Micromaster MM420

Easy, guided start-up

Modular construction allows maximum configuration flexibility

Three fully programmable isolated digital inputs

One scalable analog input (0 V to 10 V) can also be used as a 4th digital input

One programmable analog output (0 mA to 20 mA)

One programmable relay output
30 V DC/5 A, resistive load
250 V AC/2 A, inductive load

Low-noise motor operation through high pulse frequency, adjustable (observe derating if necessary)

Complete inverter and motor protection

EMC filter, Class A/B

LC filter

Line commutating chokes

Output chokes

Gland plates

Basic Operator Panel (BOP) for parameterizing the inverter

Advanced Operator Panel (AOP) with multi-language plain text display

Asian Advanced Operator Panel (AAOP) with Chinese and English plain text dis­play

Cyrillic Advanced Operator Panel (CAOP) with Cyrillic, German and English plain text display 

Communication modules

PC connection sets

Mounting kits for installing the operator panels in the control cabinet doors

PC start-up programs exe­cutable under Windows 98/NT/2000/XP Professional

TIA integration with Drive ES

The MICROMASTER 420 inverter complies with the requirements of the EU low-voltage guideline.

The MICROMASTER 420 inverter has the CE marking.

Acc. to u_L and cu_L certified

c-tick

Modular design

Operating temperature: -10 °C to +50 °C (+14 °F to +122 °F)

Compact housing as a result of high power density

Easy cable connection, mains and motor connections are separated for optimum electromagnetic compatibility

Detachable operator panels

Screwless control terminals

Latest IGBT technology

Digital microprocessor control

Flux current control (FCC) for improved dynamic response and optimized motor control

Linear V/f characteristic

Quadratic V/f characteristic

Multipoint characteristic (programmable V/f characteristic)

Flying restart

Slip compensation

Automatic restart facility following mains failure or fault

Internal PI controller for simple process control

Programmable acceleration/deceleration, 0 s to 650 s

Ramp smoothing

Fast current limit (FCL) for trip-free operation

Fast, repeatable digital input response time

Fine adjustment using a high resolution 10-bit analog input

Compound braking for rapid controlled braking

Four skip frequencies

Removable "Y" capacitor for use on IT systems (with non-grounded mains supplies, the “Y” capacitor must be removed and an output choke installed)

Overload current 1.5 x rated output current (i.e. 150 % overload capability) for 60 s, cycle time 300 s

Overvoltage/undervoltage protection

Inverter overtemperature protection

Motor protection using PTC via digital input (possible with supplementary circuit)

Earth fault protection

Short-circuit protection

I²t motor thermal protection

Locked motor protection

Stall prevention

Parameter interlock

The EMC product standard EN 61 800-3 does not apply directly to a frequency inverter but to a PDS (Power Drive System), which comprises the complete circuitry, motor and cables in addition to the inverter.

As a rule, frequency inverters are only supplied to qualified technical specialists for installation in machines or plants. A frequency inverter must therefore only be considered as a component which, as such, is not subject to the EMC product standard EN 61 800-3. However, the inverter's instruction manual specifies the conditions under which the product standard can be complied with if the frequency inverter is expanded to become a PDS. For a PDS, the EMC directive in the EU is complied with through observance of the product standard EN 61 800-3 for variable-speed electrical drive systems. The frequency inverters on their own do not generally require marking according to the EMC directive.

The new EN 61 800-3 of July 2005 no longer distinguishes between "general availability" and "restricted availability". Instead, different categories, namely C1 to C4, are defined according to the environment of the PDS at the place of use:

In the EMC product standard EN 61 800-3, limits for conducted interference voltages and radiated interference are also indicated for the so-called "second environment" (= industrial power supply systems which do not supply households). These limits are lower than the limits of filter class A according to EN 55 011. The use of unfiltered inverters in an industrial environment is permissible provided they are part of a system that is equipped with line filters on the higher-level infeed side.

With MICROMASTER, power drive systems (PDS) which comply with EMC product standard EN 61 800-3 can be installed (see the installation instructions in the product documentation). The table entitled "Overview of MICROMASTER components and PDS categories" and the MICROMASTER ordering documents show which components the respective PDS installation supports directly. 

In general, a distinction must be made between the product standards for electrical drive systems (PDS) of the EN 61 800 series of standards (of which Part 3 covers EMC topics) and the product standards for devices/systems/machines etc. This will probably not result in any changes in the practical use of frequency inverters. Since frequency inverters are always part of a PDS and the latter is part of a machine, the manufacturer of the machine must observe various standards depending on the type of machine and the environment, e.g. EN 61 000-3-2 for power supply harmonics and EN 55 011 for radio interference. The PDS product standard alone is therefore inadequate or irrelevant.

With regard to compliance with limits for power supply harmonics, the EMC product standard EN 61 800-3 for PDS refers to compliance with the EN 61 000-3-2 and EN 61 000-3-12 standards.

Irrespective of configuration with MICROMASTER and its components, the machine builder can also modify the machines in other ways in order to comply with the EMC directive of the EU. As a rule, the EMC directive of the EU is observed through compliance with the EMC product standards applicable to the machine. If they are not available, the generic standards such as DIN EN 61 000-x-x can be used instead. What is important is that the conducted interference and the radiated interference voltages at the power-supply connection point and outside the machine remain below the corresponding limits. What technical means are used to ensure this is not prescribed.