1 Overview of the 5345/5445
Microstep Indexer/Drive
In this Chapter
This Chapter introduces the 5345/5445 Microstep Indexer/Drive.
Topics covered are:
5345/5445 definition
System diagram
How to use this manual
1.1 5345/5445 Definition
Overview
The Pacific Scientific
5345/5445 Microstep Indexer/Drive
combines a high-performance, bipolar chopper drive with a
Pacific Scientific StepperBASIC
programmable indexer for
stepper motor motion control.
Drive features
Output current - 5.0 Amps per phase in full step mode (2.5
Amps per phase for the 5345) and 3.5 Amps per phase in
microstep mode (1.75 Amps per phase for the 5345).
Bipolar chopper drive -controls motor current at 20 KHz
chopper frequency.
Internal power supplies -operates from either the 120 or 230
Vac input. The main motor supply consists of a full wave bridge
rectifier into a capacitive input filter.
Shunt regulator circuitry -protects the drive by removing
energy from the supply if the dc bus voltage exceeds 84 volts.
This feature protects the circuitry from excessive voltage that
may be generated under certain motor deceleration conditions.
Short circuit protection circuitry - latches the drive off and
lights the DISABLE LED if a short circuit occurs on the motor
outputs. After removing the short circuit, the DISABLE LED
will go off. Reset the 5345/5445 by cycling power.
Rev F
5345/5445 Installation and Hardware Manual
1 - 1
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