9. Troubleshooting and Maintenance
9-1
Chapter 9 – Troubleshooting and Maintenance
9.1 Fault Display
CAUTION
When a fault occurs, the inverter turns off its output and displays the fault status described
below. In this case, 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.
Protective
function
Keypad display Description
Over Current
OC-U
OC-V
OC-W
The inverter turns off its output when the output current of the inverter flows more
than 200% of the inverter rated current.
Ground Fault
Protection
Ground Fault
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. Over current trip
function may protect the inverter when a ground fault occurs due to a low ground
fault resistance
Over voltage
protection
Over Voltage
he inverter turns off its output if the DC voltage of the main circuit increases higher
than the rated value (200V class: 400V DC, 400V class: 820 V DC) 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.
Low Voltage
Protection
Low Voltage
The inverter turns off its output if the DC voltage is below the detection level
because insufficient torque or over heating of the motor can occurs when the input
voltage of the inverter drops.
Overload
Protection
Over Load
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).
Inverter
Overload
Inv OLT
The inverter turns off its output when the rated current of the inverter flows more
than regulation level(150% for 1 minute-Inversely proportional to time).
InvOver 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.
Heat Sink
Over Heat
OHD Open
*1)
The inverter turns off its output when OHD is opened and the heat sink is
overheated.
Inverter NTC
Thermistor
Open
InvThem OP When inverter NTC Thermistor is open, inverter stops its output.
Motor overheat MotOver Heat
When motor temp exceeds 150℃ , inverter stops its output to protect motor from
overheated.
Motor
Thermistor Error
MotThem Err
When there is an error in Thermistor that measures the temperature of motor,
inverter stops its output. (Error—NTC: open , PTC: short-circuit)
Electronic
Thermal
E-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.
External fault B Ext Trip-B Use this function if the user needs to turn off the output by an external fault signal.
*1) It only comes under SV2800~3750iV5.
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