Monitoring Trip Events, History, & Conditions - Hitachi WJ200-001S Instruction Manual

68
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
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
Over-current event while at

constant speed
Over-current event during

deceleration
Over-current event during

acceleration
Over-current event during

other conditions
Overload protection

Braking resistor overload

protection
Over-voltage protection

EEPROM error

Under-voltage error

Current detection error

will clear the trip
=
Name
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.
When a motor overload is detected by the
electronic thermal function, the inverter trips and
turns OFF its output.
When the BRD operation rate exceeds
the setting of "b090", this protective
function shuts off the inverter output and
displays the error code.
When the DC bus voltage exceeds a threshold, due
to regenerative energy from the motor.
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.
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.
If an error occurs in the internal current
detection system, the inverter will shut off its
output and display the error code.
RUN
STOP
STOP
RESET
STOP
RESET
Trip
Fault
Cause(s)
RUN
Fault