Schneider LRD16
SCHNEIDER ELECTRIC LRD16 Overload Relay User Manual
Model: LRD16
Brand: Schneider Electric
Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of the Schneider Electric LRD16 Overload Relay. The LRD16 is a TeSys D Class 10 thermal overload relay designed to protect AC circuits and motors against overloads, phase failure, and long starting times. It features single-phase sensitivity and an adjustable trip current range.
Setup and Installation
Before beginning installation, ensure that the power supply to the circuit is disconnected and locked out to prevent accidental energization. Installation should only be performed by qualified personnel.
Mounting
The LRD16 overload relay is designed for direct mounting onto TeSys D contactors. Ensure proper alignment of the relay's terminals with the contactor's power terminals.
Figure 1: LRD16 Overload Relay mounted on a contactor. This image shows the front view of the LRD16 relay connected to a larger contactor unit, illustrating the typical installed configuration.
Alternatively, the relay can be mounted separately using a terminal block adapter (LAD7B106, as seen on the top unit in Figure 1) or a DIN rail mounting kit, if required for specific applications.
Figure 2: Bottom view of the LRD16 Overload Relay. This image highlights the base of the relay, showing the slots and holes designed for secure mounting to compatible contactors or adapters.
Wiring
Connect the main power circuit through the LRD16 relay's power terminals (1L1, 3L2, 5L3 for input and 2T1, 4T2, 6T3 for output, typically via the contactor). The control circuit connections (95-96 NC, 97-98 NO) are used for signaling and tripping the contactor coil.
Figure 3: Top view of the LRD16 Overload Relay. This image displays the top terminals (1L1, 3L2, 5L3) where the incoming power lines are connected, providing a clear view for wiring.
Ensure all connections are secure and tightened to the specified torque to prevent loose connections and potential hazards.
Operating Instructions
Setting the Trip Current
The LRD16 has an adjustable trip current range of 9A to 13A. Use a flat-head screwdriver to rotate the dial on the front of the relay to set the desired full-load current of the motor being protected. Set the dial to the motor's rated current.
Figure 4: Close-up of the LRD16 adjustment dial and control buttons. This image provides a detailed view of the current setting dial (ranging from 9 to 13 amps) and the blue 'RESET' and red 'STOP' buttons.
Resetting the Relay
In the event of an overload, the relay will trip, opening the control circuit and stopping the motor. To reset the relay after it has tripped, press the blue 'RESET' button on the front of the unit. Ensure the cause of the overload has been identified and resolved before resetting and restarting the motor.
Stop Function
The red 'STOP' button can be used to manually trip the relay, which will open the control circuit and stop the motor. This can be used for testing or emergency shutdown purposes.
Operating Mode
The LRD16 operates in automatic mode. Once the overload condition is cleared and the relay is reset, it is ready for operation.
Maintenance
The LRD16 overload relay is designed for minimal maintenance. Regular inspection is recommended to ensure optimal performance and safety.
- Visual Inspection: Periodically check the relay for any signs of physical damage, discoloration, or loose connections.
- Cleaning: Keep the relay free from dust and debris. Use a dry, soft cloth for cleaning. Do not use solvents or abrasive cleaners.
- Connection Check: Ensure all wiring connections remain tight and secure.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Relay trips frequently | Motor overload, incorrect current setting, phase imbalance, motor fault. | Verify motor load, adjust current setting to motor FLA, check motor for faults, inspect power supply for phase issues. |
| Relay does not reset | Overload condition still present, relay damaged. | Ensure overload condition is resolved and allow relay to cool. If issue persists, replace relay. |
| Motor does not start after reset | Control circuit issue, contactor fault. | Check control circuit wiring and contactor operation. |
Specifications
The following specifications apply to the Schneider Electric LRD16 Overload Relay:
Figure 5: Side view of the LRD16 Overload Relay showing the product label. This image displays detailed technical specifications, including voltage ratings, current ranges, and compliance standards.
- Model Number: LRD16
- Product Dimensions: 3.5 x 3.25 x 1.75 inches; 4.8 ounces
- Current Rating: 9A to 13A (Adjustable)
- Maximum Switching Current: 13 Amps
- Contact Type: Normally Open (NO) and Normally Closed (NC) auxiliary contacts (97-98 NO, 95-96 NC)
- Operation Mode: Automatic
- Class: 10
- Manufacturer: SCHNEIDER
- National Stock Number: 5945-01-485-5043
Warranty and Support
Warranty Information
Schneider Electric products are manufactured to high quality standards. For specific warranty terms and conditions applicable to the LRD16 Overload Relay, please refer to the official Schneider Electric warranty documentation or contact their customer support.
Customer Support
For technical assistance, product inquiries, or support, please visit the official Schneider Electric website or contact their customer service department. You can find contact information and additional resources on their website.
For more information, you may visit the Schneider Electric Store on Amazon.
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