Hitachi CONVENTION 14 instruction manual 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,
recording 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.
Error
Code Name Cause(s)
E01 Over-current event while at
constant speed
E02 Over-current event during
deceleration
E03 Over-current event during
acceleration
E04 Over-current event during
other conditions
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.
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
threshold 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.
E11 CPU error A malfunction in the built-in CPU has occurred, so
the inverter trips and turns OFF its output to the
motor.
E12 External trip A signal on an intelligent input terminal configured
as EXT has occurred. The inverter trips and turns
OFF the output to the motor.
Run Stop
RUN
STOP
RESET
Trip
STOP
RESET
Fault Fault
65
Troubleshooting and
Maintenance
6 5
Troubleshooting and
Maintenance