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CHAPTER 6 - TROUBLESHOOTING & MAINTENANCE
6.1 Fault Display
When a fault occurs, the inverter turns off its output and displays the fault status in DRV-07. The last 5
faults are saved in FU2-01 through FU2-05 with the operation status at the instance of fault.
Display
Protective
Function
Description
Over Current
Protection
The inverter turns off its output when the output current of the inverter flows more than
200% of the inverter rated current.
Over Voltage
protection
The inverter turns off its output if the DC voltage of the main circuit increases higher than
the rated value when the motor decelerates or when regenerative energy flows back to the
inverter due to a regenerative load. This fault can also occur due to a surge voltage
generated at the power supply system.
Current Limit
Protection
(Overload
Protection)
The inverter turns off its output if the output current of the inverter flows at 180%
of the
inverter rated current for more than the current limit time (S/W).
Heat Sink
Over Heat
The inverter turns off its output if the heat sink over heats due to a damaged cooling fan or
an alien substance in the cooling fan by detecting the temperature of the heat sink.
Electronic Thermal
The internal electronic thermal of the inverter determines the over heating of the motor. If
the motor is overloaded the inverter turns off the output. The inverter cannot protect the
motor when driving a multi-pole motor or when driving multiple motors, so consider
thermal relays or other thermal protective devices for each motor.
Overload capacity: 150% for 1 min
Low Voltage
Protection
The inverter turns off its output if the DC voltage is below the detection level. Insufficient
torque or over heating of the motor can occurs when the input voltage of the inverter
drops.
Input Phase Open
The inverter turns off the output when one or more of the input(R, S, T) phase is open and
the output load is over 50% of the inverter rated current for more than 1 minute. The
inverter checks whether the phase is open by detecting the DC voltage of the main circuit.
Output Phase Open
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 open of the output.
BX Protection
(Instant Cut Off)
Used for the emergency stop of the inverter. The inverter instantly turns off the output
when the BX terminal is turned ON, and returns to regular operation when the BX terminal
is turned OFF. Take caution when using this function.
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-Inversely proportional to time).
External Fault A
Use this function if the user needs to turn off the output by an external fault signal.
(Normal Open Contact)
External Fault B
Use this function if the user needs to turn off the output by an external fault signal.
(Normal Close Contact)
Operating Method
when the
Frequency
Reference is Lost
According to I/O-48 [Operating Method when the Frequency Reference is Lost], there are
3 modes: continue operation, decelerate and stop, and free run.