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Protective and Diagnostic Functions
7
-
5
PI Feedback Reference Lost
A PI feedback reference loss was
detected (b5-12 = 2) and the PI feed-
back input was less than b5-13 (PI
feedback loss detection level) for
longer than the time set in b5-14 (PI
feedback loss detection time).
-
-
External fault input from Communi-
cations Option Card
-
Check the Communications
Option Card and communications
signals.
External fault (Input terminal 3)
An "external fault" was input from a
multi-function input terminal (S3 to
S7).
• Reset external fault inputs to the
multi-function inputs.
• Remove the cause of the exter-
nal fault.
External fault (Input terminal 4)
External fault (Input terminal 5)
External fault (Input terminal 6)
External fault (Input terminal 7)
Digital Operator Connection Fault
The connection to the Digital Operator
was broken during operation for a
RUN command from the Digital
Operator.
-
Check the connection to the Digi-
tal Operator.
RS-422A/485 Communications
Error
A normal reception was not possible
for 2 s or longer after control data was
received once.
-
Check the communications
devices and communications sig-
nals.
Option Communications Error
A communications error was detected
during a run command or while setting
a frequency reference from a Commu-
nications Option Card.
-
Check the communications
devices and communications sig-
nals.
Digital Operator Communications
Error 1
Communications with the Digital
Operator were not established within 5
seconds after the power was turned
on.
The Digital Operator's connector isn't
connected properly.
Disconnect the Digital Operator
and then connect it again.
The Inverter's control circuits are
faulty.
Replace the Inverter.
CPU External RAM Fault
-
Try turning the power supply off
and on again.
The control circuits were destroyed.
Replace the Inverter.
Digital Operator Communications
Error 2
After communications were estab-
lished, there was a communications
error with the Digital Operator for
more than 2 seconds.
The Digital Operator isn't connected
properly.
Disconnect the Digital Operator
and then connect it again.
The Inverter's control circuits are
faulty.
Replace the Inverter.
Table 7.1 Fault Displays and Processing (Continued)
Display
Description
Probable Causes
Corrective Actions