Voltage Control Relay DGK-04PF
Regarding the technical parameters and application information of the **Voltage Control Relay DGK-04PF**, combined with existing resources and industry knowledge, the following is a detailed description:
I. Core Functions and Technical Parameters
1. **Basic Functions**
- **Voltage Monitoring**: Monitor the circuit voltage in real-time, supporting overvoltage (OVP), undervoltage (UVP), phase loss, and phase sequence protection.
- **Output Control**: When the voltage is abnormal, cut off the load circuit through the relay contacts (normally open/normally closed) to protect the safety of the equipment.
- **Adjustment Range**:
- **Overvoltage Threshold**: 400V~460V AC (adjustable)
- **Undervoltage Threshold**: 170V~230V AC (adjustable)
- **Response Time**: ≤100ms (Quickly cut off the abnormal voltage).
2. **Electrical Parameters**
- **Rated Voltage**: AC 220V (±10%), supporting wide voltage input (180V~250V AC).
- **Contact Capacity**:
- Main Contact: 10A @ 250V AC (Resistive Load)
- Auxiliary Contact: 5A @ 250V AC
- **Coil Power Consumption**: ≤5W (Low power consumption design).
3. **Physical Characteristics**
- **Installation Method**: 35mm rail installation (DIN standard), supporting panel-mounted or embedded installation.
- **Protection Level**: IP20 (Dust-proof design, suitable for industrial environments).
II. Application Scenarios and Supporting Solutions
1. **Typical Applications**
- **Motor Protection**: Prevent the motor from being damaged due to voltage fluctuations (such as stalling caused by undervoltage and insulation breakdown caused by overvoltage).
- **Front-end Protection of Frequency Inverter**: Monitor the input voltage of the frequency inverter to avoid damage to the frequency conversion module caused by abnormal voltage.
- **Photovoltaic Inverter**: Cut off the output of the inverter when the grid voltage is abnormal to protect the equipment and personnel safety.
- **Building Electrical System**: Used for voltage monitoring of equipment such as distribution boxes, elevators, and air conditioners.
2. **Recommended Supporting Equipment**
- **Contactor**: CHINT CJX2 series (such as CJX2-1810), used for the on-off control of the load circuit.
- **Circuit Breaker**: CHINT NXB series (such as NXB-63), providing short-circuit and overload protection.
- **Current Transformer**: Cooperate with the relay to achieve three-phase current monitoring (such as LMK-0.66 series).
III. Installation and Wiring Guide
1. **Wiring Schematic Diagram**
- **Note**:
- The voltage input wire should use copper core wire above 1.5mm² to ensure signal stability.
- The output contacts should match the load current to avoid overload.
2. **Parameter Setting Steps**
1. **Threshold Setting**: Adjust the overvoltage/undervoltage threshold through the panel knob (for example, set the overvoltage to 420V and the undervoltage to 190V).
2. **Delay Setting**: A delay action of 0~5s can be set to avoid false triggering due to instantaneous voltage fluctuations.
3. **Reset Mode**: Support automatic reset (automatically close after the voltage recovers) or manual reset (need to press the reset button).
IV. Troubleshooting and Maintenance
1. **Common Problems and Solutions**
| Fault Phenomenon | Possible Causes | Solutions |
| The relay does not act | The power supply is not connected or the voltage is too low | Check the power connection and confirm that the input voltage is normal |
| Contact Adhesion | The load current is too large or the contacts are burned | Replace the contact module and check the load current |
| False Triggering of Protection | The threshold setting is improper or the voltage fluctuates frequently | Recalibrate the threshold and increase the delay time |
2. **Maintenance Suggestions**
- **Regular Cleaning**: Clean the dust on the surface of the relay every quarter to avoid affecting heat dissipation.
- **Contact Inspection**: Check the wear of the contacts every six months and replace them if necessary.
- **Parameter Verification**: Verify the voltage monitoring accuracy with a multimeter every year.
V. Procurement and Delivery Information
1. **Supplier Channels**
- **Authorized Dealers of CHINT**: You can query local dealers through the official website of CHINT , or contact the customer service at 400-887-3288.
- **Third-party Platforms**: Search for "CHINT DGK-04PF" on e-commerce platforms such as JD.com and Tmall.com, and choose stores with high credibility.
2. **Quotation and Delivery**
- **Price Range**: RMB 200~300 per unit (Discounts are available for bulk purchases).
- **Delivery Cycle**: In-stock orders will be shipped within 1~3 working days, and customized requirements will take 7~15 working days.
VI. Alternative Selection Solutions
If the DGK-04PF is out of stock or the parameters do not match, you can consider the following alternative models:
- **CHINT XJ3-G**: Phase Loss and Phase Sequence Protection Relay, supporting voltage monitoring (Reference price: RMB 150 per unit).
- **OMRON G3NA-220B**: Universal Voltage Relay with higher accuracy (Reference price: RMB 400 per unit).
VII. Precautions
1. **Safe Operation**
- Disconnect the power supply before installation to avoid the risk of electric shock.
- Ensure that the neutral wire and the live wire are correctly connected during wiring to prevent short circuits.
2. **Environmental Requirements**
- Operating Temperature: -25°C~+55°C (Avoid high-temperature or humid environments).
- Storage Temperature: -40°C~+70°C (Needs to be stored dry).
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