Yaskawa G5HHP Drive - Manual (Page 192)

Advanced Operation
7.3.5 Torque Limit Function
7 - 28
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Setting a Torque Limit with Constants: L7-01 to L7-04
D
Torque limits can be set separately for the 4 ways that torque can be applied: forward torque, reverse
torque, forward regenerative torque, and reverse forward regenerative torque.
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
L7-01 Forward torque limit x 0 to 300 % 200 x x B B
L7-02 Reverse torque limit x 0 to 300 % 200 x x B B
L7-03
Forward regenerative
torque limit
x 0 to 300 % 200 x x B B
L7-04
Reverse regenerative
torque limit
x 0 to 300 % 200 x x B B
D
Figure 7.14 shows the relationship between each constant and the output torque.
L7-04
L7-01
L7-02
L7-03
Output torque
Forward
direction
Reverse
direction
Motor speed
Reverse Forward
Regenerative
torque
Regenerative
torque
Fig 7.14 Torque Limit Function
D
When the torque limit function is used, the torque control has priority and motor speed control and com-
pensation will be disregarded, so the acceleration/deceleration times might be lengthened and motor
speed might be reduced.
J
Limiting Torque with Analog Inputs: H3-05, H3-09
The following two analog inputs that can be used to limit torque. Use either or both of these inputs as needed
with constants H3-05 and H3-09.
D
Multi-function analog input terminal 42
D
Frequency reference (current) terminal 39
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
H3-05
Multi-function analog
input (terminal 42)
x 0 to 1F -- 0 B B B B
H3-09
Multi-function analog
input (terminal 39)
x 1 to 1F -- 1F A A A A
D
Settings
Setting Name
10 Forward Torque Limit
11 Reverse Torque Limit
12 Regenerative Torque Limit
13 Torque reference (The input limits torque in both the forward and reverse directions during speed
control.)
15 Forward/Reverse Torque Limit (Limits torque in both the forward and reverse directions.)
D
The above table shows only those settings related to the torque limit function.
D
Set the analog input terminal’s signal level, gain, and bias to match the actual input signal.
7