Dimensional drawings

Circuit diagrams

Assets

Application

The MICROMASTER 420 inverter is suitable for a variety of variable-speed drive applications.

It is especially suitable for applications for pumps, fans and conveyor systems.

It is the ideal cost-optimized frequency inverter solution. The inverter is especially characterized by its customer-oriented performance and ease-of-use. Its large supply-voltage range enables it to be used all over the world.

Design

The MICROMASTER 420 has a modular design. The operator panels and communication modules can be easily exchanged without requiring any tools.

Main characteristics

• 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

Options (overview)

• 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
  • PROFIBUS
  • DeviceNet
  • CANopen
• 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

International standards

• 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

Mechanical features

• 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

Performance features

• 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)

Protection features

• 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