This document is a product manual for Siemens 6EP1931-2EC21/31/42 DC-USV-Modul 15.
The Siemens SITOP DC‑USV‑Modul 15 is a chassis‑mounted UPS unit for DIN‑rail installation. It buffers a portion of the load current of 24 V DC power supplies and supplies the load from an internal battery module when the mains voltage falls below a set threshold.
The manual provides safety warnings, installation guidelines, DIP‑switch settings for cut‑in threshold, charging current, end‑of‑charge voltage and buffering time, as well as details on signalling, serial and USB interfaces, and maintenance procedures. This manual is written in German.
| Input nominal voltage | 24 V DC |
|---|---|
| Maximum input current (battery charged) | 16.0 A DC |
| Maximum input current (battery discharged) | 15.1 A DC |
| Maximum battery current in buffer mode | 15.1 A DC |
| Standby current from battery | ≈ 0.30 mA |
| Loss power (24 V, battery charged) | ≈ 14 W |
| End‑of‑charge voltage range | 26.3 V DC to 29.3 V DC |
| Charging current options | 0.35 A DC or 0.7 A DC |
The module is designed for a nominal input of 24 V DC with an operating range of 22 V to 29 V DC.
The cut‑in threshold is set with three DIP switches, adjustable from 22.0 V to 25.5 V in 0.5 V steps.
Only properly qualified personnel may work on or around the equipment, and only trained personnel may open the unit.