Introduction - Emerson 2202 Advanced User's Manual

Introduction

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description format
1 Introduction
This Advanced User Guide provides information on the more advanced features and parameters of Commander SK:
• Parameter types
• Keypad and display information
• Modbus RTU serial communications protocol
• PLC Ladder logic programming
• CTSoft Windows™ based commissioning and monitoring tool
• Advanced parameter logic diagrams and full parameter descriptions
• Commander SK Solutions Module logic diagrams and parameter descriptions
Commander SK
The Commander SK is an open loop vector AC variable speed inverter drive used to control the speed of an AC induction motor. The drive uses an
open loop vector control strategy to maintain almost constant flux in the motor by dynamically adjusting the motor voltage according to the load on the
motor.
The AC supply is rectified through a bridge rectifier and then smoothed across high voltage capacitors to produce a constant voltage DC bus. The DC
bus is then switched through an IGBT bridge to produce AC at a variable voltage and a variable frequency. This AC output is synthesized by a pattern
of on-off switching applied to the gates of the IGBTs. This method of switching the IGBTs is known as Pulse Width Modulation (PWM).
Software structure
For the majority of applications, the Commander SK's keypad and display can be used to set up the drive through 'menu 0'. Menu 0 is structured to
give an extreme ease of set-up for a simple drive but with the flexibility for more demanding applications. See the Commander SK Getting Started
Guide for details.
For applications that require extra functionality, the advanced parameters from menu 1 through to menu 21 can be used. These advanced parameters
can be programmed and adjusted using the drives keypad and display or by using CTSoft. Also, the optional LED or LCD keypads can be used to
monitor and adjust parameters.
Options
To further enhance the functionality of the Commander SK, a number of Solutions Modules, SmartStick copying option and a LogicStick PLC ladder
logic option are also available. Details of these can be found on the CD supplied with the Commander SK or at www.controltechniques.com
4
Parameter Keypad and
display communications
www.controltechniques.com
Serial CT Modbus CT Modbus
RTU RTU
Advanced parameter
CTSoft Menu 0
descriptions
Commander SK Advanced User Guide
Issue Number: 9