6-17
Chap. 6 TROUBLESHOOTING
[ 20 ]
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 signal wires, communications cables, and main circuit
wires).
Î Implement noise control measures.
[ 21 ]
er4
Option 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 engaged with that of the
inverter.
Î Reload the option card into the inverter.
(2) 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).
Î Implement noise control measures.
[ 22 ]
er5
Option error
An error detected by the option card. Refer to the instruction manual of the option card for details.
[ 23 ]
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 that the key was pressed when a run command had been entered from the
input terminal or through the communications port.
Î If this was not intended, check the setting of H96.
(2) The start check function was
activated when H96 = 2 or 3.
Check that any of the following operations has been performed with a run command
being entered.
- Turning the power ON
- Releasing 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 releasing the alarm.)
(3) The forced stop digital input
STOP was turned OFF.
Check that turning the STOP OFF decelerated the inverter to stop.
Î If this was not intended, check the settings of E01 through E07 for terminals
[X1] through [X7].
[ 24 ]
er7
Tuning error
Problem Auto-tuning failed.
Possible Causes What to Check and Suggested Measures
(1) A phase was missing (There
was a phase loss) in the
connection between the
inverter and the motor.
Î Properly connect the motor to the inverter.
(2) V/f or the rated current of the
motor was not properly set.
Check whether the data of function codes (F04*, F05*, H50 through H53, H65,
H66, P02*, and P03*) matches the motor specifications.
(3) The wiring length between the
inverter and the motor was too
long.
Check whether the wiring length between the inverter and the motor exceeds 50 m.
(Small capacity inverters are greatly affected by the wiring length.)
Î Review, and if necessary, change the layout of the inverter and the motor to
shorten the connection wire. Alternatively, minimize the wiring length without
changing the layout.
Î Disable both auto-tuning and auto-torque boost (set data of F37* to "1").
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