Errors; Error (Alarm) Definitions And Remedies - Mitsubishi Electric FREQROL HC Instruction Manual

3.1 ERRORS

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.

3.1.1 Error (alarm) definitions and remedies

Parameter Unit Display
(Note 4)
Stedy
Spd Oc
Inv.
Overload
Stedy
Spd Oc
Corrupt
Memory
Retry No.
Over
Inst. Pwr.
Loss
CPU Fault
Under
Voltage
Option
Fault
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
Definition
If the input current exceeds a given level
during operation of the high power factor
Overcurrent
converter, the operations of the high
protection
power factor converter and inverter are
stopped.
To protect the IPM, the electronic
over load protection is activated in
Electronic response to the high power factor
overload converter input according to the inverse-
protection time characteristics to stop the operations
of the high power factor converter and
inverter.
If the main circuit devices are heated due
Main circuit
to cooling fan stop, overload, etc., the
device heat
high power factor converter is stopped.
If any stored parameter error occurs, the
Parameter
operations of the high power factor
error
converter and inverter are stopped.
If proper operation cannot be resumed
Retr y count within the given number of retries, the
excess outputs of the high power factor converter
and inverter are stopped.
If power is restored within about 100ms
Instantaneous
after a power failure of longer than 15ms,
power failure
the operations of the high power factor
protection
converter and inverter are stopped.
If cable disconnection or other power
Power supply supply fault has occurred, the outputs of
fault the high power factor converter and
inverter are stopped.
If the CPU arithmetic does not end within
a given period, the operations of the high
CPU error
power factor converter and inverter are
stopped.
If the DC bus voltage falls below 150VAC
Undervoltage (300VAC for 400V class), the operations
protection of the high power factor converter and
inverter are stopped.
Option fault Displayed during error retry.
(option) and is not displayed on the FR-PU03E (option).
-1
Cause
Check for sudden load
variation.
Check for overload on
motor.
Check for low carrier
frequency on inverter
side. (Note 3)
Check for overload.
Check if parameters
are written too many
times.
Find the fault cause.
Find the instantaneous
power failure cause.
Check for power cable
disconnection.
Check for a start of
large-capacity motor.
- 44 -
Check Point Remedy
Eliminate sudden
variation.
Change the fan,
remove a fan
obstacle. (Note 1)
Reduce load
weight. Increase
the high power
factor converter
capacity.
Reduce load
weight.
Change the fan.
Change the high
power factor
converter.
Check power
supply system
equipment, e.g.
power capacity.