Fuji Electric FRENIC MEGA G2 Series - 10 ] Er3 CPU Error; 11 ] Er4 Option Communication Error; 12 ] Er5 Option Error; 9 ] Er2 Keypad Communication Error

6.3 If an Alarm Code Appears on the LED Monitor
6-11
TROUBLESHOOOTING
Chap 6
[ 9 ] er2 Keypad communication error
Phenomenon: A communication error occurred between the keypad and the inverter.
Possible cause
Check and measures
(1) Broken communication cable or
poor contact.
Check continuity of the cable, contacts and connections.
➔ Re-insert the connector firmly.
➔ Replace the cable.
(2) Connecting many control wires
hinders the front cover from
being mounted, lifting the
keypad.
Check the mounting condition of the front cover.
➔ Reduce the wire size. (Recommended wire size (0.3 to 0.75 mm
2
)
➔ Change the wiring layout inside the unit so that the front cover can
be mounted firmly.
(3) The inverter was affected by
strong electrical noise.
Check if appropriate noise control measures have been implemented
(e.g., correct grounding and routing of communication cables and main
circuit wires).
➔ Take noise countermeasures. For details, refer to Appendix A .
(4) A keypad fault occurred.
Replace the keypad with another one and check whether the er2 error
occurs.
➔ Replace the keypad.
[ 10 ] er3 CPU error
Phenomenon: A CPU error (e.g. erratic CPU operation) occurred.
Possible cause
Check and measures
(1) The inverter was affected by
strong electrical noise.
Check noise countermeasures (grounding condition, signal line and
communication cable/main circuit wiring installation method, etc.)
➔ Implement noise control measures.
[ 11 ] er4 Option communication error
Phenomenon: A communication error occurred between the option card and the inverter.
Possible cause
Check and measures
(1) There was a problem with the
connection between the option
card and the inverter.
Check whether the connector on the option card is properly engaged
with that of the inverter.
➔ Reload the option card into the inverter.
(2) The inverter was affected by
strong electrical noise.
Check noise countermeasures (grounding condition, signal line and
communication cable/main circuit wiring installation method, etc.)
➔ Implement noise control measures.
[ 12 ] er5 Option error
An error detected by the option card.
Refer to the instruction manual of the option card for details.