1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of the Schneider Electric Zelio SR2B121B Logic Relay. Please read this manual thoroughly before attempting to install or operate the device.
2. Safety Information
Warning: Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.
- Always disconnect power before working on the device or its connections.
- Ensure proper grounding to prevent electrical shock.
- Adhere to all local and national electrical codes.
- Do not operate the device in environments exceeding its specified temperature or humidity ratings.
3. Product Overview
The Zelio SR2B121B is a compact logic relay designed for simple automation applications. It features a built-in display for programming and monitoring, along with multiple inputs and relay outputs.
Figure 1: Schneider Electric Zelio SR2B121B Logic Relay. This image displays the Schneider Electric Zelio SR2B121B logic relay. It features a green backlit LCD screen showing a programming sequence (I1-I2+I3+I4-I5-CC1, Z1, Z2-C1-I1, Z3). Above the screen are screw terminals for 24VDC power (+, -) and inputs I1-I4 (24VDC) and IB-IE (Analog or 24VDC). Below the screen are four gray navigation buttons and a green 'Menu/Ok' button. The bottom section shows output terminals Q1-Q4, labeled as Relay 8A.
3.1. Components
- Display: Integrated LCD for programming, status monitoring, and diagnostics.
- Navigation Buttons: Used to navigate menus and adjust parameters.
- Menu/Ok Button: Confirms selections and enters menus.
- Inputs (I1-I4, IB-IE): Terminals for connecting sensors and control signals. I1-I4 are 24VDC digital inputs. IB-IE can be configured as analog or 24VDC digital inputs.
- Outputs (Q1-Q4): Relay outputs for controlling external devices, rated at 8A.
- Power Supply Terminals: For 24VDC power input.
4. Setup
4.1. Mounting
The Zelio SR2B121B is designed for DIN rail mounting. Ensure the DIN rail is securely fastened in a suitable enclosure, providing adequate ventilation and protection from environmental factors.
- Hook the top edge of the relay onto the DIN rail.
- Press the bottom edge of the relay firmly until it clicks into place on the DIN rail.
4.2. Wiring
All wiring should be performed with the power supply disconnected. Use appropriate wire gauges for all connections.
- Power Supply: Connect the 24VDC power supply to the designated '+' and '-' terminals. Observe polarity.
- Inputs: Connect sensors or control switches to the I1-I4 and IB-IE terminals as per your application's logic. Refer to the programming section for input configuration.
- Outputs: Connect the loads (e.g., contactors, indicator lights) to the Q1-Q4 relay output terminals. Ensure the load current does not exceed the 8A rating per output.
5. Operating
5.1. Initial Power-Up
Once wiring is complete and verified, apply 24VDC power. The display will illuminate, and the device will initiate its startup sequence.
5.2. Display Navigation
Use the navigation buttons (up, down, left, right arrows) to scroll through menus and parameters on the LCD. The 'Menu/Ok' button is used to enter sub-menus or confirm selections.
5.3. Programming
The Zelio SR2B121B can be programmed directly via its front panel display. The programming interface allows for the creation of logic functions using a ladder diagram or function block diagram approach. Consult the detailed programming guide available from Schneider Electric for comprehensive instructions on creating and uploading programs.
- Press the 'Menu/Ok' button to access the main menu.
- Navigate to the 'Program' or 'Edit' section.
- Use the arrow buttons to select inputs, outputs, timers, counters, and other function blocks.
- Confirm each step with the 'Menu/Ok' button.
- After programming, save and transfer the program to run mode.
5.4. Monitoring
The display can show the real-time status of inputs, outputs, and internal variables. Navigate to the 'Monitor' or 'Status' menu to view these values.
6. Maintenance
The Zelio SR2B121B is designed for minimal maintenance. Regular inspections are recommended to ensure optimal performance.
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use abrasive cleaners or solvents.
- Connections: Periodically check all wiring connections for tightness and signs of corrosion.
- Environment: Ensure the operating environment remains within specified temperature and humidity limits.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on | No power supply; Incorrect wiring; Blown fuse | Check 24VDC power source; Verify wiring polarity; Check external fuse. |
| Inputs not responding | Incorrect wiring; Sensor fault; Program logic error | Verify input wiring; Test sensor functionality; Review program logic. |
| Outputs not activating | Incorrect wiring; Load fault; Program logic error | Verify output wiring; Test load device; Review program logic. |
| Display shows error code | Internal fault; Programming error | Note the error code and consult the detailed Zelio SR2 manual or Schneider Electric support. |
8. Specifications
- Model: SR2B121B
- Brand: Schneider Electric
- Power Supply: 24VDC
- Inputs: 12 I/O (I1-I4 24VDC, IB-IE Analog or 24VDC)
- Outputs: 4 Relay Outputs (Q1-Q4), 8A per relay
- Display: Integrated LCD
- Dimensions: Approximately 3.9 x 2.6 x 3.6 inches (100 x 66 x 91 mm)
- Weight: Approximately 8.5 ounces (0.24 kg)
- Material: Copper (internal components)
- Installation Type: Screw-In (terminals), DIN rail mount
- UPC: 785901571834
9. Warranty and Support
Schneider Electric products are manufactured to high-quality standards. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official Schneider Electric website. For technical assistance, product support, or service inquiries, please contact Schneider Electric customer support through their official channels.
