Faults And Trouble Shooting - Husqvarna PG 820 RC 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
GRINDER IS HARD TO
HOLD ON TO
TROUBLESHOOTING
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).
Drive belt is slipping.
The belt is broken (can be checked
by turning one of the grinder disc
by hand. If all of the grinding discs
rotate together, the belt is intact. If
one grinding disc rotates freely
then the 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
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.
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