1. Introduction
The JUCMJXQEQ EOCR-SSD is a digital electronic overload relay designed to protect motors from various electrical faults. It provides reliable protection against overload, phase loss, and locked rotor conditions, ensuring the longevity and safe operation of industrial electromotors. This manual provides essential information for the proper installation, operation, and maintenance of your EOCR-SSD unit.
2. Key Features
- Compact Design: Space-saving form factor for various installations.
- Comprehensive Protection: Includes overload, phase loss, and locked rotor protection.
- Accurate Current Display: Front panel LED display shows the working current (highest current of L1 and L3).
- Trip Cause Indication: LED window displays the cause of a trip for quick diagnosis.
- Phase Loss Protection: Activates within 3 seconds of detecting phase loss.
- Flexible Application: Selective use for single-phase (1P) and three-phase (3P) systems via DIP switch.
- Optional Contact Output: Features fail-safe (N) or non-fail-safe (R) contact output for simplified adjustment.
- Easy Installation: Supports both Din Rail and Panel Mounting methods.
3. Product Overview
The EOCR-SSD series offers various current ranges to suit different motor protection needs. Below are examples of different models within the series, showcasing their appearance and current ratings.
4. Installation
The EOCR-SSD is designed for flexible installation, supporting both Din Rail and Panel Mounting. Ensure all power is disconnected before beginning installation.
4.1 Mounting
- Din Rail Mounting: Snap the unit onto a standard 35mm Din Rail. Ensure it is securely fastened.
- Panel Mounting: Use appropriate screws and mounting holes to secure the unit to a panel. Refer to the product's physical dimensions for precise hole placement.
4.2 Connection Diagrams
Refer to the connection diagrams provided with your specific EOCR-SSD unit for detailed wiring instructions. Ensure all connections are made according to local electrical codes and safety standards. The unit typically requires connections for the main power circuit (L1, L2, L3 for three-phase, or L1, L2 for single-phase) and control circuit (A1, A2) for auxiliary power, as well as output contacts (95, 96, 97, 98) for control.
5. Operation and Settings
After installation, configure the EOCR-SSD using the front panel knobs to match your motor's specifications.
5.1 Setting Knobs
- D-TIME (Delay Time): Set this knob to two to three seconds longer than the motor's normal starting time. This prevents nuisance tripping during motor startup.
- O-TIME (Over-current Run Time): Set this knob to a value less than the motor's endurance time under over-current conditions. This determines how long an over-current condition must persist before the relay trips.
- LOAD (Rated Current): Set this knob to over 110% of the motor's rated current or under 120% of its operating current. This establishes the overload trip threshold.
5.2 DIP Switch for Phase Selection
A DIP switch allows selection between single-phase (1P) and three-phase (3P) operation. Ensure this is set correctly for your application.
5.3 Asymmetry Set
The asymmetry setting is typically fixed at ±5% to detect phase imbalance. Refer to the specific model's documentation for any adjustable asymmetry settings.
5.4 Trip Cause Indication
When a trip occurs, the LED window on the front panel will display the cause, aiding in quick troubleshooting. Common indications include Over-Current, Phase Loss, or Locked Rotor.
6. Protection Functions
The EOCR-SSD provides robust protection for your motor:
- Over-Current Protection: Trips when the current exceeds the set LOAD value for the duration of O-TIME.
- Phase Loss Protection: Detects the loss of a phase and trips within 3 seconds to prevent motor damage.
- Locked Rotor Protection: Trips if the operating current exceeds 200% of the set current after the D-TIME has elapsed, indicating a locked rotor condition.
7. Specifications
| Parameter | Description |
|---|---|
| Current Range | Type05: 0.5-6A Type30: 3-30A Type60: 5-60A Type120: 10-120A Type600: Use external CT (secondary 5A) over 120A with 05 type. |
| Operating Voltage (Un) | Type110: 90-130VAC Type220: 180-260VAC Type380: 300-440VAC |
| Operating Frequency | 50/60Hz |
| Power Consumption | <2W |
| Operating Temperature | -20°C to +55°C |
| Waiting (t) | D-Time: 1-30s O-Time: 1-10s |
| Asymmetry Set | Approximately ±5% |
| Contact Rating | 5A 250VAC Resistive Load |
| Connection Type | 35mm Din Rail (D) or Panel (P) |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches |
| Item Weight | 1.76 ounces |
| ASIN | B0D119RZC1 |
| Item Model Number | JUCMJXQEQ |
8. Maintenance
The EOCR-SSD is designed for minimal maintenance. Regular inspection is recommended to ensure optimal performance.
- Visual Inspection: Periodically check the unit for any signs of physical damage, discoloration, or loose connections.
- Cleaning: Keep the unit clean and free from dust and debris. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Connection Check: Ensure all wiring connections remain tight and secure.
9. Troubleshooting
If the EOCR-SSD trips, refer to the LED display for the indicated cause. This will help in diagnosing the issue.
- Over-Current Trip: Check the motor load, ensure it is not exceeding its rated capacity. Verify the LOAD setting on the EOCR-SSD is appropriate. Inspect for mechanical issues in the motor or driven equipment.
- Phase Loss Trip: Check the power supply for missing phases. Inspect wiring connections for breaks or loose terminals.
- Locked Rotor Trip: This indicates the motor is drawing excessive current without rotating. Check for mechanical obstructions, bearing issues, or a seized motor.
- Unit Not Powering On: Verify the control voltage (A1, A2) is correctly applied and within the specified operating voltage range.
- Nuisance Tripping: If the unit trips during motor startup, increase the D-TIME setting slightly. Ensure the LOAD setting is not too sensitive.
If issues persist, consult a qualified electrician or contact technical support.
10. Compliance and Certifications
The EOCR-SSD is designed and manufactured to meet relevant industry standards. A certificate of compliance is available, detailing the product's adherence to various regulations.
11. Warranty and Support
Warranty information for the JUCMJXQEQ EOCR-SSD Digital Electronic Overload Relay Motor Protector is typically provided at the point of purchase or can be obtained directly from the manufacturer or authorized seller. Please retain your proof of purchase for warranty claims.
For technical support, installation assistance, or troubleshooting beyond the scope of this manual, please contact your product supplier or the manufacturer's customer service department.