MMP SA-2550A
Page 16 of
24
Midwest Motion Products
DESIGN, MANUFACTURING & DISTRIBUTION - MOTION CONTROL EQUIPMENT
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Loop Tuning Switch Functions
In general, the drive will not need to be further tuned beyond the default configuration. However, for applications requiring more
precise tuning, DIP switches can be used to adjust the current and velocity loop tuning values. Some general rules of thumb to
follow when tuning the drive are:
A larger resistor value will increase the proportional gain, and therefore create a faster response time.
A larger capacitor value will increase the integration time, and therefore create a slower response time.
Proper tuning will require careful observation of the loop response on a digital oscilloscope to find optimal DIP switch settings for
the specific application.
(Note: Drive cover must be removed to access SW3 and SW4)
SW3 DIP switches add additional resistance and capacitance to the current loop tuning circuitry. SW3 switches 1-5 add
additional series resistance to the current loop gain resistor, and SW3 switches 6-10 add additional parallel capacitance to the
current loop integrator capacitor (see Block Diagram). The resulting capacitance and resistance values are given in the tables
below along with the appropriate DIP switch settings. The default switch settings are shaded in the SW3 tables below.
SW3
Switch
Current Loop Proportional Gain Resistance Options (k
)
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
SW3-1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SW3-2
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
SW3-3
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
SW3-4
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW3-5
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
Switch
(continued
)
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
SW3-1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SW3-2
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
SW3-3
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
SW3-4
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW3-5
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW3
Current Loop Integrator Capacitance Options (
F)
Switch
.0047
.0094
.0247
.0294
.0517
.0564
.0717
.0764
.0987
.1034
.1187
.1234
.1457
.1504
.1647
.1694 SHORT
SW3-6
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
SW3-7
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
ON
SW3-8
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
SW3-9
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
SW3-10
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
SW4 DIP switches 1-4 add additional parallel capacitance to the velocity loop integrator capacitor. The resulting capacitance values
are given in the table below along with the appropriate DIP switch settings. The default switch settings are shaded in the SW4 table
below.
SW3
Current Loop Integrator Capacitance Options (
F)
Switch
.0047
.0094
.0247
.0294
.0517
.0564
.0717
.0764
.0987
.1034
.1187
.1234
.1457
.1504
.1647
.1694 SHORT
SW4-1
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
SW4-2
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
ON
SW4-3
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
SW4-4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
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