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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
Stall
Prevention
Selection
During
Running
L3-05
StallP Run
Sel
Stall
Prevention
Level During
L3-06
Running
StallP Run
Level
-44
6
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Name
Description
Display
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.
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.
Change
Setting
Factory
during
Range
Setting
V/f
Operation
0 to 2
1
No
A
30 to
160%
No
A
200
Control Methods
Open
Open
V/f
Loop
Flux
Loop
with
Vector
Vector
Vector
PG
1
2
A
No
No
No
A
No
No
No
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Table of Contents
Troubleshooting
