Siemens SITOP DC UPS 6EP1931-2DC42 User Manual

© Siemens AG, 2009 1/18
Considerations for Use
of the SITOP DC UPS Module
6A without interface (6EP1931-2DC21)
6A with serial interface (6EP1931-2DC31)
6A with USB interface (6EP1931-2DC42)
15A without interface (6EP1931-2EC21)
15A with serial interface (6EP1931-2EC31)
15A with USB interface (6EP1931-2EC42)
40A without interface (6EP1931-2FC21)
40A with USB interface (6EP1931-2FC42)
500S (15A / 2.5kWs capacitor) (6EP1933-2EC41)
500S (15A / 5kWs capacitor) (6EP1933-2EC51)
500P (15A / 5kWs capacitor) (6EP1933-2NC01)
500P (15A / 10kWs capacitor) (6EP1933-2NC11)
Release 2

Siemens SITOP DC UPS 6EP1931-2DC42 Specifications

General

Input Voltage	24 V DC
Output Voltage	24 V DC
Output Current	10 A
Power	240 W
Protection Class	IP20
Battery Type	Lead-acid or lithium-ion
Backup Time	Depends on battery capacity and load
Interfaces	USB
Weight	1.5 kg
Storage Temperature	-40 to +85 °C

Summary

Principle Functions

Normal Mode Operation

Describes UPS operation when input voltage is within normal parameters.

Buffer Mode Operation

Describes UPS operation when input voltage drops below the set threshold.

UPS Settings and Configuration

Setting the Cut-in Threshold

Configures the input voltage level that triggers the switch to battery mode.

Setting the End-of-Charge Voltage

Defines the target voltage for battery charging completion.

Setting the Charging Current

Configures the current used for charging the connected battery module.

Setting the Buffering Time

Determines the duration for which the UPS provides backup power.

UPS Signaling and Status

Alarm Message Interpretation

Details various alarm conditions, their causes, and indicators.

Lack of Buffer Readiness

Explains indicators and causes for the UPS being unable to provide buffer readiness.

Battery Change Required

UPS Operating Modes

Long Power Failure (No Interface)

Brief Power Failure (No Interface)

Long Power Failure (With Interface)

Brief Power Failure (With Interface)

Battery Module Management

Battery Module Selection Guide

Lead-Gel Battery Discharge Characteristics

Battery Capacity Calculation