Fuji Electric FRENIC-Ace series - 8 ] Keypad Communications Error; Er3 CPU Error; Er5 Option Error

6.3 If an Alarm Code Appears on the LED Monitor
6-8
[ 8 ]
er2
Keypad communications error
Phenomena A communications error occurred between the keypad and the inverter.
Possible Causes Check and Measures
(1) Broken communications 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.
 Use wires of the recommended size (0.75 mm
2
) for wiring.
 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 communications cables and main
circuit wires).
 Implement noise control measures. For details, refer to Appendix A.
(4) A keypad failure occurred. Replace the keypad with another one and check whether a
communications error ( er2 ) occurs.
 Replace the keypad.
[ 9 ]
er3
CPU error
Phenomena A CPU error (e.g. erratic CPU operation) occurred.
Possible Causes Check and Measures
(1) The inverter was affected by
strong electrical noise.
Check if appropriate noise control measures have been implemented
(e.g. correct grounding and routing of signal wires, communications
cables, and main circuit wires).
 Implement noise control measures.
(2) The [PLC] and [CM] terminals
have been shorted.
Check whether the [PLC] and [CM] terminals have been shorted.
(FRN0020E2■-2/ FRN0011E2■-7/ FRN0072E2■-4 or below)
[ 10 ]
er4
Option communications error
Phenomena A communications error occurred between the option card and the inverter.
Possible Causes 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 whether appropriate noise control measures have been
implemented (e.g. correct grounding and routing of signal wires,
communications cables, and main circuit wires).
 Implement noise control measures.
[ 11 ]
er5
Option error
An error detected by the option card.
Refer to the instruction manual of the option card for details.