gefran VDI100 Series Instruction Manual page 275

Torque limit can be set in two ways:
- Use torque limit parameters (21-05 to 21-08) to set a fixed torque limit.
- Set the torque limit by using the multi-function analog input (AI2).
There are four torque limits that can be set separately, one for each quadrant:
(I) Positive torque limit in forward direction (21-05 positive torque limit)
(II) Positive torque limit of reverse direction (21-06 negative torque limit)
(III) Negative torque limit in reverse direction (21-07 forward regenerating torque limit)
(IV) Negative torque limit in forward direction (21-08 reversal regenerating torque limit)
Refer to Figure 4.4.127.
Torque limit setting by using multi-function analog input AI2 (04-05).
04-05 (AI2)
Set the analog input terminal (AI2) signal level (04-00), gain (04-07) and bias (04-08)
The default setting for the analog input AI2 is 0 -10V representing 0 – 100% of the motor rated torque).
Figure 4.4.128 shows the relationship between the output torque and the torque limit.
When the analog input is set to positive torque limit (value = 11) the torque limit is active in the third and fourth
quadrant.in the reverse direction (regenerative torque in the second quadrant).
When the analog input is set to negative torque limit (value = 12) the torque limit is active in the third and fourth
VDI100 • Instruction manual
I: Forward rotation positive torque
II: Reverse rotation positive torque
III: Reverse rotation negative torque
IV: Forward Rotation negative torque
11 Positive torque limit
12 Negative torque limit
13 Regenerative torque limit (for both forward and reversal directions).
14 Positive/negative torque limit (positive and negative detection torque limit )
Figure 4.4.128 Analog input torque limit (AI2)
II: Reverse
regenerating
21-08
21-06
III: Reverse driving
Figure 4.4.127 Torque limit setting
Output Torque (T)
21-08
II
III
21-06
Reverse
direction
Table 4.4.18 Torque limit analog input
Function
Output Torque (T)
I: Forward driving
(Positive torque limit, 04-05=11)
(Positive / negative torque limit, 04-05=14)
21-05
Motor Speed (N)
21-07
(Regenerative torque limit, 04-05=13)
(Negative torque limit, 04-05=12)
(Positive / negative torque limit, 04-05=14)
IV: Forward generating
21-05
Positive torque
I
Motor Speed
IV
Negative torque
21-07
Forward
direction
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