Fuji Electric FRENIC-ECO - Erf Data Saving Error During Undervoltage; Erp RS-485 Communications Error

6-18
Possible Causes What to Check and Suggested Measures
(6) A high intensity noise was
given to the inverter.
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.
Î Improve noise reduction measures on the host side.
Î Replace the RS-485 relay converter with a recommended insulated
converter.
[ 23 ]
erf Data saving error during undervoltage
Problem The inverter was unable to save data such as the frequency commands and PID process command
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
data was being saved
when the power was
turned OFF, because the
DC link bus was rapidly
discharged.
Check how long it takes for the DC link bus voltage to drop to the preset
voltage when power is turned OFF.
Î Remove whatever is causing the rapid discharge of the DC link bus
electricity. After pressing the
key and releasing the alarm, set, using a
remote keypad, the data of the relevant function codes (such as the
frequency commands and PID process command) back to the original
values and then restart the operation.
(2) A high intensity noise
affected the operation of
the inverter while data was
being saved 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. After pressing the
key and releasing the alarm,
set, using a remote keypad, the data of the relevant function codes (such
as the frequency commands and PID process command) back to the
original values and then restart the operation.
(3) The control circuit failed. Check if erf occurs each time power is switched on.
Î This problem was caused by a problem of the printed circuit board (PCB)
(on which the CPU is mounted). Contact your Fuji Electric representative.
[ 24 ]
erp RS-485 communications error
Problem A communications error occurred during RS-485 communications.
Possible Causes What to Check and Suggested Measures
(1) Conditions for
communications differ
between the inverter and
host equipment.
Compare the settings of the y codes (y01 to y10) with those of the host
equipment.
Î Correct any settings that differ.
(2) Even though no response
error detection time (y18)
has been set,
communications did not
occur cyclically.
Check the host equipment.
Î Change the settings of host equipment software, or make the no
response error detection time invalid (y18=0).
(3) Host equipment (e.g.,
PLCs and personal
computers) did not
operate due to incorrect
settings and/or defective
software/hardware.
Check the host equipment.
Î Remove the cause of the equipment error.
(4) Relay converters (e.g.,
RS-485 relay converter)
did not operate due to
incorrect connections and
settings, and defective
hardware.
Check the RS-485 relay converter (e.g., check for poor contact).
Î Change the various RS-485 converter settings, reconnect the wires, o
r
replace hardware (such as recommended devices) as appropriate.