Siemens: Variable Frequency Drives
MICROMASTER MM420
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The MICROMASTER 420, with its default factory settings and quick commissioning parameter start-up, 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 extended, comprehensive parameter list. The MICROMASTER 420 is an excellent choice for both ‘stand-alone’ applications as well as integrated automation solutions.
Available Ratings
- 1/6 to 7.5HP @ 200-240V ±10%
- 1/2 to 15HP @ 380-480V ±10%
Main Characteristics
- Simple commissioning
- Modular construction allows maximum configuration flexibility
- Three fully programmable, isolated digital inputs with the option for a fourth
- One scalable analog input can also be used as a 4th digital input
- One fully programmable analog output
- One fully programmable relay output
- Silent motor operation is possible when using high switching frequencies
- Complete inverter and motor protection
Performance Features
- Latest IGBT technology
- Digital microprocessor control
- Flux Current Control (FCC) for high starting torque, improved dynamic response, and optimized motor control
- Programmable, multi-point V/Hz curve
- Linear V/Hz control
- Quadratic V/Hz control
- Binary Connector (BiCo) technology
- PI control loop for simple process control
- Fast, repeatable digital input response time
- NPN/PNP Source-Sink control adaptability
- Programmable acceleration/ deceleration, 0 s to 650s
- Multi-curve, adjustable ramp smoothing
- Flying restart
- Slip compensation
- Automatic restart following power failure or fault
- Fast current limit (FCL) for trip free operation
- Fine speed adjustment using a high resolution 10-bit analog input
- Compound braking for rapid controlled braking
- Four skip frequencies
- RS-485 Serial Port with optional RS232
Design
The MICROMASTER 4th Generation has a modular design where operator panels, communications modules, and control options can be fitted by hand as required.
Mechanical Features
- Operating temperature: –10 °C to +50 °C
- Side by side mounting is possible throughout power range, reducing the amount of mounting space required within cabinets
- Easy cable connection: front-accessible mains, motor, and control connections are separated for optimum electromagnetic compatibility
- Detachable operator panels
- Screwless control terminals
Options (Overview)
- Footprint-mount and integrated EMC filters - Class A/B
- Footprint-mount line input reactors
- Footprint-mount output reactors
- Gland plates for conduit termination
- Basic Operator Panel (BOP) for parameterizing an inverter
- Advanced Operator Panel (AOP) with multilingual text display
- Desktop Programming Kit for AOP
- PROFIBUS-DP and other protocol communications modules are optional devices
- Isolated RS232 PC connection kits
- NEMA 4 rated operator mounting kits allowing the BOP/AOP to be mounted in control cabinet doors
- PC commissioning tool
Protection Features
- MM420 Overload capability of 150% of rated load current for a period of 60 seconds with 5 min duty cycle
- MM440 Overload capability of 200% of rated load current for 3 seconds and 150% for 57 seconds with a 5 min duty cycle
- Overvoltage/undervoltage protection
- Inverter overtemperature protection
- Motor protection using PTC via digital input
- Ground-fault protection
- Short circuit protection
- I 2t motor thermal protection
- Locked motor protection
- Stall prevention
- Parameter interlock, using PIN number
International
MICROMASTER 4th Generation is UL and cUL listed and carries the CE mark for conformity to the low voltage directive and will conform to the EMC directive with the appropriate integrated and/or optional filters.
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