This document is a comprehensive guide for the MICROMASTER 420 universal frequency inverter, providing information on installation, debugging, control methods, system parameters, troubleshooting, technical specifications, and optional accessories.
The Siemens MICROMASTER 420 manual provides detailed instructions for safe installation, wiring, and mechanical mounting of the variable frequency drive. It covers environmental requirements, grounding, and EMC measures to ensure reliable operation.
The guide also explains commissioning steps, parameter configuration, communication setup, troubleshooting, and includes full technical specifications and optional accessories. Safety warnings and certification information are included throughout. This manual is written in Chinese.
| Input voltage range (single‑phase) | 200 V to 240 V ±10 % |
|---|---|
| Input frequency | 47 Hz – 63 Hz |
| Output frequency | 0 Hz – 650 Hz |
| Power factor | 0.98 |
| Efficiency | 96 % – 97 % |
| Overload capability | 150 % of rated current for 60 s (5 min cycle) |
| Digital inputs | 3 programmable, isolated |
| Analog input | 0 – 10 V for frequency setpoint or PID feedback |
| Relay output | 30 V DC / 5 A (resistive) or 250 V AC / 2 A (inductive) |
| Protection class | IP20 |
| Operating temperature range | -10 °C to +50 °C |
It provides three programmable, electrically isolated digital inputs that can be configured as high‑ or low‑level signals.
The maximum output frequency is 650 Hz.