LS Starvert-iG5A - Protective Functions; Current-Based Protection; Voltage and Braking Protection; Fault Trip Troubleshooting

Over current2
(Arm short)
 IGBT phase to phase fault.
 There is a short circuit in
the wiring on the output
side.
 Motor oput cables are too
long.
 Surge voltages occur at
the output terminals.
 Check for a phase to
phase short circuit at the
the IGBT.
 Check the output cables.
 Use the correct length for
motor cables.
 Reduce the carrier
frequency.
 Resolve the surging
voltage condition.
Display Cause Remedy
Over
current
 Deceleration time is too
short.
 The inverter output current
exceeds the rated
capacity.
 The motor’s mechanical
brake is operating
improperly.
 Over current occurs when
the inverter power is
turned on.
 The actual current value is
different from the value
displayed.
 Set the Acc/Dec time.
 Decrease the load or
replace the inverter with a
higher-rated model.
 Check the mechanical
brake.
 Adjust the torque boost.
 Contact the supplier.
Type
Trip
Name
Function
Description
Current
OCT
Over
Current
Inverter output current exceeds 200 % of the
rated current.
OC2
Over
current
Inverter detects a IGBT Arm short circuit or an
output short circuit.
OLT
Over
load
The current value exceeds the motor’s rated
current. (Default value = 180 % of the motor’s
rated current)
GFT
Ground
trip
The sum of 3 phases current(Normal 0V) is
higher than the level which is set and flowing
through inverter output for the setting time.
IOLT
Inverter
over
load
The inverter is operating at 150 % of the rated
current for more than 60 sec or at 200 % of
the rated current for 10 sec (this feature has
inverse time characteristics).
ETH
Electronic
thermal
Stops the inverter operation to protect the
motor when a current exceeding the motor
rated current is supplied for a specific period
of time (Default value = 150 % of the motor’s
rated current detected for 60 sec. This feature
has inverse time characteristics).
The inverter output current exceeds the
motor’s rated current
Voltage
OVT
Over
voltage
The internal DC circuit voltage exceeds the
specified value.
200 V: 400 Vdc
400 V: 820 Vdc
LVT
Low
voltage
The internal DC circuit voltage is less than the
specified value.
200 V: 180 Vdc (Reset level: 230 Vdc)
400 V: 360 Vdc (Reset level: 460 Vdc)
-
Braking
operation
IGBT braking is turned on as DC voltage has
combined with regenerated voltage and
exceeds the specified voltage.
Turn On: 200 Vdc-390 Vdc , 400 Vdc-780 Vdc
Turn Off: 200 Vdc-380 Vdc , 400 Vdc-760 Vdc
Protective functions Fault trip troubleshooting
Over heat
Fan trip
 Cooling system fault.
 Cooling fan fault.
 The ambient temperature
around the panel is too
high.
 The carrier frequency is
too high.
 Check that foreign objects
are obstructing the vent.
 Replace the cooling fan.
 Reduce the ambient
temperature to below 50
℃.
 Reduce the carrier
frequency.
Note
Cooling fan faults can be inspected by sound and
the exterior condition. If the fan is malfunctioning,
it may damage the inverter.
Ground trip
 A ground fault has
occurred in the output side
of the inverter.
 Phase to phase difference
of output voltage has
occurred.
 The motor’s insulation is
damaged.
 Check the output cables.
 Check the voltages
between the phases are
balanced.
 Check the motor’s
insulation resistance.
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