Siemens SITOP DC UPS 6EP1931-2EC21

© 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 6EP1931-2EC21 Specifications

General

Input Voltage	24 V DC
Output Voltage	24 V DC
Output Current	10 A
Power	240 W
Battery Type	Lead-acid or Lithium-ion
Protection Class	IP20
Signaling	LED indicators
Mounting	DIN rail
Relative Humidity	5 to 95% (non-condensing)

Summary

UPS Module Settings and Configuration

Configuring the Cut-in Threshold Voltage

Configures the input voltage level at which the UPS switches to battery power.

Setting End-of-Charge Voltage

Sets the battery charging termination voltage, dependent on temperature and battery type.

Configuring Battery Charging Current

Configures the constant current used for charging the connected battery module.

Setting the Buffering Time

Defines the maximum duration the UPS will supply power from the battery.

UPS Status Signaling and Indicators

Lack of Buffer Readiness Alarms

Details alarm signals for issues like missing battery or wire faults.

Battery Change Required Alarms

Identifies a defective battery, allowing buffer mode but impacting timing accuracy.

UPS Operating Modes and Scenarios

Long Power Failure (No Interface)

Brief Power Failure (No Interface)

Long Power Failure (With Interface)

Brief Power Failure (With Interface)

Battery Module Management and Selection

Selecting the Appropriate Battery Module

Provides a table to guide the selection of suitable battery modules based on load and backup time.

Battery Discharge Characteristics

Calculating Battery Capacity Requirements

Step-by-step guide on calculating required battery capacity using discharge characteristics.