Introduction
Npaq® Hardware Manual
Chapter 1: Introduction
The Npaq® is a high-performance, 6-axis drive rack with field replaceable front-mounted drives. All versions
are 3U in size, rack-mountable, and compatible with the Automation 3200 motion platform.
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3U plug-in drives
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19 inch rack-mount design
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Flexible design provides the ability to drive brush,
brushless, or stepper motors with the same
amplifier
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5 A to 30 A peak output current
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PWM or linear amplifier
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Integral power supplies
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IEEE-1394 FireWire interface
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Digital current, velocity, and position loops for
improved motion stability
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Optional Ethernet for I/O expansion
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Integrated encoder multiplier for higher
throughput and reduced wiring
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Encoder feedback
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NRTL approval and CE compliant
Featuring high-performance double-precision DSPs, the Npaq family performs both current loop and servo-
loop closures digitally to assure the highest level of positioning accuracy and rate stability. It is this
processing capability that allows the Npaq to provide loop closure rates up to 20 kHz and to handle both
digital and analog I/O processing, data collection, laser firing, and encoder multiplication tasks in real time.
Standard options for the Npaq family include integrated encoder multiplication, per-axis brake control logic,
I/O expansion, and integrated emergency stop circuitry.
Figure 1-1:
Npaq Drive Chassis
The Npaq uses plug-in amplifiers supporting both linear and PWM topologies to control brushless, DC brush,
or stepper motor types at up to 320 VDC operating voltage and 30 A peak current capability. The Npaq
contains two configurable power supply sections to support a variety of motors with different operating
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Chapter 1
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