Shark S460, Safety & Operator Manual, Page: 9 / 21

SHARK CONCRETE GRINDERS
9
Problem Solving
Error C ode Cause
Remedy
GFF
Ground Fault
Ground fault protection circuit action.
When ac motor drives measure the output
ground and the grounding power is more
than 50% than the rated current of ac
motor drive.
Note: The protection system aims at ac
motor driver instead of the human body.
1.Check if there is a short circuit
phenomenon or ground connection.
2.Confirm if IGBT power modules are
damaged or not.
3. Check the connection of side is
defective insulation or not.
LVA/LVN
Lvat Accel
The voltage of ac motor drive measuring
internal dc high voltage side is lower than
06-00 when accelerating. 1. Check if the input power and voltage
are normal or not.
2. Check if there is a sudden heavy load.
Orp
Phase Lacked
Phase lacked protection 1. Check the input power correct or not.
2. Check if machine is larger than 40HP.
If yes, check AC breaker is melting or not.