The H7202 (Part No. 985030008) is a compact power distribution/fuse board module designed by HIMA Germany specifically for industrial Safety Instrumented Systems (SIS) and critical process control applications. As an accessory component of the HIMatrix product line, it features redundant, isolated, and monitorable 24VDC/48VDC power distribution for system I/O modules and auxiliary components. Single-channel fault isolation is achieved via independent fuses and fault indication functions. The module complies with the IEC 61508 SIL 3 and higher safety integrity level requirements, and is widely deployed in harsh industrial environments such as petrochemicals, power generation, rail transit, and pharmaceuticals.
Core Specifications & Hardware Design
The model number is H7202 with part number 985030008, which is the original factory standard number for procurement and traceability purposes. The power distribution architecture adopts redundant dual-channel inputs (L+1/L-, L+2/L-), together with multiple independent outputs, supporting redundant dual-power supply with diodes for reverse connection protection and current sharing.
It is equipped with multi-channel independent fuse/breaker slots (compatible with industrial-grade fuses such as E-T-A), and each channel is fitted with an LED status indicator to realize automatic fault isolation. The rated input is 24 V DC or 48 V DC (compliant with HIMA system power supply specifications), featuring wide voltage tolerance and supporting parallel connection of redundant power modules. The rated current of a single channel is selectable (typically 4A/6A/10A, subject to fuse specifications), and the total current shall comply with the rack power limit to meet the power consumption requirements of different I/O modules. For physical specifications, it adopts standard 35 mm DIN rail mounting (compliant with EN 60715) and compact design, facilitating integration into HIMatrix racks or independent control cabinets.
The protection class is IP20 (for the front panel), with a misoperation prevention design for the terminal area, suitable for cabinet installation and meeting the dustproof requirements of industrial environments. The operating temperature ranges from -20°C to +60°C (wide temperature range is optional, subject to confirmation), capable of adapting to extreme working conditions and complying with IEC 60068-2-1/2-2. The electrical isolation voltage between input and output as well as between channels is ≥ 2.5 kV, preventing crosstalk and fault propagation to meet the insulation requirements of SIL 3.
Key Hardware Features
Functions and Working Principles
Power Distribution: Distributes redundant input power to multiple output channels, providing stable power supply for HIMatrix F series I/O modules, communication modules, fan modules, etc.Fault Isolation: When a single-channel fuse blows, only the load of that channel is affected while other channels operate normally. Meanwhile, LED indicators and system diagnostic alarms prompt the fault location.Status Monitoring: Uploads data such as power supply status of each channel, input voltage and current to the system CPU via the backplane communication interface, supporting configuration and monitoring via SILworX engineering software.Protection Mechanism: Features overcurrent, short-circuit and reverse connection protection. It cooperates with upstream power modules to achieve overvoltage and overtemperature protection, forming a multi-level power supply safety protection system.
Application Scenarios & Compatible Systems
- Petrochemicals: Emergency Shutdown Systems (ESD), Fire and Gas Monitoring Systems (FGS), compressor anti-surge control
- Power Industry: Substation safety control, power plant auxiliary equipment protection, new energy grid-connection safety systems
- Rail Transit: Signal system interlocking, platform screen door control, train traction safety monitoring
- Pharmaceuticals & Food: FDA-compliant process safety control to prevent production interruptions and contamination
Installation & Maintenance Guidelines
- Mount horizontally on a standard 35 mm DIN rail, ensuring adequate ventilation and keeping away from heat sources and strong electromagnetic interference sources.
- Connect redundant input power supplies to separate power modules (e.g., F7130A dual redundancy configuration) respectively, and configure appropriate wire diameters and terminals.
- Select fuse specifications for output channels based on the power consumption of I/O modules (HIMA-certified E-T-A fuses are recommended).
- Regularly check the status of LED indicators and record channel operation data on a monthly basis.
- After a fuse blows, first troubleshoot faults on the load side (e.g., short circuit, overcurrent) before replacing it with a fuse of the same specification.
- Conduct a redundancy switchover test every six months to verify the normal operation of the dual-power switchover function.
- Clean the module with dry compressed air and avoid liquid ingress into the module interior.
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