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

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
caused by fault with motor, fault with
GRINDER
wiring to the motor, or fault with small
SOUNDS LIKE
variable speed drive or frequency
IT IS OVER-
converter).
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 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 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