1. Product Overview
The Finglai BK series control transformers are designed for industrial and mining applications, as well as for general electrical equipment. They are manufactured using high-strength enameled wire and high-quality silicon steel laminations, featuring a shell-type iron core formed by stacking silicon steel sheets.
These transformers are suitable for use in AC circuits with a frequency of 50 Hz to 60 Hz and a voltage up to 500 V. They are capable of continuous, long-term operation under rated load conditions.
The primary and secondary windings are electrically isolated. When the secondary side has multiple windings for different purposes (control, lighting, indicator lamps), these windings are wound individually according to their capacity allocations. For single-winding transformers with intermediate taps, the capacity of each tap is lower than the total rated capacity; only the terminal corresponding to the maximum voltage output can handle the full rated capacity.
Product Insulation Class: Class B.
2. Specifications
2.1 General Specifications
| Feature | Description |
|---|---|
| Model Number | BK-200VA-MV |
| Rated Capacity | 200VA |
| Input Voltage | AC 220V or 380V |
| Output Voltage Options | 6.3V, 12V, 24V, 36V, 110V, 220V (specific combinations vary by model variant) |
| Frequency | 50/60Hz |
| Coil Structure | Toroidal |
| Coil Number | Autotransformer |
| Phase | SINGLE |
| Insulation Resistance | ≥20MΩ |
| Efficiency | ≥80% |
| Certification | CE |
| Origin | Mainland China |
| Use | Power |
2.2 Environmental Conditions
This transformer is designed to operate under the following environmental conditions:
- Altitude: Not exceeding 2,500 meters.
- Ambient Temperature: Shall not exceed +40°C nor fall below -25°C. The 24-hour average temperature should not exceed 35°C. At higher altitudes, the maximum ambient temperature must adhere to the following limits:
Altitude (h) Maximum Medium Temperature h ≤ 1000m +40°C 1000m < h < 1500m +37.5°C 1500m < h ≤ 2000m +35°C 2000m < h ≤ 2500m +32.5°C - Relative Humidity: Shall not exceed 85%, provided that the average minimum temperature for the corresponding month does not exceed +25°C, and accounting for potential condensation due to temperature fluctuations.
- Installation Site: Must be protected from rain and snow.
- Location: Must be free from severe shaking or impact vibrations.
- Medium: Must be free from explosion hazards, and the medium must not contain gases or dust (including conductive dust) capable of corroding metals or damaging insulation.
3. Safety Precautions
Please read and understand these precautions before installation and operation to ensure safe use and prevent damage to the transformer or connected equipment.
- Voltage Verification: Before use, verify that the operating voltage matches the product specifications. The input and output terminals must not be connected in reverse.
- Load Capacity: The connected load must be less than or equal to the rated capacity indicated on the product's nameplate. Do not operate under overload conditions.
- Wiring Security: Check all wiring terminals to ensure they are securely fastened and not loose. Loose connections can cause overheating and electrical hazards.
- Grounding: Grounding of the product's secondary wiring is strictly prohibited.
4. Installation and Setup
The BK-200VA transformer is designed for easy mounting and wiring. Refer to the images below for physical orientation and terminal identification.
4.1 Mounting
The transformer features mounting brackets at its base. Secure the transformer to a stable, flat surface using appropriate fasteners through the mounting holes. Ensure the installation site meets the environmental conditions specified in Section 2.2.
4.2 Wiring Connections
The transformer is equipped with clearly labeled terminal blocks for input and output connections. Refer to Figure 2 for terminal identification.
- Input Terminals:
- For 220V input, connect to terminals 1 and 2.
- For 380V input, connect to terminals 1 and 3.
- Output Terminals: The output terminals provide various voltage options. Connect your load to the desired output terminals:
- 12V output: Terminals 11 and 12
- 24V output: Terminals 11 and 13
- 110V output: Terminals 11 and 14
- 220V output: Terminals 11 and 15
Ensure all connections are tight and secure. Double-check all wiring against the product's nameplate and your application requirements before applying power.
5. Operation
Once properly installed and wired, the BK-200VA transformer is designed for continuous, long-term operation under its rated load conditions. Ensure that the total load connected to the output terminals does not exceed the transformer's 200VA rated capacity.
Monitor the transformer during initial operation for any unusual heat, noise, or odors. If any abnormalities are detected, immediately disconnect power and inspect the installation and wiring.
6. Maintenance
Regular maintenance helps ensure the longevity and safe operation of your transformer.
- Periodic Inspection: Periodically inspect the transformer for any signs of physical damage, corrosion, or loose connections.
- Cleaning: Keep the transformer clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquids or abrasive cleaners.
- Ventilation: Ensure that the area around the transformer has adequate ventilation to prevent overheating.
- Terminal Check: Re-check terminal connections periodically to ensure they remain tight.
- Environmental Compliance: Verify that the operating environment continues to meet the specified conditions (Section 2.2).
Always disconnect power to the transformer before performing any maintenance or inspection.
7. Troubleshooting
If you encounter issues with your BK-200VA transformer, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No output voltage | No input power; Incorrect wiring; Internal fault | Check input power supply; Verify wiring connections (Section 4.2); If wiring is correct, contact support. |
| Output voltage too low/high | Incorrect input voltage; Overload; Faulty transformer | Verify input voltage matches specifications; Reduce load to within rated capacity; Contact support if problem persists. |
| Transformer overheating | Overload; Poor ventilation; Loose connections | Reduce load; Ensure adequate airflow around the transformer; Tighten all wiring connections. |
| Unusual noise (humming/buzzing) | Loose laminations; Overload; Mounting issues | Ensure transformer is securely mounted; Check for overload; If noise is excessive, contact support. |
For complex issues or if troubleshooting steps do not resolve the problem, consult a qualified electrician or contact customer support.
8. User Tips
- Output Voltage Selection: The BK-200VA offers multiple output voltage taps. Carefully select the correct terminals for your required voltage (e.g., 12V, 24V, 110V, 220V) to avoid damaging connected devices.
- Split Phase Output: This transformer is a single-phase control transformer. It provides single voltage outputs (e.g., 220V, 110V) relative to a common terminal (terminal 11). It does not inherently provide a split-phase output (e.g., two 120V lines 180 degrees out of phase to create 240V). If a split-phase configuration is required, additional electrical components or a different type of transformer may be necessary.
- QR Code for Specs: Some units may have a QR code on the label. Scanning this code with a browser might provide additional specifications or documentation.
9. Further Information and Support
For detailed diagrams, specific model variants, or further technical assistance, please refer to the official user manual PDF:
You may also contact Finglai Electric customer support for assistance.