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Husqvarna PG 680 Operator's Manual Page 30

Floor grinder/polisher.
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DC link voltage (screen V1.18) is
less then 500+/- 5V when the
machine is in operation
Red light has come on at the
control panel during operation
F1.1 on display panel, Over current
F1.3 on display panel - Earth fault
F1.9 on display panel - Under
voltage
F1.11 on display panel - output
phase supervision
F1.14 on display panel - unit over
temperature
F.1.15 on display panel - motor
stalled
F1.16 on display panel - motor over
temperature
30 – English
MAINTENANCE
Poor power supply coming into the
variable speed drive
Fault codes appear on the display screen
inside the electrical cabinet
Motor worked to hard drawing extra
current
Short circuit between phases on output
side of variable speed drives
Input phase L1 missing at contactor
Internal motor failure (rare)
Short circuit between phases on output
side of variable speed drives
Motor failure (rare)
Insufficient voltage supply to machine
Power supply to variable speed drives
has been turned off
Short circuit on output side of variable
speed drives. No current in one of the
power phases at the motor.
Variable speed drives are over
temperature due to high temperature in
the working environment or broken
temperature sensor
Motor stall protection has tripped; the
motor is working too hard and is drawing
extra current
Mechanical jam between ginding discs
beneath the grinding head
Mechanical jam on the planetary drive
Motor worked to hard drawing extra
current
Check both voltage and phases to grinding
machine at the first point of output power to
the grinder, including wiring connections at
the contactor and variable speed drive input
Check the fault code on the display screen
and respond accordingly
Check that current is drawn when the
machine is running. Reduce speed setting
and current draw back into acceptable limits
as out lined in the electrical diagnostics
manual
Check wiring in plugs connected to motor
cables or inside connection boxes on
motors
Check incoming wiring at power plugs and
contactor
Have motor tested. Replace if needed.
Check wiring in plugs connected to motor
cables and inside the terminal boxes on
motors for loose earth wires
Have motor tested. Replace if needed.
Check power supply and ensure correct
voltage. Check power source at the wall
supply.
Re-connect power to grinder. Check DC-
link (screen V.1.18) in both the standby (550
+/-5) and run mode (500+/-5)
Check the wiring in the plugs connected to
motor cables and inside terminal boxes on
motors
Open door on the electrical cabinet to
increase ventilation. If needed have the
variable speed drives tested by a
Husqvarna service agent.
Check the current being drawn when the
machine is running. Reduce motor speed
settings via the potentiometers on the
control panel near the handle bars and draw
current back into acceptable working limits
according to "Monitoring Menus Output
Frequency"
Tilt the machine back and inspect the
grinding discs for foreign items. Rotate
grinding discs by hand to see if jam exists.
Ensure that all three grinding discs rotate
togehter. If one grinding discs rotate
individually a broken belt is causing an
internal jam. Contact Husqvarna service
agent.
Tilt the machine back and try to rotate the
planetary head by hand, to see if jam exists.
This should be firm but not impossible.
Remove cover and clean away any debris.
Check the current being drawn when the
machine is running. Reduce motor speed
settings via the potentiometers on the
control panel near the handle bars and draw
current back into acceptable working limits
according to "Monitoring Menus Output
Frequency"

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