Key Technical Specifications
- Product Model: UR6CH
Digital I/O module for UR series universal relays. - Manufacturer: GE Multilin
Original equipment for UR series protection and control relays. - Module Type: Digital Input/Output Module
Provides discrete I/O for auxiliary equipment communication. - Output Configuration: 8 Form C (SPDT) Contacts
Each output has a common point, normally open (NO), and normally closed (NC). - Contact Type: Single Pole Double Throw (SPDT)
Allows switching between two output states per channel. - Input Channels: Digital Inputs (verify specific count per datasheet)
Receives discrete signals from field devices. - Installation: Plug-in Module for UR Relay Chassis
Accessible via hinged front panel for easy replacement. - Design: Compact and Rugged
Engineered to withstand harsh industrial substation environments. - Configuration: Software-configurable via UR relay interface
Assign functions to individual I/O points through relay settings. - Application: Substation Automation, Generator Protection
Interfaces with SCADA, annunciators, and control circuits.
Product Introduction
GE UR6CH is an 8-channel digital I/O module designed for the GE Multilin UR series universal relays. It provides discrete input and output capability, enabling the relay to communicate with auxiliary equipment such as annunciators, SCADA systems, and external control circuits.This module’s defining feature is its 8 Form C (SPDT) relay outputs, each offering a common terminal with both normally open and normally closed contacts. This switching capability allows flexible wiring for alarm, trip, or status indication without requiring external interposing relays. (I’ve seen integrators wire the NC contact for fail-safe alarm circuits and the NO for active trip signals on the same module—clean design when planned correctly.)
Installation & Configuration Guide
Preparation (10 min)
Verify the UR relay chassis has an available module slot. Review the relay’s I/O assignment table to confirm which channels are allocated for your application. Have the relay configuration software (e.g., EnerVista UR Setup) ready. Ensure the relay is in maintenance mode or isolated before proceeding.Removal (5–10 min)
Open the hinged front panel to access the module bay. Loosen the captive screws securing the UR6CH. Pull the module straight out of the backplane connector—do not twist or rock it. Inspect the backplane pins for corrosion or damage. Note the module’s position in the chassis for reinstallation.Installation (10 min)
Align the UR6CH with the backplane connector and slide it in firmly until fully seated. Tighten the captive screws to secure the module. Connect field wiring to the terminal block per the relay’s I/O diagram; verify NO/NC/Common assignments for each Form C output. Double-check that no wires are pinched or stripped.Power-On & Test (10 min)
Restore power to the UR relay. Verify the relay recognizes the UR6CH module (check the I/O module status in the relay display or setup software). Force individual outputs to verify relay actuation and field circuit response. Test digital inputs by simulating field signals. Confirm all 8 channels operate correctly before returning the relay to service.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Immediate Check |
|---|---|---|
| Module Not Recognized | Backplane connection issue | Reseat module; inspect backplane pins for damage. |
| Output Not Energizing | Wrong I/O assignment or wiring | Verify relay configuration; check NO/NC/Common wiring. |
| Relay Clicks But No Field Voltage | Open field circuit or blown fuse | Measure voltage at relay contacts; check field-side protection. |
| Intermittent Output | Loose terminal or vibration | Torque terminal screws; inspect for vibration-induced loosening. |
| Input Not Detected | Wiring or signal polarity | Verify input voltage at module terminal; check wiring diagram. |
| All Outputs Stuck On | Configuration error or short | Review I/O logic; check for field-side short to common. |
Dimensions, Mounting & Wiring Notes
- Form Factor: Plug-in module for UR relay chassis
- Mounting: Internal module bay; accessible via hinged front panel
- Wiring: Field connections via screw terminals on module faceplate; verify Form C common terminal assignment
- Weight: Approximately 2.55 lbs (1.16 kg)
- Terminal Torque: Follow GE UR relay installation manual for specified torque values
- Clearance: Maintain minimum clearance per UR relay chassis specifications for airflow and wire bend radius
FAQ
What does “Form C” actually mean for wiring?
Form C is a Single Pole Double Throw (SPDT) contact. Each of the 8 outputs has three terminals: Common (C), Normally Open (NO), and Normally Closed (NC). When the relay is de-energized, C connects to NC; when energized, C switches to NO. This lets you wire both alarm and trip functions from one output channel.Can I hot-swap the UR6CH module?
No. The UR relay must be de-energized before removing or installing I/O modules. The backplane is not hot-swappable. Plan for a maintenance window.How do I know which I/O channels are assigned?
Use the EnerVista UR Setup software or the relay’s front-panel HMI to view the I/O assignment table. Each channel can be configured for specific functions (alarm, trip, status). Document your assignments before making changes.I’m seeing a “Module Missing” alarm, what now?
First, reseat the module—pull it out and push it back in firmly. If the alarm persists, check the backplane connector for bent or corroded pins. Try the module in a different slot to isolate whether it’s a module or backplane issue.Can I use this module for direct trip circuits?
Yes, but verify the contact rating. Form C relay contacts on the UR6CH are suitable for many trip applications, but always check the datasheet for interrupting capacity and DC voltage ratings. For high-energy trip coils, consider adding an external interposing relay.Are there different versions of the UR6CH?
The UR6CH designation is consistent, but always verify the revision level on the module label. Check compatibility with your specific UR relay model (e.g., UR6, UR8) in the GE Multilin documentation. Some older revisions may have different terminal layouts.Do I need special tools for installation?
A standard Phillips screwdriver for the captive screws and a small flat-blade screwdriver for the field terminals are sufficient. No proprietary tools are required. Keep a torque driver handy to avoid over-tightening terminals.
