6.3 If an Alarm Code Appears on the LED Monitor
6-18
[ 19 ] erf Data saving error during undervoltage
Phenomenon: 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.
(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 with 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).
➔ Take noise countermeasures. 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 with 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.
[ 20 ] erH Hardware error
Phenomenon: The combination between PCBs is abnormal.
(1) Control PCB and power supply
PCB combination abnormality
It is necessary to replace the control PCB or power supply PCB.
➔ Contact your Fuji Electric representative.
(2) Option PCB connection defect
[Subcodes: 11, 12, 13]
Is the option PCB correctly connected to the connection port (A, B, or C)
on the control board?
➔ A port connection defect [subcode 11]
B port connection defect [subcode 12]
C port connection defect [subcode 13]
[ 21 ] ero Positioning control error
Phenomenon: Excessive position deviation occurred on servo lock / position control.
(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 wiring / pulse generator.
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