Description
Hard-Numbers: Technical Specifications
- Processor Core: 533MHz embedded CPU + 32-bit DSP (high-performance gen)
- Communication Ports: 2×RS485 (Modbus RTU), 1×10/100Base-T Ethernet (Modbus TCP, IEC 61850)
- Redundancy: Parallel Redundancy Protocol (PRP) + N+1 CPU redundancy
- Time Sync: IEEE 1588 Precision Time Protocol (sub-microsecond accuracy)
- Logic Execution: 1ms scan rate; supports 1200+ logic elements
- Operating Temperature: -40°C to +70°C (substation industrial grade)
- Isolation Rating: 2500Vrms (backplane-to-field reinforced isolation)
- Power Draw: 9.0W (backplane supplied; highest in UR CPU line)
- Memory: 256MB SDRAM; 512MB flash (firmware, settings, fault records)
- Hot-Swap: Yes (live insert/remove; auto-sync config)
- Dimensions: 150mm × 180mm × 40mm
- Weight: ~0.84kg (1lb 13oz)
- Software: Configured via EnerVista UR software
UR-8LH
The Real-World Problem It Solves
Legacy UR CPUs (UR-9CH/9DH/9EH) lacked native redundancy and high-speed IEC 61850, limiting critical substation reliability. UR-9GH was the premium redundant solution for Rev A/B I/O chassis, delivering PRP, IEEE 1588, and high processing power until discontinuation in 2018.
Where you’ll typically find it:
- High-voltage transmission substations (230kV–500kV) with G60 (generator), T60 (transformer) relays
- Fossil fuel/nuclear power plants requiring redundant protection and precise time sync
- Large industrial complexes (steel, petrochemicals) with medium-voltage switchgear and generator auxiliaries
- Critical distribution hubs needing IEC 61850 for grid modernization
Bottom line: It’s the legacy high-end UR system core—redundant, precise, powerful, for critical protection applications (now obsolete; replacement: UR-9AH).
Hardware Architecture & Under-the-Hood Logic
UR-9GH is the premium redundant master controller, optimized for high performance and fault tolerance with Rev A/B I/O.
- Backplane interface supports Rev A/B 8CT/VT (UR-8LM/8LV/8NH) I/O modules.
- 533MHz CPU runs logic, communications, and redundancy management; DSP processes analog data.
- PRP controller manages redundant Ethernet paths; ensures zero data loss during network faults.
- IEEE 1588 module synchronizes time across substation to <1µs for event correlation.
- IEC 61850 stack enables interoperability with modern substation devices.
- Hot-swap controller enables live insertion; auto-loads config from non-volatile memory.
- EnerVista UR software connects via comms ports for setup, monitoring, and firmware updates.
Field Service Pitfalls: What Rookies Get Wrong
Mismatching UR-9GH (Legacy High-End) with Rev C+ I/OTechs pair UR-9GH (Rev A/B I/O only) with newer Rev C+ 8xx I/O modules. This causes HARDWARE MISMATCH / PRP ERROR—relay fails to boot or loses redundancy.
- Field Rule: UR-9GH ↔ Rev A/B I/O; UR-9AH ↔ Rev C+ I/O. Never cross-generate.
Ignoring End-of-Life Status & Replacement PathTechs deploy new UR-9GH modules unaware of 2018 discontinuation. Spare parts are scarce; firmware updates ceased.
- Field Rule: For new installations, use UR-9AH (current gen). For existing UR-9GH systems, stock spares or plan migration to UR-9AH.
Underpowering Legacy Chassis with UR-9GHTechs fill 12-slot legacy chassis with UR-9GH (9.0W) + 8xx I/O (6–7W each). Total power exceeds 55W; CPU resets randomly or PRP fails.
- Field Rule: Budget 9W/UR-9GH + 7W/I/O; keep total <50W; use redundant power supplies for 8+ slots.
UR-8LH
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
