YASKAWA G7 Series Technical Manual page 387

Display Meaning
Undertorque Detected 1
UL3
There has been a current less than the
Undertorq
setting in L6-02 for longer than the
Det 1
setting in L6-03.
Undertorque Detected 2
UL4
There has been a current less than the
Undertorq
setting in L6-05 for longer than the
Det 2
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 Drive
PG Open
was outputting a frequency.
Excessive Speed Deviation
DEV
The speed deviation has been greater
Speed
than the setting in F1-10 for longer
Deviation
than the setting in F1-11.
Control Fault
The torque limit was reached continu-
ously for 3 seconds or longer during a
deceleration stop during open-loop
vector control 1.
CF
Out of
Control
An error occurred in the speed estima-
tion calculation for open-loop vector
control 2.
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Table 7.1 Fault Displays and Processing (Continued)
Probable Causes
Overshooting/Undershooting are
occurring.
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.
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.
Motor parameter settings are not cor-
rect.
Motor parameter settings are not cor-
rect.
Run command was received when the
motor was coasting.
Protective and Diagnostic Functions
Corrective Actions
• Make sure that the settings in
L6-02 and L6-03 are appropri-
ate.
-
• Check the mechanical system
and correct the cause of the
overtorque.
• Make sure that the current set-
ting in L6-05 and time setting in
L6-06 are appropriate.
-
• Check the mechanical system
and correct the cause of the
overtorque.
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 parameters.
• Perform autotuning.
• Perform autotuning.
• Input the run command after the
motor stops.
• Set b3-01 (Speed search selec-
tion) to 1 or 3 (speed search
enabled at startup).
• Refer to Precautions When
Using Open-loop Vector Con-
trol 2 on page 10-4.
5
7-