1. Introducció
This manual provides essential information for the safe and effective installation, operation, and maintenance of the Schneider Electric LRD313 Thermal Overload Relay. Please read this manual thoroughly before attempting any installation or operation to ensure proper function and prevent potential hazards.
The LRD313 is a 9-13A Class 10 thermal overload relay designed to protect AC circuits and motors against overloads, phase failure, and prolonged starting times. It features Everlink Power Terminals for reliable connections.
2. Producte acabatview
The Schneider Electric LRD313 is a robust thermal overload relay. Key components include:
- Main Power Terminals (1L1, 3L2, 5L3): For incoming power connections.
- Load Terminals (2T1, 4T2, 6T3): For outgoing connections to the motor or load.
- Control Contacts (97 NO, 98 NO, 95 NC, 96 NC): Auxiliary contacts for control circuits, indicating overload status.
- RESET Button (Blue): Used to manually reset the relay after an overload trip.
- Botó STOP (vermell): Used to manually trip the relay or stop the protected circuit.
- Current Adjustment Dial (LRD): Allows setting the nominal current for overload protection.
Figura 1: Davant view of the Schneider Electric LRD313 Thermal Overload Relay. Visible components include the main power terminals (1L1, 3L2, 5L3), load terminals (2T1, 4T2, 6T3), control contacts (97 NO, 98 NO, 95 NC, 96 NC), the blue RESET button, the red STOP button, and the current adjustment dial labeled 'LRD'.
3. Informació de seguretat
WARNING: Risk of electric shock or arc flash. Only qualified personnel should install, operate, or service this equipment. Failure to follow these instructions can result in death or serious injury.
- Always disconnect power before working on the relay or associated equipment.
- Utilitzar equips de protecció individual (EPI) adequats.
- Assegureu-vos que totes les connexions estiguin ben ajustades i segures per evitar el sobreescalfament i els arcs elèctrics.
- Verify the relay's current rating matches the motor or load requirements.
- Do not bypass or modify safety devices.
4. Instal·lació (Configuració)
The LRD313 thermal overload relay is designed for direct mounting to TeSys D contactors or stand-alone mounting using an adapter block (not included).
- Desconnexió d'alimentació: Ensure all power to the circuit is disconnected and locked out according to safety procedures.
- Muntatge:
- Muntatge directe: Align the LRD313 with the corresponding TeSys D contactor terminals. Push firmly until it clicks into place.
- Stand-alone Mounting: If using an adapter block, mount the adapter block to a DIN rail or panel, then attach the LRD313 to the adapter block.
- Wiring Main Power Circuit:
- Connect the incoming power lines to the LRD313's 1L1, 3L2, 5L3 terminals.
- Connect the motor or load lines to the LRD313's 2T1, 4T2, 6T3 terminals.
- Utilize the Everlink Power Terminals for secure and reliable connections. Ensure proper torque is applied to all terminal screws.
- Wiring Control Circuit:
- Integrate the 95 NC (Normalment Tancat) i 96 NC (Normalment Tancat) contacts into the contactor coil control circuit. These contacts will open upon an overload trip, de-energizing the contactor.
- El 97 NO (Normalment obert) i 98 NO (Normalment obert) contacts can be used for alarm or indication circuits, closing upon an overload trip.
- Configuració actual: Adjust the current setting dial (labeled 'LRD') to match the full load current (FLA) of the protected motor or load. Refer to the motor's nameplate for the correct FLA value.
- Verificació: Comproveu dues vegades que tot el cablejat sigui correcte i estan ben ajustat.
5. Funcionament
Once installed and properly configured, the LRD313 operates automatically to protect the circuit.
- Funcionament normal: During normal operation, the relay allows current to flow to the motor. The NC contacts (95-96) remain closed, and the NO contacts (97-98) remain open.
- Overload Trip: If an overload condition occurs (current exceeds the set value for a prolonged period), the thermal elements in the relay will heat up and trip the mechanism. This opens the NC contacts (95-96), stopping the motor, and closes the NO contacts (97-98), activating any connected alarm.
- Resetting the Relay: After an overload trip, allow the relay to cool down for a few minutes. Then, press the blue RESET button to reset the relay. If the overload condition persists, the relay will trip again. Investigate and resolve the cause of the overload before attempting to reset repeatedly.
- Manual Stop/Trip: El vermell STOP button can be pressed to manually trip the relay, opening the main circuit and stopping the motor. This can be used for testing or emergency shutdown.
6. Manteniment
The LRD313 thermal overload relay is designed for minimal maintenance. However, periodic checks are recommended:
- Inspecció visual: Inspeccioneu regularment el relé per detectar qualsevol signe de danys físics, decoloració o connexions soltes.
- Estanquitat del terminal: Periodically check the tightness of all terminal screws, especially in environments with vibration.
- Neteja: Keep the relay free from dust, dirt, and moisture. Use a dry, lint-free cloth for cleaning.
- Prova de funcionalitat: Periodically test the trip and reset functions using the manual STOP button and then the RESET button.
7. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| Relay trips frequently. | Sobrecàrrega del motor, configuració incorrecta del corrent, desequilibri de fase, avaria del motor. | Check motor load, verify current setting matches motor FLA, inspect motor for faults, check power supply for phase imbalance. |
| Relay does not reset. | Relay still hot after trip, mechanical issue, persistent overload. | Allow sufficient cooling time. If issue persists, check for mechanical damage or a continuous overload condition. |
| El motor no arrenca. | Relay tripped, control circuit wiring error, contactor fault. | Check if relay is tripped and reset if necessary. Verify control circuit wiring, check contactor operation. |
| Relay appears damaged. | Physical impact, excessive heat, electrical fault. | Disconnect power immediately. Replace the relay. Investigate cause of damage. |
8. Especificacions
- Número de model: LRD313
- Interval actual: 9-13A
- Classe tèrmica: Classe 10
- Fabricant: SCHNEIDER ELECTRIC
- Tipus de connexió: Everlink Power Terminals
- Contactes auxiliars: 1 NO + 1 NO
- Tipus de restabliment: Manual/Automatic (depending on configuration, LRD series typically manual)
- Dimensions del paquet: 1 x 1 x 1 polzades (aproximadament)
- Pes de l'article: 15.04 unces (aproximadament)
9. Garantia i Suport
Specific warranty details for the Schneider Electric LRD313 are typically provided at the point of purchase or can be found on the official Schneider Electric weblloc web. Si us plau, conserveu el comprovant de compra per a reclamacions de garantia.
For technical support, product inquiries, or service, please contact Schneider Electric directly or visit their official website. You may also find additional resources on the Botiga Schneider Electric a Amazon.
