Yaskawa VS-626 MC5 - Manual (Page 142)

Advanced Operation
7.1.1 Torque Limit Function
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J Limiting Torque with Analog Inputs: H3-05, H3-09
The following two analog inputs that can be used to limit torque.
Multi-function analog input, terminal 16
Frequency reference (current), terminal 14
Use either or both of these inputs as needed with constants H3-05 and H3-09.
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting Open Loop
Vector
Flux Vector
H3-05
Multi-function analog
input (terminal 16)
0 to 1F -- 0 B B
H3-09
Multi-function analog
input (terminal 14)
1 to 1F -- 1F A A
D Settings
Setting Function
10 Forward Torque Limit
11 Reverse Torque Limit
12 Regenerative Torque Limit
15 Forward/Reverse Torque Limit
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.
D The factory settings for the input terminal’s signal level are as follows:
x Terminal 16: 0 to 10 V (A 10 V input limits the torque to 100% of the motor’s rated torque.)
x Terminal 14: 4 to 20 mA (A 20 mA input limits the torque to 100% of the motor’s rated torque.)
Figure 7.2 shows the relationship between the output torque and each torque limit.
Output torque
Forward direction
Reverse direction
Regenerative torque limit
Reverse torque limit
Motor speed
Reverse Forward
Forward torque limit
Regenerative torque limit
Fig
7.2 Limiting Torque with Analog Inputs
D When the forward torque limit has been set, the analog input signal acts as the limit value for torque
generated in the forward direction. The torque limit input is effective when torque is generated in the
forward direction even if the motor is operating in reverse (regenerative torque).
D The torque limit is 100% of the motor’s rated torque when the analog input is at its maximum value
(10 V or 20 mA). To increase the torque limit above 100%, set the input terminal’s gain above 100%.
For example, a gain of 150.0% would result in a torque limit of 150% of the motor’s rated torque with
a 10 V or 20 mA analog input.
x Gain for multi-function analog input, terminal 16: H3-06
x Gain for frequency reference (current), terminal 14: H3-10
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