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G
ETTING
1
Introduction
590 Series Digital Converter
S
TARTED
System Design
The 590 Series Converter is designed for use in a suitable enclosure, with associated control
equipment. The unit accepts standard three-phase ac supply voltages in the range 110V to 660V,
depending upon the model, and is suitable for the powering of DC shunt field and permanent
magnet motors, providing controlled dc output voltage and current for armature and field.
All units are designed for simple and economical panel mounting using keyhole slots. Plug-in
control connectors simplify the fitting and removal of the unit to the panel.
Where possible, standard parts are used throughout the range thereby reducing the variety of
spare parts required to maintain a multi-drive system. For example, the same basic control
boards are used in all types of three-phase armature controller regardless of horsepower or
bridge configuration.
The control circuit is totally isolated from the power circuit thus simplifying the interconnection
of controllers within a system and improving operator safety. The coding circuitry adjusts
automatically to accept supply frequencies between 45-65Hz and possesses high immunity to
supply-borne interference. The armature controllers are phase rotation insensitive.
Control and Communications
The Converter is controlled by a 16 bit Microcontroller providing advanced features such as:
• Complex control algorithms which are not achievable by simple analog techniques.
• Software-configurable control circuitry built around standard software blocks.
• Serial link communications with other drives or a PC for advanced process systems.
The integral Man-Machine Interface (MMI), with a two-line 16 character display, is a powerful
diagnostic tool. It provides access to all alarms, inputs and principal software blocks in the
controller, whilst the front panel LED indicators give an immediate status display of the drive,
key inputs and outputs.
Regenerative and Non-Regenerative Models
The motor armature controllers include both regenerative and non-regenerative models:
• Regenerative controllers consist of two fully-controlled thyristor bridges and a field bridge
with full transient and overload protection, together with sophisticated electronic control of
acceleration and deceleration, speed and torque in both directions of rotation.
• Non-regenerative controllers consist of one fully-controlled thyristor bridge and a field
bridge with full transient and overload protection, together with its associated electronic
control circuitry, and provide accurate speed and/or torque control in one selected direction
of rotation.
Field Regulator
A field regulator is fitted as standard. The regulator consists of a full-wave half controlled single
phase thyristor bridge with transient and overload protection. It provides either a fixed voltage
or fixed current source, depending upon the selected mode of operation for constant torque
applications. The field current mode of operation can be further enhanced to provide field
weakening for drive control motors which require extended speed or constant horsepower
control.
1-1
Getting Started
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