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 Trips and Warnings
When the inverter detects a fault, it stops the operation (trips) or sends out a warning signal. When
a trip or warning occurs, the keypad displays the information briefly. If the LCD keypad is used,
detailed information is shown on the LCD display. Users can read the warning message at Pr.90.
When more than 2 trips occur at roughly the same time, the keypad (basic keypad with 7-segment
display) displays the higher priority fault trip information, while the LCD keypad shows the
information for the fault trip that occurred first.
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 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.
Displayed when inverter output current exceeds 200% of
the rated current.
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