Husqvarna PG820 - Manual (Page 15)

English - 17
Further problems that may be experienced when using the grinder and potential solutions are as follows:
Problem Possible Cause Potential Solution
GRINDER IS HARD TO HOLD
ONTO Not enough diamonds under the
machine (if grinding thick glue or
soft fl oors, 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. Increase number of diamonds under machine to
reduce load on grinder and operator.
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 fre-
quency converter). 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 mo-
tors, set display on keypad to Output Frequency,
switch machine to RUN, see if numbers on screen
change from zero and begin counting up. If num-
bers 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
Drive belt is slipping. 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.
Drive belt is broken (this can be
confi rmed by turning one of the
grinding heads by hand. If all grind-
ing heads rotate together, belt is not
broken. If only one grinding head
turns, belt is broken). Replace internal drive belt.
GRINDER SOUNDS LIKE IT IS
OVERREVVING Small planetary drive motor not
plugged in. Check small planetary drive motor is plugged in.
Small motor not working (this can
be caused by fault with motor, fault
with wiring to the motor, or fault
with large variable speed drive or
frequency converter). Check small motor is plugged in. Check there are
no faults on small variable speed drive or fre-
quency 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 num-
bers 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 Construc-
tion Products.
GRINDER IS JUMPING AROUND Grinding heads may be worn-out or
damaged. Check grinding heads for broken parts or excess
movement.
Diamonds may not be fi tted cor-
rectly or different height diamonds
may be on the grinding heads. Check to ensure all diamonds are fi tted correctly
and are the same height.
Head locks may be loose or miss-
ing. Check to ensure all head locks are present and
tight.
Faults and trouble shooting