The General Electric UR 67H, also cataloged as the 67H Digital I/O module, operates as a dedicated hardware component for discrete signal interfacing and switching execution within Multilin Universal Relay (UR) platforms. Configured for horizontal rack mounting, this module manages the acquisition of external switch/sensor inputs and provides 8 Form A (SPST) relay outputs for control logic implementation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | UR 67H |
| Brand | General Electric |
| Origin | USA |
| Weight | 0.70 kg |
| Dimensions | Standard UR horizontal unit |
| Operating Temp | -20 deg C to +60 deg C |
| Power Consumption | Dependent on relay coil activation |
| Inputs | Digital inputs for discrete signals |
| Outputs | 8 Form A (SPST) relay outputs |
| Operating Voltage | 24 VDC |
| Mounting Style | Horizontal rack mount |
Backplane Bus Communication and Firmware Compatibility
The UR 67H communicates via the relay backplane bus to ensure synchronization between field status inputs and the centralized processing unit. The deterministic nature of the UR backplane architecture supports high-speed signal processing, which is necessary for protection coordination. Firmware flash compatibility is governed by the host relay chassis revision; users must ensure the system software is capable of addressing the 67H module's specific I/O mapping to prevent initialization errors or bus communication failures.
Frequently Asked Questions
Q: Are the 8 Form A relay outputs suitable for high-current loads?
A: No. The Form A (SPST) relays are designed for low-voltage signal switching. Connecting inductive loads or currents exceeding the specific relay rating can lead to contact welding or accelerated degradation of the output hardware.
Q: Is this module compatible with hot-swapping procedures?
A: No. The UR 67H module is not designed for insertion or extraction while the Multilin relay chassis is energized. Always isolate power to the unit before performing maintenance or module replacement.
Field Installation Guidelines
- Ensure the Multilin UR chassis is de-energized and that the rack power supply is isolated.
- Verify the horizontal slot alignment to prevent pin misalignment with the backplane connector.
- Slide the module into the chassis until the rear connectors are firmly seated.
- Secure the module using the provided mechanical fastening points on the front panel.
- Connect field wiring to the I/O terminals, ensuring correct signal polarity for the 24 VDC input circuits.
- Verify output relay contact functionality and input detection status through the relay's front-panel diagnostic menu after system power-up.
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