Siemens 6EP1931-2EC21

Brand: Siemens
Model: 6EP1931-2EC21

Siemens 6EP1931-2EC21

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Product features

Siemens 6EP1931-2EC21 is a dependable offline DC UPS module developed for industrial automation applications. This 24V DC UPS, part of Siemens' SITOP product series, provides reliable backup power to protect essential equipment such as PLCs, HMIs, and industrial control devices during unexpected power outages. With a rated input of 24V DC/16A and an output of 24V DC/15A (360W), the Siemens 6EP1931-2EC21 provides constant power to keep your gadgets running when the main power fails. Its quick switchover time of less than 10ms eliminates data loss and system shutdowns, making it perfect for critical industrial applications.The module accepts 24V lead-acid batteries, and the backup time varies according to battery capacity-for example, 10 seconds with a 1.2Ah battery, 1 minute with a 7Ah battery, and 2 minutes with a 12Ah battery.

The Siemens 6EP1931-2EC21 boasts high levels of safety and durability. It has built-in protection against reverse polarity and short circuits, which ensures safe operation in severe industrial conditions. The module has an IP20 rating, which prevents solid objects larger than 12mm from entering, and it operates reliably in temperatures ranging from -25°C to +60°C. It may be easily installed on a conventional DIN rail (EN 60715 35×7.5/15) with minimal spacing restrictions, allowing it to integrate neatly into existing control cabinets.

User-friendly LED indicators show the module's status at a glance: green for regular operation, yellow for battery backup mode, and red for alarms such as low voltage or battery difficulties. A red flashing light indicates that the battery requires replacement, simplifying maintenance. The Siemens 6EP1931-2EC21 is CE and cULus certified (UL 508, CSA C22.2 No.107.1) and satisfies EMC Class B emission standards, assuring compliance with global industrial laws.

Specifications

Model	6EP1931-2EC21
Product Type	SITOP DC UPS Module
Rated Input	24 V DC / 16 A
Rated Output	24 V DC / 15 A (360 W)
Weight	0.4 kg
Voltage Range	22 V DC ~ 29 V DC
Mounting	DIN Rail
Dimensions (W×H×D)	50 × 125 × 125 mm

Precautions

When using the Siemens 6EP1931-2EC21 DC UPS module, take the following steps to ensure safe, dependable operation and extend the product's lifespan. The Siemens 6EP1931-2EC21 is only suitable for DIN rail mounting (EN 60715 35×7.5/15) and should not be mounted on a wall. Follow the installation instructions carefully. Maintain a minimum clearance of 50mm above and below the module for proper heat dissipation; insufficient space might lead to overheating and poor performance. For installations above 2000 meters altitude, reduce power by 7.5% per 1000 meters or lower ambient temperature by 5°C, as high altitudes influence thermal management.

Battery management is crucial for the Siemens 6EP1931-2EC21. Only use suitable 24V lead-acid batteries; using other battery types (such as lithium-ion without proper protection) may result in problems or safety risks. Check the battery connections on a regular basis to guarantee secure, corrosion-free terminals; weak wires can cause poor charging or a sudden backup failure. When the red LED flashes, replace the battery right away to avoid losing backup capabilities during power outages. Note that the charging current is factory-set to around 0.7A (with an optional 0.35A setting), so do not change it without consulting the official handbook to avoid battery damage.

FAQ

Q: What is the Siemens 6EP1931-2EC21, and what is its primary function?

A: The Siemens 6EP1931-2EC21 is a 24-volt DC UPS (Uninterruptible Power Supply) module from the Siemens SITOP product line. Its primary role is to supply buffer backup power to important 24V DC loads during a main power outage. It serves as a bridge, allowing processes to run uninterrupted, measurements to be collected, and communication systems to stay operational during brief power outages.

Q: How is the module configured and monitored?

A: Configuration is done using DIP switches on the module, which allow you to configure important parameters including the battery connection threshold, charging end voltage, charging current (0.35A or 0.7A), and bridge duration. A multi-LED display and floating relay connections give detailed status information, indicating normal operation, battery operation (>85% charge), and alert circumstances (e.g., battery defect or low voltage).

Q: What certifications does the Siemens 6EP1931-2EC21 hold?

A: The module has key international safety and quality certifications, such as the CE mark and UL/cUL accreditation. It also meets marine application standards, as evidenced by DNV and ABS approvals, making it appropriate for a variety of demanding situations.