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Husqvarna PG 680 Operator's Manual: Faults And Trouble Shooting

Floor grinder/polisher.
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Faults and trouble shooting

The following table outlines some of the problems that may be experienced when using the PG grinders and a list of
potential solutions.
Problem
Possible Cause
Not enough diamonds under the machine
(if grinding thick glue or soft floors, too few
diamonds under 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).
GRINDER IS
HARD TO
HOLD ON TO
Drive belt is slipping.
Drive belt is broken (this can be confirmed
by turning one of the grinding heads by
hand. If all grinding heads rotate together,
belt is not broken. If only one grinding head
turns, belt is broken).
Only 1 phase is coming into the machine,
machine will not fault and will draw <1 amp
motor current, fan will be turning slowly.
The application or the use of the machine
requires too much of the machine capacity
Small planetary drive motor not plugged
in.
Small motor not working (this can be
GRINDER
caused by fault with motor, fault with wiring
SOUNDS
to the motor, or fault with small variable
LIKE IT IS
speed drive or frequency converter).
OVER-
REVVING
The large motor is not working. This can be
caused by fault with motor, fault with wiring
to motor, or fault with large variable speed
drive.
MAINTENANCE
Potential Solution
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 frequency converter is on. Check that large
variable speed drive or frequency converter is func tioning 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 incoming power supply.
In some applications even when the right number and type of
diamonds have been selected, it can still be necessary to slow down
both the motors speeds and the forward speed of the machine
across the floor.
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 variable speed
drive or frequency converter is not receiving run command from
witch on control panel. Machine needs to be checked by an
electrician or Husqvarna Construction Products.
Check that there are no faults on either the small or the large
variable speed drives. Reset if required at the control panel on the
handle bar.
English – 27

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