Siemens 6EP1931-2FC01 SITOP Power DC-USV Module 40
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Product Information
The Siemens 6EP1931-2FC01 SITOP Power DC-USV Module 40 is a heavy-duty 24 V DC uninterruptible power supply component belonging to the SITOP DC UPS family. Designed to safeguard automated industrial machinery against mains supply failures and voltage drops, this module delivers a continuous output current of up to 40 A across a nominal 24 V DC system voltage with an operating input range of 22 to 29 V DC. It serves as a vital power buffering element for large PLC racks, industrial PCs, control circuits, and critical field instrumentation across automotive manufacturing, water and wastewater management, chemical processing, and OEM equipment installations.
Putting a replacement 6EP1931-2FC01 unit into service requires matching the hardware settings on the replacement module to the original panel configuration. The unit features integrated front-panel DIP and rotary switches used to define buffer time duration and set the deep discharge protection threshold. Maintenance technicians must align these physical switches prior to commissioning to match plant requirements. The module interfaces with external SITOP lead-acid battery modules in capacities from 1.2 Ah to 12 Ah, connecting power loads and monitoring signals via front terminal blocks. Technical support from ABC Industrial Parts can assist in verifying setup parameters when deploying a replacement module in existing machine controls.
System status and operational readiness are monitored through four front-panel LEDs and three floating changeover relay contacts. Green LEDs indicate normal operation and high battery charge state, a yellow LED signals active battery buffering mode during supply disruptions, and a red Alarm LED indicates faults such as battery defects, reversed polarity, deep discharge cutoff, or an unrecoverable internal hardware failure. Internal component failures are not field-serviceable, making unit replacement or repair through ABC Industrial Parts the standard solution for restoring system operation.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6EP1931-2FC01 |
| Model / Type | SITOP Power DC-USV Module 40 |
| Product Family | SITOP DC UPS |
| Component Type | DC UPS Module |
| Input Voltage Nominal | 24 V DC |
| Input Voltage Range | 22 - 29 V DC |
| Output Voltage Nominal | 24 V DC |
| Continuous Output Current | 40 A |
| Compatible Battery Modules | SITOP Lead-Acid Battery Modules (1.2 Ah, 3.2 Ah, 7 Ah, 12 Ah) |
| Signal Outputs | 3 floating changeover relay contacts |
Programming and Configuration
The Siemens 6EP1931-2FC01 functions as a standalone hardware module that operates without programming software, software licenses, or digital network interfaces. Parameter assignment is performed entirely via tool-free physical controls on the front panel.
Integrated DIP switches and rotary selectors allow maintenance personnel to specify the buffer duration and adjust the deep discharge cutoff threshold. When replacing a module, matching these switch positions to the original hardware configuration ensures consistent backup behavior and proper battery protection.
Communication and System Integration
Rather than using serial or USB communication buses, the 6EP1931-2FC01 relies on direct hardwired status signaling. It is equipped with three integrated floating changeover relay contacts that connect directly to digital input modules on higher-level PLCs or control systems.
These relay outputs communicate key system states to supervisory controllers, permitting automated tracking of grid power availability, battery readiness, and low-power warnings necessary to initiate controlled shutdown sequences for industrial PCs and PLCs.
Diagnostics and Status Indication
Local status evaluation on the Siemens 6EP1931-2FC01 is provided by four color-coded front-panel LEDs, allowing operators to quickly verify power input, battery charge status, and operational fault conditions.
Complementing visual indications, three floating changeover relay contact outputs transmit real-time state information to higher-level automation systems for central monitoring and alarm handling.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| OK | Green - Solid | Normal operation, input voltage present, battery operational |
| Bat > 85% | Green - Solid | Battery charge level is greater than 85% |
| Buffered | Yellow - Solid | Battery buffering mode active (mains power failure / input under-voltage) |
| Alarm | Red - Solid/Flashing | Battery defect, reversed battery polarity, deep discharge protection activated, or internal hardware error requiring unit replacement |
Replacement and Spare Part Considerations
When installing a spare Siemens 6EP1931-2FC01 module, verify that the front-panel DIP switches and rotary selectors match the original unit's settings to maintain identical buffer time settings and discharge thresholds.
The module is designed for operation with external SITOP lead-acid battery modules available in capacities of 1.2 Ah, 3.2 Ah, 7 Ah, and 12 Ah. Checking battery health and ensuring correct polarity at the wiring terminals is necessary prior to energizing the module.
For modernizing control systems or replacing obsolete hardware, Siemens recommends the SITOP UPS1600 40 A module (part number 6EP4137-3AB00-0AY0) as the updated successor model.
Frequently Asked Questions
How is the Siemens 6EP1931-2FC01 configured during replacement?
Configuration is completed without software tools by setting the integrated front-panel DIP switches and rotary selectors to adjust buffer time duration and deep discharge threshold protection.
Which external battery modules work with the 6EP1931-2FC01?
The module is compatible with SITOP lead-acid battery modules in capacities of 1.2 Ah, 3.2 Ah, 7 Ah, and 12 Ah.
How does the module signal operational status to an external PLC?
The 6EP1931-2FC01 uses three floating changeover relay contacts to transmit operational status, active buffering mode, and alarm conditions to digital PLC inputs.
What conditions trigger the red Alarm LED on the front panel?
The red Alarm LED illuminates or flashes during a battery defect, reversed battery polarity, activation of deep discharge protection, or an unrecoverable internal hardware error.
What is the official successor model for the 6EP1931-2FC01?
The official successor replacement model specified by Siemens is the SITOP UPS1600 40 A under part number 6EP4137-3AB00-0AY0.
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Disclaimer:
We are not an authorised distributor of Siemens.
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