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[ 18 ]
erf
Data saving error during undervoltage
Problem
The inverter failed to save data such as the frequency commands, PID commands,
timer values for timer operation (which are specified through the keypad) or the output
frequencies modified by the
UP
/
DOWN
terminal commands when the power was
switched OFF.
Possible Causes
What to Check and Suggested Measures
(1) During data saving
performed when the
power was turned OFF,
the voltage fed to the
control PCB dropped in
an abnormally short
period due to the rapid
discharge of the DC link
bus.
Check how long it takes for the DC link bus voltage to drop to the
preset voltage when the power is turned OFF.
Î
Remove whatever is causing the rapid discharge of the DC link
bus voltage. After pressing the
key and resetting the alarm,
revert the data of the relevant function codes (such as the
frequency commands, PID commands, timer values for timer
operation (specified through the keypad) or the output
frequencies modified by the
UP
/
DOWN
terminal commands)
back to the original values and then restart the operation.
(2) Inverter affected by
strong electrical noise
during data saving
performed when the
power was turned OFF.
Check if appropriate noise control measures have been
implemented (e.g., correct grounding and routing of control and
main circuit wires).
Î
Implement noise control measures. After pressing the
key
and resetting the alarm, revert the data of the relevant function
codes (such as the frequency commands, PID commands, timer
values for timer operation (specified through the keypad) or the
output frequencies modified by the
UP
/
DOWN
terminal
commands) back to the original values and then restart the
operation.
(3) The control circuit failed.
Check if
erf
occurs each time power is switched ON.
Î
The control PCB (on which the CPU is mounted) is defective.
Contact your Fuji Electric representative.
[ 19 ]
err
Mock alarm
Problem
The LED displays the alarm
err
.
Possible Causes
What to Check and Suggested Measures
(1) Data of the function
code H45 has been
set to "1."
This setting makes the inverter issue a mock alarm. Use this to
check out the sequence related to an alarm occurrence.
Î
To escape from this alarm state, press the
key.