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[ 13 ]
er2
Keypad communications error
Problem
A communications error occurred between the remote keypad (option) and the
inverter.
Possible Causes
What to Check and Suggested Measures
(1) Broken communications
cable or poor contact.
Check continuity of the cable, contacts and connections.
Î
Re-insert the connector firmly.
Î
Replace the cable.
(2) Inverter affected by
strong electrical noise.
Check if appropriate noise control measures have been
implemented (e.g., correct grounding and routing of control and
main circuit wires).
Î
Implement noise control measures. For details, refer to the
FRENIC-Mini User's Manual, "Appendix A."
(3) The remote keypad
(option) defective.
Replace the keypad with another one and check whether a keypad
communications error (
er2
) no longer occurs.
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) Inverter affected by
strong electrical noise.
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
Implement noise control measures.
[ 15 ]
er6
Operation protection
Problem
An incorrect operation was attempted.
Possible Causes
What to Check and Suggested Measures
(1) The
key was
pressed when H96 = 1
or 3.
Check if the
key was pressed when a run command had been
entered from the input terminal or through the communications link.
Î
If this was not intended, check the setting of H96.
(2) The start check function
was activated when H96
= 2 or 3.
Check if any of the following operations has been performed with a
run command being entered.
- Turning the power ON
- Resetting the alarm
- Switching the enable communications link
LE
operation
Î
Review the running sequence to avoid input of a run command
when this error occurs.
If this was not intended, check the setting of H96.
(Turn the run command OFF before resetting the alarm.)