MID-7654/7652 Servo Power Motor Drive User Guide
12
ni.com
If you are connecting multiple motors to your MID-7654/7652, 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. Your MID-7654/7652 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 400 W at
25% duty cycle 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 400 W at 25% duty cycle, you will
not exceed the capabilities of the MID-7654/7652.
If the value is greater than 400 W at 25% duty cycle, you may still be within the operating capabilities
of the MID-7654/7652, 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 400 W at 25% duty cycle.
3.00
6.00
1.05
2.10
2.45
4.90
1.00
1.95
2.10
4.20
0.95
1.85
1.95
3.85
0.90
1.80
1.70
3.45
0.85
(default)
1.70
(default)
Table 5.
Continuous and Peak Output Current DIP Switch Settings (Continued)
Switch
Continuous
Current (A)
Peak
Current (A)
Switch
Continuous
Current (A)
Peak
Current (A)
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
