the host controllers.
Î Correct any settings which differ.
(7) The RS485
communications card
malfunctioned.
Î Replace the card.
[ 17 ]
E F
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 What to Check and Suggested Measures
(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.
Check how long it takes for the DC link circuit voltage to drop to
the preset voltage when the power is turned off.
Î Remove whatever is causing the rapid discharge of the
electric charge. After pressing the
key and releasing 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.
(2) A high intensity noise was
given to the inverter while
data was being written
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 Improve noise control. Press the
key to release 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.
(3) The CPU did not operate
normally.
Check if E F occurs each time the power is switched off.
Î This problem was caused by a printed circuit board (PCB)
(including the CPU) malfunction, so it is necessary to
replace the PCB. Contact IMO.
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