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Troubleshooting & Maintenance
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12 Troubleshooting & Maintenance
12.1 Protective functions
When a fault occurs, the cause must be corrected before the fault can be cleared. If protective
function keeps active, it could lead to reduction in product life and damage to the equipment.
Fault Display and information
Keypad
display
Protective
functions
Descriptions
Overcurrent
The inverter turns off its output when the output current of the
inverter flows more than the inverter rated current.
Overcurrent2
When IGBT
’s Arm is short and output short occurs, the inverter
turns off its output
Ground fault
current
The inverter turns off its output when a ground fault occurs and
the ground fault current is more than the internal setting value
of the inverter.
Inverter
Overload The inverter turns off its output when the output current of the
inverter flows more than the rated level (120% for 1 minute).
Overload trip
The inverter turns off its output if the output current of the
inverter flows at 150% of the inverter rated current for more
than the current limit time (1 min).
Inverter
overheat
The inverter turns off its output if the heat sink overheats due
to a damaged cooling fan or an alien substance in the cooling
fan by detecting the temperature of the heat sink.
Output Phase
loss
The inverter turns off its output when the one or more of the
output (U, V, W) phase is open. The inverter detects the output
current to check the phase loss of the output.
Over voltage
The inverter turns off its output if the DC voltage of the main
circuit increases higher than 400 V when the motor
decelerates. This fault can also occur due to a surge voltage
generated at the power supply system.
Low voltage
The inverter turns off its output if the DC voltage is below 180V
because insufficient torque or overheating of the motor can
occur when the input voltage of the inverter drops.