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13. Troubleshooting & Maintenance
13-1 SV-iC5
13. Troubleshooting & Maintenance
13.1 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
200% of the inverter rated current.
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 (150% 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).
Heat sink
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.
DC link
capacitor
overload
The inverter turns off its output when it is time to replace the old DC link capacitor to a
new one.
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.
Electronic
Thermal
The internal electronic thermal of the inverter determines the overheating of the motor. If
the motor is overloaded the inverter turns off the output. The inverter cannot protect the
motor when driving a motor having more than 4 poles or multi motors.
Parameter
save error
This fault message is displayed when user-setting parameters fails to be entered into
memory.
WARNING