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1.1

The MICROMASTER 420

The MICROMASTER 420s are a range of frequency inverters for controlling the speed of
three phase AC motors. The various models available range from the 120 W single phase
input to the 11 kW three phase input.
The inverters are microprocessor-controlled and use state-of-the-art Insulated Gate
BipoIar Transistor (IGBT) technology. This makes them reliable and versatile. A special
pulse-width modulation method with selectable Pulse frequency permits quiet motor
operation. Comprehensive protective functions provide excellent inverter and motor
protection.
The MICROMASTER 420 with its default factory settings, is ideal for a large range of
simple motor control applications. The MICROMASTER 420 can also be used for more
advanced motor control applications via its comprehensive parameter lists.
The MICROMASTER 420 can be used in both 'stand-alone' applications as well as being
integrated into 'Automation Systems'.
1.2

Features

Main characteristics
Easy to install, parameterize and commission
Fast repeatable response time to control signals
Comprehensive range of parameters enabling configuration for widest range of
applications
Simple cable connection
Modular design for extremely flexible configuration
High switching frequencies for low-noise motor operation
External options for PC communications, Basic Operator Panel (BOP), Advanced
Operator Panel (AOP) and Profibus Communications Module
Performance characteristics
Flux Current Control (FCC) for improved dynamic response and motor control
Fast Current Limitation (FCL) for operation with trip-free mechanism
Built-in DC injection brake
Compound Braking to improve braking performance
Acceleration/deceleration times with programmable smoothing
Closed-loop control using Proportional, Integral (PI) control loop function
Protection characteristics
Complete protection for motor and inverter
Overvoltage/undervoltage protection
Overtemperature protection for the inverter
Ground fault protection
Short-circuit protection
2
I
16
t thermal motor protection
OVERVIEW
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0

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