Protective and Diagnostic Functions
7-5
OL7
HSB-OL
High-slip Braking OL
The output frequency did not change
for longer than the time set in N3-04.
The inertia returned to the load is too
large.
• Make sure the load is an inertial
load.
• Set the system so that the decel-
eration time that does not pro-
duce overvoltages is 120 s or
less.
UL3
Undertorq
Det 1
Undertorque Detected 1
There has been a current less than the
setting in L6-02 for longer than the
setting in L6-03.
-
• 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.
UL4
Undertorq
Det 2
Undertorque Detected 2
There has been a current less than the
setting in L6-05 for longer than the
setting in L6-06.
-
• 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.
OS
Overspeed
Det
Overspeed
The speed has been greater than the
setting in F1-08 for longer than the
setting in F1-09.
Overshooting/Undershooting are
occurring.
Adjust the gain again.
The reference speed is too high.
Check the reference circuit and
reference gain.
The settings in F1-08 and F1-09 aren't
appropriate.
Check the settings in F1-08 and
F1-09.
PGO
PG Open
PG Disconnection Detected
PG pulses were input when the
Inverter was outputting a frequency.
There is a break in the PG wiring.
Fix the broken/disconnected wir-
ing.
The PG is wired incorrectly. Fix the wiring.
Power isn't being supplied to the PG. Supply power to the PG properly.
-
Check for open circuit when using
brake (motor).
DEV
Speed
Deviation
Excessive Speed Deviation
The speed deviation has been greater
than the setting in F1-10 for longer
than the setting in F1-11.
The load is too heavy. Reduce the load.
The acceleration time and deceleration
time are too short.
Lengthen the acceleration time
and deceleration time.
The load is locked. Check the mechanical system.
The settings in F1-10 and F1-11 aren't
appropriate.
Check the settings in F1-10 and
F1-11.
-
Check for open circuit when using
brake (motor).
CF
Out of
Control
Control Fault
The torque limit was reached continu-
ously for 3 seconds or longer during a
deceleration stop during open-loop
vector 1 control.
Motor constant settings are not cor-
rect.
• Check the motor constants.
• Perform autotuning.
An error occurred in the speed estima-
tion calculation for open-loop vector 2
control.
Refer to Corrective Actions for Control Faults (CF) on page 7-10.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions
To Next Page
Loading...
