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© National Instruments Corporation 13 MID-7654/7652 Servo Power Motor Drive User Guide
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.
YourMID-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 at25% duty cycle, you may still bewithin
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.
Setting Motor Inductance Levels
Depending on the construction of your motor, you may need to configure
one or more axes to the low inductance setting rather than the default
standard inductance setting. Table 6 shows the motor inductance level
ranges for the two different settings.
Table 6. Motor Inductance Levels
Motor Inductance MID-7654/7652 Setting
Greater than 440 µH Standard
Between 110 and 440 µH Low