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        • Lifecycle status

          Active / Available from OEM
          Product manuals, quotations and DC UPS model-matching support for 6EP1931-2FC21 are provided by Apter Power.

        6EP1931-2FC21

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Siemens 6EP1931-2FC21 is a SITOP DC UPS module that uses an external battery to maintain a 24 V DC load supply when the input supply fails.
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        Ships by Wednesday, October 28
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 6EP1931-2FC21

        • Manufacturer:
          Siemens
        • Part Number:
          6EP1931-2FC21
        • Product Family:
          Siemens SITOP
        • Product Type:
          SITOP DC UPS 40 A Module
        • Stock:
          1
        • Rated Input:
          24 V DC
        • Input Operating Range:
          22–29 V DC
        • Rated Output:
          24 V DC; 0–40 A
        • Charging Current:
          1 A or 2 A selectable
        • Cut-In Threshold:
          22–25.5 V DC; 0.5 V steps
        • End-of-Charge Voltage:
          26.3–29.3 V DC
        • Buffer Timer:
          5–635 s; 10 s increments
        • Status Contacts:
          2 changeover and 1 normally-open relay
        • Communication Interface:
          None
        • Protection Rating:
          IP20
        • Operating Temperature:
          0 to +60 °C
        • Storage Temperature:
          -40 to +85 °C
        • Relative Humidity:
          5–85%; non-condensing
        • Battery Cable Length:
          3 m maximum
        • Mounting:
          35 mm DIN rail; vertical
        • Weight:
          2.2046 lbs (1 kg)
        • Estimated shipping dimensions:
          14×16×11cm
        • Tariff Code:
          85044060
        • Country of origin:
          Romania
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Status Contacts Protection Mounting Space Battery Test

        Features:

        • The input and battery connections have reverse-polarity protection.
        • Buffer duration can be selected locally.
        • The module indicates normal supply, buffering, battery readiness and charge state.
        The external circuits attached to 6EP1931-2FC21, including signaling and status contacts, must meet the SELV requirements. The signal terminals are part of that installation requirement rather than unrestricted external switching connections.

        The compatibility switch on 6EP1931-2FC21 selects the behavior associated with the new or former DC UPS family. It is a dedicated setting on this execution, not a USB communication command.

        The battery leads connected to 6EP1931-2FC21 are routed together with the smallest practicable loop. Keeping these conductors paired limits the interference coupled into the load circuit.

        The Siemens 6EP1931-2FC21 SITOP DC UPS 40 A Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 6EP1931-2FC21 SITOP DC UPS 40 A Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        Read each indication as a separate operating condition

        • Normal operation: The green DC indication and its relay contact identify operation above the cut-in threshold.
        • Buffer operation: The yellow battery indication and changeover contact identify battery-fed load operation.
        • Charge indication: The charge indicator has a separate normally-open relay contact.
        • Alarm indication: Battery readiness or undervoltage conditions use the alarm indication instead of the normal-operation contact.

        Follow the response appropriate to the active supply path

        • Current limiting: The module limits output current during overload or short-circuit conditions.
        • Input-fed retry: With normal input supply present, a protective shutdown is followed by repeated attempts to restart.
        • Battery-fed shutdown: A shutdown during buffering remains until the input supply returns.
        • Deep discharge: Low battery voltage disconnects the load to prevent further discharge; the input must recover before operation resumes.

        Keep cooling and cable routing compatible with the enclosure

        • Orientation: Mount the module vertically with the input and output terminals and cooling openings at the bottom.
        • Ventilation: Leave clearance above and below the module for cooling airflow.
        • Adjacent equipment: Keep the unit away from commutating chokes rather than mounting directly beside them.
        • Control routing: Route the ON/OFF control circuit separately from power leads, including converter-to-motor connections.

        Distinguish connection monitoring from the periodic check

        • Test interval: Normal input-fed operation includes a periodic battery test.
        • Interrupted interval: Buffer operation or battery disconnection within the interval prevents that scheduled test.
        • Fault indication: A defective battery is indicated by a flashing alarm.
        • Remaining operation: A faulty battery may still provide some buffering, but the normal buffer duration is no longer assured.
        Description
        Siemens 6EP1931-2FC21 is the SITOP DC UPS 40 A module for battery buffering of a DC load supply. It works with an external DC power supply and battery module, rather than combining an AC mains converter and battery inside one enclosure.

        Input L+ and M feed 6EP1931-2FC21, while the load connects to its separate output terminals and the battery connects to the battery terminals. When the input falls below the selected cut-in threshold, the battery path supplies the buffered load; the external power supply feeds the load during normal input operation.

        Charging within 6EP1931-2FC21 first regulates battery current and then holds the selected end-of-charge voltage. The charging process is therefore governed by both a current setting and a final voltage setting, not by the output-load rating alone.

        Buffer termination on 6EP1931-2FC21 can follow a selected time interval or the battery discharge limit. The timer sets when buffering ends under that mode; it does not create additional battery capacity or override the low-battery protection.
        Alternative Names
        6EP19312FC21 6EP1931 2FC21 6EP1 931-2FC21 Siemens 6EP1931-2FC21 6EP1931-2FC21 SITOP DC UPS 40 A Module 6EPI93I-2FC2I 6EPI931-2FC21 SITOP DC UPS 40 A Module 6EP1931-2FC21
        Technical notes
        The Siemens 6EP1931-2FC21 module uses front DIP switches for its cut-in threshold, charging settings and buffer-time selection.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why might 6EP1931-2FC21 supply the load normally but not provide battery backup?
        Battery operation is OFF in the delivery setting of 6EP1931-2FC21. The ON/OFF control must enable buffering; normal input-fed output alone does not confirm that the battery path is enabled.
        Can a USB shutdown command be sent directly to 6EP1931-2FC21?
        No USB interface is provided on 6EP1931-2FC21. USB signaling and remote commands described for the interface-equipped execution do not apply to this part number.
        Does the charge-ready indication on 6EP1931-2FC21 guarantee a fixed remaining run time?
        Available battery capacity still depends on battery condition and aging with 6EP1931-2FC21. The charge indication is not a guaranteed run-time measurement for the connected load.
        Which battery conditions determine the charging settings of 6EP1931-2FC21?
        The selected battery module and its temperature determine the appropriate end-of-charge voltage for 6EP1931-2FC21, while its permitted charge current determines the current setting. The load current rating is not a substitute for those battery limits.
        Is the five-second output interruption always active on 6EP1931-2FC21?
        By default, the interruption option on 6EP1931-2FC21 is disabled. When enabled by DIP switch, it interrupts the output at the end of the buffering time rather than continuously during normal supply.

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