©NationalInstruments Corporation 13 MID-7654/7652Servo Power Motor Drive User Guide
Ifyou are connecting m ultiple motors to your MID-7654/7652, verify that
the total powerdissipated by the motors at any given time is less than the
totalpower the drive can provide. If the total power requirement exceeds
thecapability of t he driveat any point, the drive will provide less power to
themotors than desired until the total power requirement drops back down.
YourMID-7654/7652 may overheat under continuous operation with loads
thatexceed specified limits.
Caution Afire safety hazard exists when the total power dissipated by the motors exceeds
400 W at 25% duty cycle for a sustained period of time.
Todetermine the maximum total power dissipation of all of the motors
combined,add up the maximum power each motor can dissipate. If this
valueis less than or equal to 400 W at 25% duty cycle, you will not exceed
the capabilities of the MID-7654/7652.
Ifthe value is greater than 400 W at 25% duty cycle, you may still be withi n
the operating capabilities of the MID-7654/7652, since it is unlikely you
willrun a ll of your motors simultaneously at their maximum levels. Make
areasonable estimation of the maximum power your motors will require at
anygiven 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 moreaxes to the low inductance setting rather than the default
standardinductance setting. Table 6 shows the motor inductance level
ranges for the two different settings.
Table6. MotorInductance Levels
MotorInductance MID-7654/7652 Setting
Greaterthan 440 µH Standard
Between 110 and 440 µH Low