YASKAWA Varispeed G7 Series Instruction Manual page 448

Table 7.7 Troubleshooting when Motor Does Not Operate (Continued)
Probable Causes
The frequency reference
selection is wrong.
The MENU Key was
pressed.
The ESC Key was pressed
twice.
The LOCAL/REMOTE Key
was pressed.
The STOP Key was
pressed.
Wrong selection of a 2-wire
or a 3-wire sequence.
"Reverse run prohibited" is
selected.
Autotuning has just been
completed.
The motor stops during acceleration or when a load is connected.
The load may be too heavy. The Inverter has a stall prevention function and an automatic torque boost func-
tion, but the motor responsiveness limit may be exceeded if acceleration is too rapid or if the load is too heavy.
Lengthen the acceleration time or reduce the load. Also consider increasing the motor capacity.
The motor does not accelerate.
If the torque limit settings (L7-01 to L7-04) or the torque reference input (torque control) are too small, the
motor may not be able to accelerate. Check the settings and input values. Also, for operation with open-loop
vector 2 control, refer to Corrective Actions for Control Faults (CF) on page 7-15.
Descriptions
b1-01 has to be set according to the fre-
quency reference input method to be used.
b1-01 =
0: Digital Operator
1: Control circuit terminal (factory setting)
2: MEMOBUS communications
3: Option board
4: Pulse train input
If the MENU Key is pressed once or the
ESC Key is pressed twice, the Inverter will
exit the drive mode and will not operate. If
the MENU Key is pressed during operation,
the Inverter will not start even if the Run
Command is sent at the next operation.
If the LOCAL/REMOTE Key is pressed
while the Inverter is stopped, the Inverter
will switch to Digital Operator operation
and cannot be operated with the external
input terminals.
If the STOP Key is pressed during opera-
tion, the Inverter will decelerate to a stop.
If 0 is set to one of H1-01 to H1-10, a 3-
wire sequence is set.
If b1-04 (Prohibition of reverse operation)
is set to 1 (Reverse disabled), the motor will
not start if the Reverse Run Command is
sent.
The Inverter remains in the autotuning
mode right after autotuning has been com-
pleted and cannot be operated even if the
Run Command is sent.
Troubleshooting
Corrective Actions
Set b1-01 according to the frequency ref-
erence input method to be used.
The frequency reference selection result
can be checked with U1-85.
• Press the DATA/ENTER Key.
• Try turning the power supply off and on
again.
• Set b8-01 (Run Command selection in
programming modes) to 1(Cannot oper-
ate) to remain in the drive mode and
continue operation even if the MENU
Key or ESC Key is pressed.
• Press the LOCAL/REMOTE Key.
• Try turning the power supply off and on
again.
• Set o2-01 (LOCAL/REMOTE Key
enable/disable) to 0 (Disabled) to dis-
able the LOCAL/REMOTE Key.
• Turn the Run Command off and then on
again.
• Set o2-02 (STOP key during control cir-
cuit terminal operation) to 0 (Disabled)
to disable the STOP Key.
Make sure that H1-01 to H1-10 are set to a
value other than 0 to use a 2-wire
sequence.
Check the setting of b1-04.
Press the MENU Key to display the drive
mode on the Digital Operator and press
the DATA/ENTER Key to enter the drive
mode.
29
7-