Application Scenarios

Within the control cabinet of a continuous chemical processing line, dozens of ABB AC 800M PLC modules, remote I/O stations, and field instruments rely on a flawless 24VDC power source. Any fluctuation or interruption in this power can cause processor resets, signal errors, or even an unplanned process shutdown. The SCHUMACHER TP858 3BSE018138R1​ is deployed as the heart of this 24VDC power distribution system. Its primary role is to convert the plant’s unreliable 120/230VAC mains power into a perfectly regulated and filtered 24VDC output. It features active power factor correction (PFC) to maintain high efficiency and minimize harmonic distortion on the plant’s electrical network. More importantly, its high MTBF rating and robust design address the key pain point of system uptime. In the event of a brief input voltage dip, its large buffer capacitors and wide input voltage range ensure the output remains stable, preventing nuisance faults. For critical loops, multiple TP858​ units can be configured in redundant, parallel operation with decoupling diodes, ensuring that a single PSU failure does not cripple the entire automation system, thereby guaranteeing process continuity and safety.

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Technical Principles and Innovative Values

Innovation Point 1: Advanced Topology with Active Power Factor Correction. The SCHUMACHER TP858 3BSE018138R1​ utilizes a modern switching topology incorporating Active Power Factor Correction (PFC). This technology ensures the input current waveform closely follows the input voltage waveform, achieving a near-unity power factor (>0.95). This is a significant advantage over basic passive PFC designs. It reduces the reactive power drawn from the mains, minimizes harmonic currents that can distort the plant’s electrical supply, and often allows the unit to operate on a lower-rated input circuit breaker, leading to lower infrastructure costs and improved energy efficiency at the system level.

Innovation Point 2: Built-in Redundancy for Critical System Availability. A key differentiator is its integrated design for N+1 redundant parallel operation. The unit features a dedicated “redundancy decoupling” circuit and status signal contacts. When two or more TP858​ units are connected in parallel to a common output busbar through external decoupling diodes, they share the load. If one unit fails, the other(s) seamlessly and instantaneously take over the full load without any interruption in the 24VDC supply. This hot-standby capability is crucial for high-availability applications in process industries, where a power supply failure cannot be allowed to cause a system shutdown, directly translating to increased plant reliability and safety.

Innovation Point 3: Robust Design for Harsh Industrial Environments. The TP858​ is engineered for reliability. Its convection-cooled design (fanless) eliminates a common point of failure—the cooling fan—and prevents dust accumulation on internal components. The wide operating temperature range (-25°C to +70°C) and high immunity to electrical noise and voltage transients (as per industrial EMC standards) ensure stable operation in electrically noisy industrial panels and in locations with significant ambient temperature swings. This ruggedness results in a high Mean Time Between Failures (MTBF), reducing lifecycle costs and unplanned maintenance.

Application Cases and Industry Value

Case Study: Water Treatment Plant SCADA System Upgrade. A regional water authority upgraded its aging supervisory control and data acquisition (SCADA) system across multiple remote pump and valve stations. Each site’s new control cabinet housed an ABB AC 500 PLC, telemetry radios, and network switches. The SCHUMACHER TP858 3BSE018138R1​ was chosen as the central 24VDC power source for its reliability and redundancy features. At a critical booster station, two TP858​ units were installed in a parallel redundant configuration. Several months after commissioning, a lightning-induced surge on the AC mains damaged one of the units. The redundancy system worked flawlessly; the second TP858​ immediately carried the entire load, and a fault signal was sent to the SCADA system, alerting operators to the issue without causing a station shutdown. The maintenance team replaced the faulty unit during a routine visit, with zero impact on water supply. The plant engineer highlighted the system’s “five-nines” availability and the value of the built-in redundancy signaling for predictive maintenance.

Case Study: Automotive Manufacturing Robotics Cell. In an automotive body shop, a robotic welding cell controlled by a Siemens S7-1500 PLC experienced intermittent faults traced to a noisy and unstable 24VDC supply from an older, lower-quality power supply. The noise was causing sporadic communication errors on the PROFINET network. Replacing the supply with a SCHUMACHER TP858 3BSE018138R1​ provided a clean, stable voltage with excellent noise immunity. The unit’s high efficiency also reduced thermal loading inside the control cabinet. The result was a complete elimination of the communication faults, leading to a 15% reduction in cell downtime due to electrical issues. The production manager noted the improvement in Overall Equipment Effectiveness (OEE) and the reduced maintenance troubleshooting time.

Related Product Combination Solutions

ABB CP-C 1/1:​ A compact circuit breaker or fuse holder often used on the input side of the TP858​ to provide branch circuit protection as per electrical codes.

ABB 3BSE018138R2 (TP859):​ A likely variant in the same series, possibly with a different output current (e.g., 5A or 20A), allowing for scalable power solutions within the same product family.

ABB 1SAP250100R0001:​ A common DC/DC converter or voltage conditioner that might be used downstream of the TP858​ to create isolated 24VDC supplies for sensitive analog loops or different voltage rails.

Phoenix Contact 2900334 (or similar):​ A standard decoupling diode module specifically designed for creating redundant power supplies with units like the TP858. ensuring proper load sharing and isolation.

ABB 3BSE007211R1 (PS501):​ A power supply module from ABB’s AC 800M PLC system. The TP858​ could serve as a robust, higher-capacity system power source feeding a cabinet that contains several such PLC system PSUs.

Siemens 6EP1332-1SH71:​ A comparable Siemens SITOP PSU, representing a competitor’s product. The TP858​ is a direct alternative in applications where brand-agnostic or best-in-class performance is specified.

ABB 1SVR405647R0000 (CP-S. 1P):​ A surge protection device (SPD) that would be installed in parallel on the AC input to protect the TP858​ from voltage spikes and transients, extending its service life.

Installation, Maintenance, and Full-Cycle Support

Installation of the SCHUMACHER TP858 3BSE018138R1​ is straightforward for qualified electricians. It snaps onto a standard 35mm DIN rail. The input (L, N, PE) and output (+, -) connections are made via clearly marked, robust screw terminals suitable for standard wire gauges. For redundant operation, the output terminals must be connected to a common DC busbar through external decoupling diodes, and the “redundant” and “alarm” signal contacts wired to the control system for monitoring. The unit requires no configuration; it is operational once powered. However, it is crucial to ensure adequate ventilation and adhere to the specified torque for the terminal screws.

Maintenance is minimal due to the unit’s fanless, solid-state design. Routine maintenance primarily involves a visual inspection for signs of overheating or damage, checking the tightness of connections during scheduled shutdowns, and monitoring its status. The unit provides a green “Power OK” LED and a relay contact that can signal a fault (e.g., no output voltage). In a redundant setup, the system can alert operators to a PSU failure via this contact, allowing for planned replacement without downtime. The high MTBF and robust construction typically result in a long, trouble-free service life.

We provide comprehensive support for the SCHUMACHER TP858 3BSE018138R1. We supply genuine, factory-new units with full manufacturer certification. Our technical team can assist with sizing calculations for your load, designing redundant power schemes, and selecting appropriate protective devices (fuses, circuit breakers). We understand that power supplies are the foundation of any control system, and we are committed to providing reliable products and expert advice to ensure the unwavering performance of your automation infrastructure.

Build your system on a foundation of reliable power. Contact us for the SCHUMACHER TP858 3BSE018138R1 and expert application support.