National Instruments NI MID-7604 Overview

Stepper and Servo Motor Drives
NI MID-7604, NI MID-7602
• High-efficiency, bipolar chopper
stepper drives
• User-selectable microstepping
and peak current
• Integrated power supply
• CE approved and UL recognized
NI MID-7654, NI MID-7652
• High-efficiency servo amplifiers
• User-selectable peak current
and continuous current
• Integrated power supply
• CE approved and UL recognized

Overview and Applications

The National Instruments MID-760x integrated stepper motor
power drives and MID-765x integrated DC-brush servo motor
power drives offer reliable, easy-to-connect drive solutions for
National Instruments motion controllers. The NI MID-760x
provides stepper motor control from the NI 7330, 7340, and 7350
controllers. The MID-7650 provides DC-brush servo motor control
from NI 7340 and 7350 controllers. Because the MID-760x and the
MID 7650 have all the required motion drive and motion I/O signals,
they offer all the features of a universal motion interface wiring
module with the enhancements of a powered motor drive in a single
product. The NI MID power drives connect to motion controller
boards through a single-shielded cable that transfers all motor
commands, as well as motion I/O control and feedback signals.
The MID-7604 and MID-7602 are 4-axis and 2-axis stepper motor
drive units, respectively. The MID-7654 and MID-7652 are 4-axis
and 2-axis DC-brush servo motor drive units, respectively.
Model Stepper
MID-7604
MID-7602
MID-7654 –
MID-7652 –
Figure 1. Stepper and Servo Motor Drive Features
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National Instruments • Tel: (800) 433-3488 • Fax: (512) 683-9300 • info@ni.com • ni.com
NI 7350
Servo NI 7330 NI 7340
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These compact, well integrated drives incorporate per-axis
amplifiers, motor-power DC bus supplies, low-voltage motion I/O
supplies, and pluggable screw terminal connectivity in a single
rugged metal enclosure. This optimized system wiring design
simplifies motion component selection.

High-Efficiency Architecture

The MID-760x power drives incorporate an efficient bipolar chopper
architecture that converts step and direction control signals into
winding currents for 2-phase stepper motors. The MID-765x power
drives incorporate an efficient servo amplifier architecture that
converts analog control signals into winding currents for DC-brush
motors. The pulse width modulation driver technology in the
MID-765x accurately controls motor winding current, while
reducing motor heating, lowering ripple current, and improving
overall motor performance. Active fan cooling provides optimal
motion power drive operation.
Compact
Motor Drive Current/Axis
(V) (A) Diagnostic LEDs
24 0.2 to 1.4
24 0.2 to 1.4
48 0.8 to 5 continous
10 peak
48 0.8 to 5 continous
10 peak
Front Panel Front Panel
Enclosure and Selectable Selectable
Microstepping Peak Current Axes
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4
2
4
2