UR 9UH GE CPU Module

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UR 9UH

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Description - CPU Module

UR 9UH

The GE Multilin UR 9UH (or UR-9UH) is a CPU module for the Universal Relay series. It is commonly used in G60 generator management relays. This module is responsible for handling the data, communication, and protection functions of the relays, and includes RS485 and Ethernet (100BaseFx/100BaseT) interfaces.

Parameter - CPU Module

UR 9UH

Product Type:CPU Module
Compatibility:GE Multilin UR Series (Universal Relays)
Communication Ports:10/100Base-T Ethernet (RJ45), RS485 serial, 100Base-FX fiber optic
Supported Protocols:IEC 61850, DNP3, Modbus, IEEE C37.118
Response Time:< 5 ms
Operating Temperature:-40 °C to +70 °C
Storage Temperature:-40 °C to +85 °C

FAQ - CPU Module

UR 9UH

Q: What is the role of the UR 9UH in a G60 generator protection system?
The UR-9UH is the central processing unit for the Universal Relay (UR) platform. It is responsible for executing protection algorithms, real-time control logic, and managing all data communication between the relay and the SCADA/DCS system. It processes inputs from CT/VT modules and issues trip commands based on configured logic, ensuring sub-cycle response times for generator fault conditions .

Q: Is the UR 9UH compatible with older CT/VT modules or other UR series hardware?
This is a critical engineering consideration. The UR-9UH is part of the "new" UR hardware generation. It is only compatible with the newer CT/VT modules (Order Codes 8F through 8R) which typically feature blue labels. If you attempt to mix a UR 9UH CPU with an older generation CT/VT module (e.g., 8A-8D), the relay will not function and will display a HARDWARE MISMATCH or DSP ERROR. 

Q: What communication interfaces are available, and which protocols are supported for integration?
The UR 9UH features a robust suite of communication interfaces including:
1 x RS485 Serial Port (Modbus RTU/DNP3)
2 x 100BaseFX Multimode LC Optical Fiber Ethernet Ports
1 x 100BaseT RJ45 Copper Ethernet Port
It supports industry-standard protocols essential for power system integration: IEC 61850 (Ed. 1 & 2), DNP3 (Serial & TCP/IP), Modbus RTU/TCP, and IEEE C37.118 for synchrophasors . The multiple fiber ports allow for redundant network topologies (e.g., PRP/HSR) to ensure zero-failover communication in mission-critical substations.

Q: What are the environmental tolerances for this module?
The UR 9UH is designed for harsh substation and industrial plant environments. Certified to IEEE 1613 and IEC 60255 standards, it operates reliably within a temperature range of -40°C to +70°C (-40°F to +158°F) . This wide range ensures the CPU remains stable even in unheated outdoor relay cabinets or high-temperature generator halls.

Model Comparison - CPU Module

Feature

UR-9UH

Legacy CPU (e.g., 9C, 9D)

Label Indicator

Blue Label (New Gen)

Red/White Label (Old Gen)

Firmware Compatibility

V4.0x and Higher

V3.4x and Lower

CT/VT Module Compatibility

Only 8F-8R Series (Enhanced Diagnostics)

Only 8A-8D Series

Ethernet Options

100BaseFX (Fiber LC) + 100BaseT (RJ45)

10BaseF (Fiber ST) / 10BaseT

Managed Switch Capability

Compatible with 9S CPU (Managed Switch Option)

Not Supported

IEC 61850 Ed. 2 Support

Yes (Firmware dependent)

Limited/No

Environmental Rating

-40°C to +70°C

Typically 0°C to +60°C (Varies by model)