6-19
[ 13 ]
er2
Keypad communications error
Problem
A communications error occurred between the standard keypad or the multi-function
keypad and the inverter.
Possible Causes
What to Check and Suggested Measures
(1) Break in the
communications cable
or poor contact.
Check continuity of the cable, contacts and connections.
Î
Re-insert the connector firmly.
Î
Replace the cable.
(2) 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. For details, refer to "Appendix A" of the
FRENIC-Multi User's Manual.
(3) The keypad
malfunctioned.
Check that alarm
er2
does not occur if you connect another
keypad to the inverter.
Î
Replace the keypad.
[ 14 ]
er3
CPU error
Problem
A CPU error (e.g. erratic CPU operation) occurred.
Possible Causes
What to Check and Suggested Measures
(1) 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 and communications cable).
Î
Improve noise control.
[ 15 ]
er4
Option card communications error
Problem
A communications error occurred between the option card and the inverter.
Possible Causes
What to Check and Suggested 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 mating
with the connector of the inverter.
Î
Reload the bus option card into the inverter.
(2) There was a high
intensity noise from
outside.
Check whether appropriate noise control measures have been
implemented (e.g. correct grounding and routing of control and
main circuit wires and communications cable).
Î
Reinforce noise control measures.
[ 16 ]
er5
Option card error
An error detected by the option card. Refer to the instruction manual of the option card for details.
