Yaskawa G7 Drive - Manual (Page 261)

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„ Setting Precautions
• When the torque limit function is operating, control and compensation of the motor speed is disabled
because torque control is given priority.
• When using the torque limit to raise and lower loads, do not carelessly lower the torque limit value, as this
may result in the motor falling or slipping.
• Torque limits using an analog input are the upper limit value (during 10Vor 20mA input) of 100% of the
motor rated torque. To make the torque limit value during 10Vor 20mA input 150% of the rated torque, set
the input terminal gain to 150.0 (%). Adjust the gain for multi-function analog input terminal A2 using H3-
10 and for multi-function analog input terminal A3 using H3-06.
• The torque limit accuracy is ±5% at the output frequency of 10Hz or above. When output frequency is less
than 10Hz, accuracy is lowered.
‹ Preventing Motor Stalling During Operation
Stall prevention during operation prevents the motor from stalling by automatically lowering the Drive's out-
put frequency when a transient overload occurs while the motor is operating at a constant speed.
Stall prevention during operation is enabled only during V/f control. If the Drive output current continues to
exceed the setting in parameter L3-06 for 100ms or longer, the motor speed is reduced. Set whether to enable
or disable deceleration time using parameter L3-05. Set the deceleration time using C1-02 (Acceleration time
1) or C1-04 (Acceleration Time 2).
If the Drive output current reaches the set value in L3-06 - 2% (Drive Rated Output Current), the motor will
accelerate again at the frequency set or the acceleration time set.
„ Related Parameters
Parameter
Number
Name
Description
Setting
Range Factory
Setting
Change
during
Operation
Control Methods
Display V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vector
Open
Loop
Vector
2
L3-05
Stall
Prevention
Selection
During
Running Selects the stall prevention method
to use to prevent Drive faults
during run.
0: Disabled - Drive runs a set
frequency. A heavy load may
cause the Drive to trip on an OC
or OL fault.
1: Decel Time 1 - In order to avoid
stalling during heavy loading,
the Drive will decelerate at
Decel time 1 (C1-02) if the
output current exceeds the level
set by L3-06. Once the current
level drops below the L3-06
level, the Drive will accelerate
back to its frequency reference
at the active acceleration rate.
2: Decel Time 2 - Same as setting 1
except the Drive decelerates at
Decel Time 2 (C1-04).
When output frequency is 6Hz or
less, stall prevention during run is
disabled regardless of the setting in
L3-05.
0 to 2 1 No A A No No No
StallP Run
Sel
L3-06
Stall
Prevention
Level During
Running
This parameter is enabled when L3-
05 is set to "1" or "2". Drive rated
current is set as 100%.
Decrease the set value if stalling or
excessive current occurs with the
factory settings.
30 to
200
160% No A A No No No
StallP Run
Level