LSIS 6731001500, User Manual

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Troubleshooting
562
LCD Display Type Description
Under Load Latch
Displayed when the motor underload trip is activated and the
actual load level is less than the set level. Operates when PRT-27 is
set to a value other than ‘0’.
Over Current1 Latch
Displayed when inverter output current exceeds 180% of the rated
current.
Over Voltage Latch
Displayed when internal DC circuit voltage exceeds the specified
value.
Low Voltage Level
Displayed when internal DC circuit voltage is less than the specified
value.
Low Voltage2 Latch
Displayed when internal DC circuit voltage is less than the specified
value during inverter operation.
Ground Trip Latch
Displayed when a ground fault trip occurs on the output side of the
inverter and causes the current to exceed the specified value. The
specified value varies depending on inverter capacity.
E-Thermal Latch
Displayed based on inverse time-limit thermal characteristics to
prevent motor overheating. Operates when PRT-40 is set to a value
other than ‘0’.
Out Phase Open Latch
Displayed when a 3-phase inverter output has one or more phases
in an open circuit condition. Operates when bit 1 of PRT-05 is set to
‘1’.
In Phase Open Latch
Displayed when a 3-phase inverter input has one or more phases in
an open circuit condition. Operates only when bit 2 of PRT-05 is set
to ‘1’.
Inverter OLT Latch
Displayed when the inverter has been protected from overload and
resultant overheating, based on inverse time-limit thermal
characteristics. Allowable overload rates for the inverter are 120%
for 1 min and 140% for 5 sec.
No Motor Trip Latch
Displayed when the motor is not connected during inverter
operation. Operates when PRT-31 is set to ‘1’.
Protection Functions Using Abnormal Internal Circuit Conditions and External Signals
LCD Display Type Description
Over Heat Latch Displayed when the temperature of the inverter heat sink exceeds