Data Saving Error During Undervoltage; Mock Alarm - Fuji Electric FRN0001C2S-2A FRN0002C2S-2A FRN0004C2S-2A FRN0006C2S-2A FRN0010C2S-2A FRN0012C2S-2A FRN0020C2S-2A FRN0025C2S-2A FRN0033C2S-2A FR Instruction Manual

[ 19 ]

Data saving error during undervoltage

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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
(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.
(2) Inverter affected by
strong electrical noise
during data saving
performed when the
power was turned OFF.
(3) The control circuit failed.
[ 20 ]

Mock alarm

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Problem The LED displays the alarm
Possible Causes
(1) Data of the function
code H45 has been
set to "1."
What to Check and Suggested Measures
Check how long it takes for the DC link bus voltage to drop to the
preset voltage when the power is turned OFF.
 Remove whatever is causing the rapid discharge of the DC link
bus voltage. After pressing the
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.
Check if appropriate noise control measures have been
implemented (e.g., correct grounding and routing of control and
main circuit wires).
 Implement noise control measures. After pressing the
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.
Check if occurs each time power is switched ON.
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 The control PCB (on which the CPU is mounted) is defective.
Contact your Fuji Electric representative.
.
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What to Check and Suggested Measures
This setting makes the inverter issue a mock alarm. Use this to
check out the sequence related to an alarm occurrence.
 To escape from this alarm state, press the
6-22
key and resetting the alarm,
key.
key