Problem Solving - Shark S640 Safety & Operator Manual

Error Code
GFF
Ground Fault
LVA/LVN
Lvat Accel
Orp
Phase Lacked
SHARK CONCRETE GRINDERS

Problem Solving

Cause
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.
The voltage of ac motor drive measuring
internal dc high voltage side is lower than
06-00 when accelerating.
Phase lacked protection
Remedy
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.
1. Check if the input power and voltage
are normal or not.
2. Check if there is a sudden heavy load.
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.
9