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MID-7604/7602 Power Drive 14 ni.com
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.
You can configure the MID-7604/7602 stepper drivers in a current
reduction mode on a per-axis basis. This configuration is useful to
minimize motor heating when you are not stepping. With current reduction
enabled, the current decreases by 50% when no stepping has occurred for
approximately 500 ms. DIP switch 5 controls current reduction on a
per-axis basis. When this DIP switch is on, current reduction is enabled.
When this DIP switch is off, current reduction is disabled. The factory
default setting is current reduction enabled.
Table 4 shows the available settings for DIP switch 5.
Table 4. Current Reduction DIP Switch Settings
Switch Setting Operation
Current reduction enabled
(factory default)
Current reduction disabled
5
O
N
5
O
N