero and begin counting up. If numbers stay on zero, small vari-
able speed drive or frequency converter is not receiving run command from
switch on control panel. Machine needs to be checked by an electrician or
Husqvarna Construction Products.
Check grinding heads for broken parts or excess movement.
Check to ensure all diamonds are fitted correctly and are the same height.
Check to ensure all head locks are present and tight.
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