The Siemens MICROMASTER 420 Operating Instructions provide installation, commissioning, control, parameter, and troubleshooting guidance for the inverter.
These operating instructions cover all aspects of the MICROMASTER 420 inverter, including safety warnings, installation steps, commissioning procedures, control modes, system parameters, and troubleshooting tips. The manual also contains detailed technical specifications, optional accessories, and EMC information.
Additional sections provide reference tables, wiring diagrams, and a catalog of compatible components such as filters, chokes, operator panels, and communication modules, helping users select the proper parts for their applications.
| Mains operating voltage | 200 V to 240 V ± 10 % |
|---|---|
| Power range | 0.12 kW – 3.0 kW (0.16 hp – 4.0 hp) |
| Inverter efficiency | 96 % to 97 % |
| Output frequency | 0 Hz to 650 Hz |
| Protection level | IP20 |
The manual warns that the equipment contains dangerous voltages and potentially hazardous rotating parts, that DC link capacitors stay charged for five minutes after power removal, and that only qualified personnel should install, commission, or service the inverter.
Fuses from the SITOR range should be used; for example, a 3 A NA3803 fuse is recommended for the lower power models.
The inverter accepts an input voltage of 200 V to 240 V with a tolerance of ±10 %, and it includes a built‑in Class A filter.