Torque Limit Function - YASKAWA CIMR-MC5A20P4 Instruction Manual

7.2.1 Torque Limit Function

With flux vector control, the torque limit can be applied at an arbitrary value because the torque output
by the motor is calculated internally.
The torque limit function is useful when the load cannot sustain a torque above a certain level or regenera-
tive torque above a certain level.
The two ways to apply a torque limit are listed below.
Setting torque limits with the constants
D
Limiting torque with the analog inputs
D
The lower torque limit will be used if both of these methods are set. The accuracy of the torque limit is
5% at all frequencies.
Setting a Torque Limit with Constants: L7-01 to L7-04
J
Torque limits can be set separately for the 4 ways that torque can be applied: forward torque, reverse
D
torque, forward regenerative torque, and reverse forward regenerative torque.
User User
Constant
Number
L7-01
L7-02
L7-03
L7-04
Figure 7.5 shows the relationship between each constant and the output torque.
D
Reverse
Fig
When the torque limit function is used, the torque control has priority and motor speed control and
D
compensation will be disregarded, so the acceleration/deceleration times might be lengthened and mo-
tor speed might be reduced.
Limiting Torque with Analog Inputs: H3-05, H3-09
J
The following two analog inputs that can be used to limit torque. Use either or both of these inputs as need-
ed with constants H3-05 and H3-09.
Multi-function analog input terminal 16
D
Frequency reference (current) terminal 14
D
User User
Constant
Number
H3-05
H3-09
Change
during during
Name
Opera-
tion
Forward torque limit
Reverse torque limit
Forward regenerative
torque limit
Reverse regenerative
torque limit
Output torque
Forward
direction
L7-04
Regenerative
torque
Regenerative
torque
L7-02
Reverse
direction

7.5 Torque Limit Function

Change
during during
Name
Opera-
tion
Multi-function analog
input (terminal 16)
Multi-function analog
input (terminal 14)
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Setting Setting Factory Factory
Unit
Open Loop
Range Setting
0 to 300 % 200
0 to 300 % 200
0 to 300 % 200
0 to 300 % 200
L7-01
Motor speed
Forward
L7-03
Setting Setting Factory Factory
Unit
Open Loop
Range Setting
0 to 1F - - 0
1 to 1F - - 1F
7.2 F lux Vector Control
Valid Access Levels
Flux Vector
Vector
B B
B B
B B
B B
Valid Access Levels
Flux Vector
Vector
B B
A A
7