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National Instruments Corporation
11
MID-7604/7602 Stepper Power Motor Drive User Guide
Output Current Settings
The MID-7604/7602 can provide 0.20 to 1.4 A peak (0.14 to 1 A RMS), depending on the peak output
current DIP switch settings for each axis. DIP switches 1 through 4 control the peak output current.
Table 3 shows the DIP switch settings for all possible peak output current settings.
If you are connecting multiple motors to your MID-7604/7602, verify that the total power dissipated by
the motors at any given time is less than the total power the drive can provide. If the total power
requirement exceeds the capability of the drive at any point, the drive will provide less power to the
motors than desired until the total power requirement drops back down. The MID-7604/7602 may
overheat under continuous operation with loads that exceed specified limits.
Caution
A fire safety hazard exists when the total power dissipated by the motors exceeds 80 W
continuous for a sustained period of time.
To determine the maximum total power dissipation of all of the motors combined, add up the maximum
power each motor can dissipate. If this value is less than or equal to 80 W continuous, you will not
exceed the capabilities of the MID-7604/7602.
If the value is greater than 80 W continuous, you may still be within the operating capabilities of the
MID-7604/7602, since it is unlikely you will run all of your motors simultaneously at their maximum
levels. Make a reasonable estimation of the maximum power your motors will require at any given time
and verify that this value is less than 80 W continuous.
Table 3.
Peak Output Current DIP Switch Setting
Switch
Peak Output (A)
Switch
Peak Output (A)
1.40
0.35
1.20
0.30
1.00
0.28
0.85
0.27
0.70
0.25
0.60
0.24
0.55
0.23
0.50
(factory default)
0.20
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4
1
O
N
2 3 4