5motor control & motor settings – Lenze i700 User Manual
Page 125
Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
125
5
Motor control & motor settings
5.12
Fine adjustment des motor model
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5.12.1.1
Example for determining the saturation characteristic
Given values:
• Rated motor current: 5 A
• Maximum motor current: 20 A
• Maximum process current: 15 A
Procedure:
1. Deactivate correction: Set all subindices of object
(or
for axis B) to 100 %.
2. Use object
for axis B) to set the maximum current up to which the motor is
to be actuated in the process (in this example "15 A").
3. Adjust the current controller with different current setpoints by means of the manual test mode
"current pulse" and take down the corresponding settings for Vp and Tn.
• The procedure is described in the
Manual test mode "Current pulse"
chapter.
• The current setpoints to be set for the corresponding adjustment in object
(or
for axis B) result from the scaling of the maximum process current to the X axis of
the saturation characteristic.
• The grid points which are required to define the saturation characteristic with a sufficient
quality varies from motor to motor and thus has to be determined individually.
• For this example, currents that are part of the grid points 5, 9, 13, and 15 have been selected,
and a measurement at rated motor current was carried out additionally:
[5-3]
Saturation characteristic: Distribution of the grid points
Rated motor current
Maximum process current (≡ 100 %)
15 A
7.5 A
3.75 A
11.25 A
12.38 A
5 A
0
6.25
12.5
18.75
25
31.25
37.5
43.75
50
56.25
62.5
68.75
75
81.25
87.5
93.75
100
0 A
I
max
[%]
Vp
Tn
[V/A]
[ms]
x2
x3
x4
x5
x6
x7
x8
x9
x10
x11
x12
x13
x14
x15
x16
x17
x1
Specifications for adjustment
Measured values
Grid point
Scaling
Current setpoint
Vp [V/A]
Tn [ms]
5
0.25 * 15 A =
3.75 A
5.2
6.5
9
0.5 * 15 A =
7.5 A
2.6
4
13
0.75 * 15 A =
11.25 A
1.4
2.5
15
0.875 * 15 A =
12.38 A
1.0
2
17
1.0 * 15 A =
15 A
0.7
1.7
Rated motor current =
5 A
3.8
5