Fuji Electric FRENIC-Ace series, Руководство пользователя

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6.3 If an Alarm Code Appears on the LED Monitor
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Chap 6
[ 17 ]
erf
Data saving error during undervoltage
Phenomena The inverter failed to save data such as the frequency commands and PID commands (which are
specified through the keypad), or the output frequencies modified by the UP/DOWN signal
commands when the power was turned OFF.
Possible Causes Check and 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
intermediate circuit.
Check how long it takes for the DC intermediate circuit voltage to drop to
the preset voltage when the power is turned OFF.

Remove whatever is causing the rapid discharge of the DC
intermediate circuit voltage. After pressing the key and
releasing the alarm, return the data of the relevant function codes
(such as the frequency commands and PID commands (specified
through the keypad) or the output frequencies modified by the
UP/DOWN signal commands) back to the original values and then
restart the operation.
(2) The inverter operation was
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).

Implement noise control measures. After pressing the key and
releasing the alarm, return the data of the relevant function codes
(such as the frequency commands and PID commands (specified
through the keypad) or the output frequencies modified by the
UP/DOWN signal commands) back to the original values and then
restart the operation.
(3) The control circuit failed.
Check if
erf
occurs each time the power is turned ON.

The control PCB (on which the CPU is mounted) is defective.
Contact your Fuji Electric representative.
[ 18 ]
erh
Hardware error
Phenomena Faulty contact of the connector connecting the control and power printed circuit boards was
detected.
Possible Causes Check and Measures
(1) The control printed circuit board
is misconnected to the power
printed circuit board.
It is necessary to replace the power or control printed circuit board.

Contact your Fuji Electric representative.
[ 19 ]
ero
Positioning control error
Phenomena Excessive position deviation occurred on servo lock / position control.
Possible Causes Check and Measures
(1) Insufficient gain in positioning
control system (servo lock)
Readjust the settings of J97 (Servo lock (Gain)) and d03 (Speed control
1 P (Gain)).
(2) Incorrect control completion
width (servo lock)
Check whether the setting of J99 (Servo lock (Completion range)) is
correct.

Correct the setting of J99.
(3) Position deviation is excessive.
(servo lock)
Check whether the excessive error detection level (d78) is set up
properly.
(4) Position deviation is excessive.
(position control)
The position feedback pulses are not received.

Check whether the PG is connected correctly. Or, tighten the related
terminal screws.

Check whether any contact part bites the wire sheath.

Replace the wire / pulse generator.