6-17
[ 15 ]
er6
Operation protection
Problem An error occurred due to incorrect operation of the motor.
Possible Causes What to Check and Suggested Measures
(1) The key was pressed
when H96 = 1 or 3.
Even though a run command was present at the input terminal
or the communication port, the inverter was forced to
decelerate to stop and
er6
was displayed.
If this was not intended, check the setting of H96.
(2) The start check function
was activated when H96 =
2 or 3.
When one of the following conditions occurred while a run
command was present at the input, the inverter did not run and
er6
was displayed:
- The power was switched on
- An alarm was released
- The inverter was switched to link command LE operation.
Review the running sequence to avoid input of the run
command when
er6
has occurred.
If this was not intended, check the setting of H96.
(To reset the alarm, turn the run command off.)
[ 16 ]
er8
RS-485 communications error
Problem A communications error occurred during RS-485 communications.
Possible Causes What to Check and Suggested Measures
(1) Host controllers (e.g.,
PLCs and personal
computers) did not
operate due to incorrect
settings and/or defective
software/hardware.
Check the controllers.
Remove the cause of the controller error.
(2) RS-485 converter did not
operate due to incorrect
connections and settings,
or hardware defective.
Check the RS-485 converter (e.g., check for poor contact).
Change the various RS-485 converter settings, reconnec
the wires, or replace the converter with a recommended
device as appropriate.
(3) Broken communications
cable or poor contact.
Check continuity of the cable, contacts and connections.
Replace the cable.
(4) Even though no response
error detection time (y08)
has been set,
communications did not
occur cyclically.
Check the host controllers.
Change the settings of host controller software, or make the
no response error detection time invalid (y08=0).
(5) 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).
Improve noise control.
Improve noise reduction measures on the host side.
Replace the relay converter with a recommended insulated
converter.
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