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L2002 Inverter
Troubleshooting
and Maintenance
6–5
Monitoring Trip Events, History, & Conditions
Fault Detection and Clearing
The microprocessor in the inverter detects a variety
of fault conditions and captures the event, record-
ing it in a history table. The inverter output turns
OFF, or “trips” similar to the way a circuit breaker
trips due to an over-current condition. Most faults
occur when the motor is running (refer to the
diagram to the right). However, the inverter could
have an internal fault and trip in Stop Mode. In
either case, you can clear the fault by pressing the Stop/Reset key. Additionally, you can
clear the inverter’s cumulative trip history by performing the procedure “
Restoring
Factory Default Settings” on page 6–8 (setting B084=00 will clear the trip history but
leave inverter settings intact).
Error Codes
An error code will appear on the display automatically when a fault causes the inverter to
trip. The following table lists the cause associated with the error.
Run Stop
Trip
Fault
Fault
STOP
RESET
STOP
RESET
RUN
Error
Code
Name Cause(s)
E01
Over-current event while
at constant speed
The inverter output was short-circuited, or the motor
shaft is locked or has a heavy load. These conditions
cause excessive current for the inverter, so the inverter
output is turned OFF.
The dual-voltage motor is wired incorrectly.
E02
Over-current event during
deceleration
E03
Over-current event during
acceleration
E04
Over-current event during
other conditions
E05
Overload protection When a motor overload is detected by the electronic
thermal function, the inverter trips and turns OFF its
output.
E07
Over-voltage protection When the DC bus voltage exceeds a threshold, due to
regenerative energy from the motor.
E08
EEPROM error When the built-in EEPROM memory has problems
due to noise or excessive temperature, the inverter
trips and turns OFF its output to the motor.
E09
Under-voltage error A decrease of internal DC bus voltage below a thresh-
old results in a control circuit fault. This condition can
also generate excessive motor heat or cause low
torque. The inverter trips and turns OFF its output.
E1 1
E22
CPU error A malfunction in the built-in CPU has occurred, so
the inverter trips and turns OFF its output to the
motor.