YASKAWA Varispeed G7 Series User Manual

Protective and Diagnostic Functions
7- 7
OL2
Inv Over-
loaded
Inverter Overload
The Inverter overload protection
function has operated based on the
internal electronic thermal value.
The load is too heavy. The acceleration
time, deceleration time and cycle time
are too short.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
The constant setting for speed search is
incorrect.
(Motor overload occurred due to motor
hunting and vibration.)
• Use the speed search function.
• Adjust the settings of the Speed
search operating current (b3-02)
and Speed search deceleration
time (b3-03).
• Use the estimated speed search
function. (Autotuning for motor
line-to-line resistance is
required.)
The directions of the motor and PG are
different. (Only in flux vector control)
• Correct the PG wiring.
• Correct the motor wiring.
• Change the setting of PG rota-
tion (F1-05).
The V/f characteristics voltage is too
high.
Check the V/f characteristics.
The Inverter capacity is too low.
Replace the Inverter with one that
has a larger capacity.
• A short-circuit between +V, −V, and
AC terminals occurred.
• Overload in the control circuit termi-
nal.
• Make sure that incorrect wiring
has not been done.
• Check the resistance and wiring
for the frequency setting potenti-
ometer, etc. (Check that the cur-
rent for terminals +V and –V is
20 mA or less.)
Inverter overload occurred when run-
ning at a low speed of 6 Hz or less.
• Reduce the load.
• Increase the frame size of the
Inverter.
• Lower the carrier frequency.
OL3
Overtorque
Det 1
Overtorque Detected 1
There has been a current greater
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.
OL4
Overtorque
Det 2
Overtorque Detected 2
There has been a current greater
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.
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.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions
TOE-S616-60.1.book 7 ページ ２０１７年８月４日 金曜日 午後３時４１分

YASKAWA Varispeed G7 Series Specifications

General

Brand	YASKAWA
Model	Varispeed G7 Series
Category	Inverter
Language	English