Description
GE URSHA Technical Specifications:
- Module Type: Analog Output Expansion Card
- Output Type: Isolated Analog Outputs (typically 4-20 mA or 0-5 V)
- Channel Count: Multiple independent output channels (typically 4 channels)
- System Compatibility: GE Multilin UR Series Relays
Functional Features:
- Real-Time Scaling: Continuously maps internal digital values (e.g., current, voltage, power) to proportional analog signals.
- Galvanic Isolation: Provides complete electrical isolation between the relay’s internal logic and the external analog output circuits.
- Configurable Ranges: Output scaling and parameters can be configured via the EnerVista Launchpad software.
- High Resolution: High-resolution Digital-to-Analog Converters (DAC) ensure accurate representation of measured values.
Application Scenarios:
- Integrating UR relays with older SCADA systems lacking digital communication.
- Providing analog inputs to external Data Acquisition (DAQ) systems.
- Driving analog panel meters for local operator visibility.
- Feeding process variables to plant-wide Distributed Control Systems (DCS).
Performance Parameters:
- Accuracy: High-precision output with minimal linearity error and temperature drift.
- Response Time: Fast update rate to reflect rapid changes in system conditions.
- Load Driving: Capable of driving standard industrial loop impedances without signal degradation.
Material Composition & Structural Characteristics:
- Circuit Board: Multi-layer PCB with precision analog components and DACs.
- Connectors: Rear or front-panel terminal blocks for easy field wiring.
- Enclosure: Standard UR module form factor with protective conformal coating.
Working Principle: The URSHA receives digital data packets from the UR CPU over the internal backplane. An onboard microcontroller or FPGA extracts the requested variables and passes them to high-precision DACs. The resulting analog voltage is converted to a current loop (4-20 mA) via operational amplifiers and isolation transformers before being sent to the external field wiring.
Installation Requirements:
- Slot Selection: Install in an available analog expansion slot on the UR relay chassis.
- Wiring: Use shielded twisted-pair cables for analog outputs to prevent electromagnetic interference.
- Grounding: Ensure proper grounding of the shield at the control panel end to prevent ground loops.
Usage Precautions:
- Loop Power: Verify whether the module provides loop power or requires an external power supply for the 4-20 mA receivers.
- Scaling Verification: Always verify the analog output accuracy using a precision multimeter after configuration changes.
- Open Circuit Protection: Avoid leaving analog output terminals open while powered to prevent internal amplifier damage.
