7
-12
VCF
VCF
Main Circuit Capacitor Neutral
Point Potential Error
An excessive imbalance occurred in
the main circuit capacitor’s neutral
point potential.
A loss in capacity due to aging of the
main circuit capacitor.
Replace the main circuit capacitor.
(Consult your YASKAWA repre-
sentative.)
The Inverter parts are faulty.
Replace the Inverter.
An open phase was detected for an
output.
Refer to
LF
(output open phase) in
this table.
Carrier frequency set value (C6-03,
C6-04) is unsuitable.
Check the set values for C6-03
and C6-04. The maximum output
frequency that can be set for 400
V Class Inverters is restricted by
the carrier frequency setting.
Refer to page 6-45.
In V/f or open-loop vector control, the
motor consecutively loses synchro-
nism (the output current exceeds
200% of the Inverter rated current).
• Reduce the load.
• Increase the acceleration time.
• Check the settings for V/f con-
trol.
• Use larger capacity Inverter.
OPERATOR
ERR RAM
CHECK ERR
Operator Error (Internal RAM
Fault)
At power ON, an error was detected
from the results of the internal RAM
Write/Read check.
---
Replace the Operator.
OPERATOR
ERR ROM
CHECK ERR
Operator Error (CPU Internal ROM
Fault)
At power ON and during operation, an
error was detected when the internal
ROM was checked.
OPERATOR
ERR DATA
SEND ERR
Operator Error (Transmission Cir-
cuit Fault)
During operation, send processing did
not complete within 500 ms continu-
ously at least 10 times.
OPERATOR
ERR RAM
CHECK ERR
Operator Error (Internal RAM
Fault)
During operation, an error was
detected when the display pattern for
the character code 80 to 8F recorded
in the internal RAM was checked.
OPERATOR
ERR WATCH
DOG ERR
Operator Error (Watchdog Error)
During operation, an error was
detected in the program execution.
Table 7.1 Fault Displays and Processing (Continued)
Display
Meaning
Probable Causes
Corrective Actions