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Chapter 4
4.2.100 Torque limitation function
The torque limitation function allows you to limit the motor
output torque when "03" (sensorless vector control), "04"
(0Hz-range sensorless vector control), or "05" (vector control with
sensor) is specified for the V/F characteristic curve selection
(A044/A244).
You can select one of the following four torque limitation modes with the torque limit selection (b040):
1) Quadrant-specific setting mode
In this mode, individual torque limit values to be applied to four quadrants (i.e. forward powering, reverse
regeneration, reverse powering, and forward regeneration) are set as the torque limits 1 to 4 (b041 to b044),
respectively.
2) Terminal-switching mode
In this mode, the torque limit values set in the torque limits 1 to 4 (b041 to b044) are switched from one another
according to the combination of the states of torque limit switch terminals 1 and 2 (TRQ1 and TRQ2) assigned to
intelligent input terminals. A single selected torque limit is valid in all operating states of the inverter.
3) Analog input mode
In this mode, a torque limit value is set by a voltage applied to the control circuit terminal O2. The voltage range 0
to 10 V corresponds to the torque limit value range 0 to 200%. A single selected torque limit is valid in all
operating states of the inverter.
4) Option (option 1/2) mode
This mode is valid when the option board (SJ-DG) is used. For details on this mode, refer to the instruction manual
for the option board.
If function "40" (TL: whether to enable torque limitation) has been assigned to an intelligent input terminal, the
torque limitation mode selected by the setting of "b040" is enabled only when the TL terminal is turned on. When
the TL terminal is off, torque limit settings are invalid, and the maximum torque setting is applied as a torque limit.
If the TL function has not been assigned to any intelligent input terminal, the torque limitation mode selected by
the setting of "b040" is always enabled.
Each torque limit value used for this function is expressed as a ratio of the maximum torque generated when the
inverter outputs its maximum current on the assumption that the maximum torque is 200%. Note that each
torque limit value does not represent an absolute value of torque. The actual output torque varies depending on
the motor.
If the torque limited (TRQ) signal function is assigned to an intelligent output terminal, the TRQ signal will turn on
when the torque limitation function operates.
Item
V/F characteristic curve selection
Torque limit selection
Torque limit (1)
Torque limit (2)
Torque limit (3)
Torque limit (4)
Terminal function
Terminal function
(NOTE) <>:applied for 75 to 150kW
Function code
Data or range of data
A044/A244
b040
b041
CT mode:
0 to 200 (%)
b042
<0 to 180(%)>
VT mode:
b043
0 to 150 (%)
<0 to 150(%)>
b044
C001 to C008
C021 to C025
4-92
Explanation of Functions
Related code
A044/A244: V/F characteristic curve selection,
1st/2nd motors
b040: Torque limit selection
b041 to b044: Torque limits (1) to (4)
C001 to C008: Terminal [1] to [8] functions
C021 to C025: Terminal [11] to [15] functions
03
Sensorless vector control
04
0Hz-range sensorless vector control
05
Vector control with sensor (not
available for A244)
00
Quadrant-specific setting mode
01
Terminal-switching mode
02
Analog input mode
03
Option 1 mode
04
Option 2 mode
Forward powering (in quadrant-specific
setting mode)
Reverse regeneration (in quadrant-
specific setting mode)
Reverse powering (in quadrant-specific
setting mode)
Forward regeneration (in
quadrant-specific setting mode)
40
Whether to enable torque limitation
41
Torque limit switch 1
42
Torque limit switch 2
10
Torque limited signal
Description
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