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3.1 ERRORS
3.1.1 Error (alarm) definitions and remedies
Note: 1.This alarm does not occur if the cooling fan stops, but it will occur to prevent the main circuit devices
from overheating due to the cooling fan stopping.
2.If the alarm is still displayed on the parameter unit after remedy, the internal circuit may be faulty.
Consult your sales representative.
3.For the E.THT error, the electronic overcurrent protection of the inverter should activate earlier than
that of the high power factor converter. However, the inverter’s electronic overcurrent protection
“E.THT” has the property that it is activated earlier at a higher carrier frequency and later at a lower
carrier frequency. Therefore, when the carrier frequency of the inverter is low, the electronic
overcurrent protection of the high power factor converter may be activated earlier.
4.Displayed on the FR-PU02E
-1
(option) and is not displayed on the FR-PU03E (option).
Parameter Unit Display
(Note 4)
Definition Cause Check Point Remedy
Stedy
Spd Oc
Overcurrent
protection
If the input current exceeds a given level
during operation of the high power factor
converter, the operations of the high
power factor converter and inverter are
stopped.
Check for sudden load
variation.
Eliminate sudden
variation.
Change the fan,
remove a fan
obstacle. (Note 1)
Inv.
Overload
Electronic
overload
protection
To protect the IPM, the electronic
overload protection is activated in
response to the high power factor
converter input according to the inverse-
time characteristics to stop the operations
of the high power factor converter and
inverter.
Check for overload on
motor.
Check for low carrier
frequency on inverter
side. (Note 3)
Reduce load
weight. Increase
the high power
factor converter
capacity.
Stedy
Spd Oc
Main circuit
device heat
If the main circuit devices are heated due
to cooling fan stop, overload, etc., the
high power factor converter is stopped.
Check for overload.
Reduce load
weight.
Change the fan.
Corrupt
Memory
Parameter
error
If any stored parameter error occurs, the
operations of the high power factor
converter and inverter are stopped.
Check if parameters
are written too many
times.
Change the high
power factor
converter.
Retry No.
Over
Retry count
excess
If proper operation cannot be resumed
within the given number of retries, the
outputs of the high power factor converter
and inverter are stopped.
Find the fault cause.
Inst. Pwr.
Loss
Instantaneous
power failure
protection
If power is restored within about 100ms
after a power failure of longer than 15ms,
the operations of the high power factor
converter and inverter are stopped.
Find the instantaneous
power failure cause.
Power supply
fault
If cable disconnection or other power
supply fault has occurred, the outputs of
the high power factor converter and
inverter are stopped.
Check for power cable
disconnection.
CPU Fault CPU error
If the CPU arithmetic does not end within
a given period, the operations of the high
power factor converter and inverter are
stopped.
Under
Voltage
Undervoltage
protection
If the DC bus voltage falls below 150VAC
(300VAC for 400V class), the operations
of the high power factor converter and
inverter are stopped.
Check for a start of
large-capacity motor.
Check power
supply system
equipment, e.g.
power capacity.
Option
Fault
Option fault Displayed during error retry.
If any fault has occurred with the high power factor converter, the corresponding protective
function is activated to bring the high power factor converter to an alarm stop and
automatically give the corresponding error (alarm) indication on the parameter unit display.
When the protective function is activated, refer to page 42 on how to reset the converter.