YASKAWA varispeed G7 CIMR-G7B series Instruction Manual page 402

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