The new SITOP selectivity modules SEL1200 and SEL1400 are the optimal extension for selectivity and rapid fault localization in all 24-V DC power supplies. They distribute and monitor the load current over several current circuits.
If you're currently using mini-circuit breakers to protect 24VDC loads, you may want to take a look at a Siemens SITOP SEL1200 or SEL1400 selectivity module.
SITOP SEL1200 and SEL1400 – Switching or Limiting
The SITOP selectivity modules are specially designed for the response of switched-mode power supply units and the 24 V DC feeders to be supplied. The individual setting of the response threshold allows optimum adaptation to the respective feeder.
The SITOP selectivity modules distribute the load current across several 24 V DC load circuits and monitor them reliably for overload and short-circuit conditions. The electronics permit brief current peaks caused, for example, by high inrush currents, but disconnects feeders in the event of an extended overload. This is ensured even on high-resistance lines and in the case of "creeping" short-circuits. In such cases, miniature circuit breakers fail to trip, or trip too late, even if the power supply unit could deliver the required tripping current. The SITOP expansion module continues to supply the intact feeders with 24 V absolutely free of interruptions and feedback – a feature that avoids a possible total system failure.
SITOP SELECTIVITY MODULE BENEFITS
- Reliable shutdown in case of overload regardless of cable lengths or cable cross-sections
- Choice of 4 or 8 load feeders per module with individually adjustable response threshold from 0.5–3 A, 2–10 A or 3–10 A for each output
- Voltage measuring points for output currents (1 V = 1 A), disconnection of load circuit is not required
- Two options for remote diagnostics: Group signaling contact or single-channel signaling
- Versions with power limitation of the outputs to 100 VA according to NEC Class 2
- Evaluation via free-of-charge SIMATIC S7 or SIMOTION function blocks (S7-1500/1200/300/400) or via LOGO! Software for modules with single-channel signaling (PSE200U)
- Simple configuration thanks to individual setting of maximum current for every output using potentiometers
- 3-color LEDs for fast on-site fault localization
- Remote reset possible from a central location (PSE200U, SEL1200/-1400)
- Simple commissioning thanks to manual switch on/off of outputs (PSE200U, SEL1200/-1400)
- Sequential connection of feeders to reduce total inrush current
- Sealable transparent cover over adjusters for currents and times protects against maladjustment (PSE200U, SEL1200/-1400)
- Library for visualization in SIMATIC PCS 7
The SITOP selectivity module is used in conjunction with 24 V power supplies to distribute the load current over several feeders and to monitor the individual currents. Faults in individual circuits caused by overload or short-circuit are detected and selectively switched off so that further load current paths remain unaffected by the fault. This achieves fast fault diagnostics and minimizes downtimes.
SITOP PSU6200 POWER SUPPLY & SITOP SEL1200 SELECTIVITY MODULE DEMO
Short-circuits can easily occur due to faulty installation or due to damage of the insulation.
How do the PSU6200 and the SEL1200 react in this situation? Watch the new demonstration video below.
SITOP PSU6200 – the all-around power supply
The SITOP PSU6200 product family is the new standard power supply for extreme technical requirements regarding reliability, efficiency and integration. Particularly powerful and rugged, the devices in this line can be used for a variety of purposes and offer extensive functions for targeted diagnostics, fast assembly and reliable operation.
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