FujiFilm Frenic-Mini Instruction Manual page 137

Possible Causes
(6) Conditions for
communications differ
between the inverter and
host controllers.
(7) The RS485
communications card
malfunctioned.
E F
[ 17 ] Data save error during undervoltage
Problem The inverter was unable to save data such as the frequency commands, timer,
and PID process commands set through the keypad when the power was
switched off.
Possible Causes
(1) The control circuit voltage
dropped suddenly while
the data was being saved
when the power was
turned off, because the
electric charge in the DC
bus capacitor was rapidly
discharged.
(2) A high intensity noise was
given to the inverter while
data was being written
when the power was
turned off.
(3) The CPU did not operate
normally.
What to Check and Suggested Measures
Compare the settings of the y codes (y01 to y10) with those of
the host controllers.
Correct any settings which differ.
Replace the card.
What to Check and Suggested Measures
Check how long it takes for the DC link circuit voltage to drop
to the preset voltage when the power is turned off.
Remove whatever is causing the rapid discharge of the
electric charge. After pressing the
the alarm, reset the data (such as the frequency
commands, timer, and PID process commands) set with
the keypad to the correct settings and then restart the
motor.
Check if appropriate noise control measures have been
implemented (e.g., correct grounding and routing of control
and main circuit wires).
Improve noise control. Press the
alarm, then reset the data (e.g., frequency commands,
timer, and PID process commands) set through the keypad
to the correct settings. Restart the motor.
Check if E F occurs each time the power is switched off.
This problem was caused by a printed circuit board (PCB)
(including the CPU) malfunction, so it is necessary to
replace the PCB.
6-18
key and releasing
key to release the