YASKAWA Varispeed G7 Series Instruction Manual page 427

Display
Undertorque Detected 1
UL3
There has been a current less than
Undertorq
the setting in L6-02 for longer than
Det 1
the setting in L6-03.
Undertorque Detected 2
UL4
There has been a current less than
Undertorq
the setting in L6-05 for longer than
Det 2
the setting in L6-06.
Overspeed
OS
The speed has been greater than the
Overspeed
setting in F1-08 for longer than the
Det
setting in F1-09.
PG Disconnection Detected
PGO
PG pulses were input when the
PG Open
Inverter was outputting a frequency.
Excessive Speed Deviation
DEV
The speed deviation has been
Speed
greater than the setting in F1-10 for
Deviation
longer than the setting in F1-11.
Control Fault
The torque limit was reached con-
tinuously for 3 seconds or longer
CF
during a deceleration stop during
Out of
open-loop vector 1 control.
Control
An error occurred in the speed esti-
mation calculation for open-loop
vector 2 control.
PID Feedback Reference Lost
A PID feedback reference loss was
FBL detected (b5-12 = 2) and the PID
Feedback feedback input was less than b5-13
Loss (PID feedback loss detection level)
for longer than the time set in b5-14
(PID feedback loss detection time).
-8
7
Table 7.1 Fault Displays and Processing (Continued)
Meaning
Overshooting/Undershooting are occur-
ring.
The reference speed is too high.
The settings in F1-08 and F1-09 aren't
appropriate.
There is a break in the PG wiring.
The PG is wired incorrectly.
Power isn't being supplied to the PG.
Brake is applied to the motor.
The load is too heavy.
The acceleration time and deceleration
time are too short.
The load is locked.
The settings in F1-10 and F1-11 aren't
appropriate.
Brake is applied to the motor.
Motor constant settings are not correct.
Refer to Corrective Actions for Control Faults (CF) on page 7-15.
The settings in b5-13 and b5-14 aren't
appropriate.
The wiring of the PID feedback circuit
is incorrect.
Probable Causes
• Make sure that the settings in
–
• Check the mechanical system
• Make sure that the current set-
–
• Check the mechanical system
Adjust the gain again.
Check the reference circuit and
reference gain.
Check the settings in F1-08 and
F1-09.
Fix the broken/disconnected wir-
ing.
Fix the wiring.
Supply power to the PG properly.
Check for open circuit when using
brake (motor).
Reduce the load.
Lengthen the acceleration time and
deceleration time.
Check the mechanical system.
Check the settings in F1-10 and
F1-11.
Check for open circuit when using
brake (motor).
• Check the motor constants.
• Perform autotuning.
Check the settings in b5-13 and
b5-14.
Fix the wiring.
Corrective Actions
L6-02 and L6-03 are appropri-
ate.
and correct the cause of the
overtorque.
ting in L6-05 and time setting in
L6-06 are appropriate.
and correct the cause of the
overtorque.