9 Troubleshooting
This chapter explains how to troubleshoot a problem when inverter protective
functions, fault trips, warning signals, or a fault occurs. If the inverter does not work
normally after following the suggested troubleshooting steps, please contact the LSIS
customer service center.
9.1 Trip and Warning
When the inverter detects a fault, it stops the operation (trips) or sends out a warning
signal. When a trip or warning occurs, trip information and warning information will be
briefly displayed on the keypad. Users can read the warning message at Pr.90. If two
or more trips occur, the trip information with a higher priority will be displayed first on
the keypad.
The fault conditions can be categorized as follows:
• Level: When the fault is corrected, the trip or warning signal disappears and the
fault is not saved in the fault history.
• Latch: When the fault is corrected and a reset input signal is provided, the trip or
warning signal disappears.
• Fatal: When the fault is corrected, the fault trip or warning signal disappears only
after the user turns off the inverter, waits until the charge indicator light goes off,
and turns the inverter on again. If the inverter is still in a fault condition after
powering it on again, please contact the supplier or the LSIS customer service
center.
9.1.1 Fault Trips
Protection Functions for Output Current and Input Voltage
Displayed when the motor overload trip is
activated and the actual load level exceeds the set
level. Operates when Pr.20 is set to a value other
than 0.
Displayed when the motor underload trip is
activated and the actual load level is less than the
set level. Operates when Pr.27 is set to a value
other than 0.
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