Fuji Electric FRENIC-HVAC User Manual page 650

[ 23 ] ErF Data saving error during undervoltage
Problem 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 terminal
commands when the power was turned OFF.
Possible Causes
(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 link bus.
(2) Inverter operation affected by
strong electrical noise when the
power was turned OFF.
(3) The control circuit failed.
[ 24 ] ErH Hardware error
Problem The LSI on the power printed circuit board malfunctions.
Possible Causes
(1) The inverter capacity setting on
the control printed circuit board is
wrong.
(2) Data stored in the power printed
circuit board memory is corrupted.
(3) The control printed circuit board is
misconnected to the power printed
circuit board.
[ 25 ] CoF Power input disconnect detection
Problem Power input disconnect is detected.
Possible Causes
(1) The current signal input to [C1]
has fallen to 2 mA or less.
What to Check and Suggested Measures
Check how long it takes for the DC link bus voltage to drop to the
preset voltage when the power is turned OFF.
 Remove whatever is causing the rapid discharge of the DC link
bus voltage. After pressing the
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
terminal commands) back to the original values and then restart
the operation.
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
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 terminal commands) back to the
original values and then restart the operation.
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.
What to Check and Suggested Measures
It is necessary to set the inverter capacity correctly.
 Contact your Fuji Electric representative.
It is necessary to replace the power printed circuit board.
 Contact your Fuji Electric representative.
It is necessary to replace the power or control printed circuit board.
 Contact your Fuji Electric representative.
What to Check and Suggested Measures
Check the main inverter unit connection and wiring and transmission-side
equipment.
Review function code (H91) data.
9-16
key and releasing the alarm,
key