Fuji Electric FRENIC-HVAC User Manual page 646

Possible Causes
(6) Cooling fan's airflow volume
decreased due to the service life
expired or failure.
(7) The wires to the motor are too
long, causing a large leakage
current from them.
[ 15 ] Er1 Memory error
Problem Error occurred in writing the data to the memory in the inverter.
Possible Causes
(1) When writing data (especially
initializing or copying data), the
inverter was shut down so that the
voltage to the control PCB has
dropped.
(2) Inverter affected by strong
electrical noise when writing data
(especially initializing or copying
data).
(3) The control PCB failed.
[ 16 ] Er2 Keypad communications error
Problem A communications error occurred between the standard keypad or the multi-function keypad and
the inverter.
Possible Causes
(1) Broken communications cable or
poor contact.
(2) Connecting many control wires
hinders the front cover from
being mounted, lifting the
keypad.
(3) Inverter affected by strong
electrical noise.
(4) A keypad failure occurred.
What to Check and Suggested Measures
Check the cumulative run time of the cooling fan. (See Chapter 5,
Section "5.6.4.4 Viewing Maintenance Information".)
 Replace the cooling fan.
Visually check that the cooling fan rotates normally.
 Replace the cooling fan.
Measure the leakage current.
 Insert an output circuit filter (OFL).
What to Check and Suggested Measures
Initialize the function code data with H03 (= 1). After initialization,
check if pressing the key releases the alarm.
 Revert the initialized function code data to their previous
settings, 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). Also, perform the same check as described in (1) above.
 Implement noise control measures. Revert the initialized function
code data to their previous settings, then restart the operation.
Initialize the function code data by setting H03 to "1," then reset the
alarm by pressing the
 The control PCB (on which the CPU is mounted) is defective.
Contact your Fuji Electric representative.
What to Check and Suggested Measures
Check continuity of the cable, contacts and connections.
 Re-insert the connector firmly.
 Replace the cable.
Check the mounting condition of the front cover.
 Use wires of the recommended size (0.75 mm
 Change the wiring layout inside the unit so that the front cover
can be mounted firmly.
Check if appropriate noise control measures have been implemented
(e.g., correct grounding and routing of communication cables and
main circuit wires).
 Implement noise control measures. For details, refer to Appendix
A.
Replace the keypad with another one and check whether a keypad
communications error (Er2) occurs.
 Replace the keypad.
9-12
key and check that the alarm goes on.
2
) for wiring.