The YN-XP502F-3T Dry-Type Transformer Intelligent Monitoring Device is designed for temperature monitoring, cooling control, alarm protection and remote communication in dry-type transformers. It continuously monitors transformer winding temperatures using Pt100 sensors and provides configurable fan control, over-temperature alarm, trip output, fault indication and historical data recording.
Designed for operation in high-voltage and strong electromagnetic interference environments, the YN-XP502F-3T combines reliable EMC/EMI performance, a 2.8-inch color touch display, wide-range AC/DC power input and Modbus RTU communication in a compact panel-mounted device.
Dry-Type Transformer Temperature Monitoring and Protection
Dry-type transformer winding temperature is an important operating parameter for evaluating thermal loading and controlling the transformer cooling system. The YN-XP502F-3T continuously acquires temperature signals from Pt100 sensors installed in the transformer windings and displays the measured values directly on the front panel.
In addition to temperature indication, the device can automatically control cooling fans and activate alarm or trip outputs when preset temperature thresholds are reached. This allows one controller to perform temperature measurement, cooling control and transformer over-temperature protection.
Key Features of the YN-XP502F-3T
3-Channel Pt100 Winding Temperature Monitoring
The YN-XP502F-3T supports three Pt100 temperature measurement channels for monitoring the three-phase windings of a dry-type transformer. The measurement range is -30.0°C to 240.0°C with 0.1°C resolution.
2.8-Inch Color Touch Screen
A 2.8-inch color LCD touch screen displays real-time winding temperatures, fan operating status, winding alarm status, trip status and device fault information. The clear graphical interface simplifies commissioning, operation and maintenance.
Automatic Cooling Fan Control
The transformer cooling fan can be controlled automatically according to configurable start and stop temperatures. Manual fan operation and scheduled fan operation are also available, allowing the cooling strategy to be adapted to different transformer operating requirements.
Over-Temperature Alarm and Trip Protection
Independent temperature thresholds can be configured for fan stop, fan start, winding over-temperature alarm and winding over-temperature trip. When the monitored temperature reaches the configured level, the corresponding alarm or control output is activated.
Historical Temperature and Event Recording
The built-in real-time clock and historical data function record transformer temperature information and maximum temperature values. Event information can also indicate fan operation, alarm, trip and device fault status, helping maintenance personnel review transformer thermal events.
Modbus RTU Communication
The YN-XP502F-3T supports the standard Modbus RTU protocol. Communication address, baud rate and parity can be configured from the device interface, making the controller suitable for integration with PLC, SCADA, transformer monitoring systems and industrial automation networks.
EMC and EMI Performance for Transformer Environments
The controller is designed for dry-type transformer installations where high voltage and electromagnetic interference may be present. The internal modular design separates strong-current and weak-current circuits to reduce electrical interference and improve operational stability.
YN-XP502F-3T Technical Specifications
| Parameter | Specification |
|---|---|
| Model | YN-XP502F-3T |
| Product Type | Dry-Type Transformer Intelligent Monitoring Device / Temperature Controller |
| Temperature Sensor | Pt100 |
| Temperature Measurement | 3-Channel Winding Temperature Monitoring |
| Measurement Range | -30.0°C to 240.0°C |
| Measurement Accuracy | ±1%FS |
| Controller Accuracy Class | Class 0.5 |
| Sensor Class | Class B |
| Resolution | 0.1°C |
| Power Supply | AC/DC 24–240 V |
| Operating Frequency | 50 Hz or 60 Hz (±2 Hz) |
| Power Consumption | ≤10 W |
| Control Contact Capacity | 16 A / 250 VAC |
| Display | 2.8-Inch Color LCD Touch Screen |
| Communication | Modbus RTU |
| Communication Address | 1–247 |
| Baud Rate | 1200–38400 bps |
| Default Baud Rate | 9600 bps |
| Parity | None / Odd / Even |
| Operating Temperature | -25°C to +55°C |
| Operating Humidity | ≤95% RH at 25°C |
| Installation | Embedded Panel Mounting |
| Overall Dimensions | 96 × 96 × 84 mm |
| Panel Cutout | 90 × 90 mm |
Temperature Control and Protection Settings
The YN-XP502F-3T allows the cooling and protection thresholds to be configured according to actual transformer operating requirements. The following values are factory default settings and can be adjusted during commissioning.
| Code | Function | Setting Range | Factory Default |
|---|---|---|---|
| C1 | Fan Stop Temperature | 0.0°C to 185.0°C | 85.0°C |
| C2 | Fan Start Temperature | C1 + 5.0°C to 190.0°C | 100.0°C |
| C3 | Winding Over-Temperature Alarm | C2 + 5.0°C to 195.0°C | 130.0°C |
| C4 | Winding Over-Temperature Trip | C3 + 5.0°C to 200.0°C | 150.0°C |
Temperature Compensation
Individual channel temperature compensation is available to correct differences between measured values according to installation and commissioning requirements. The compensation range is ±19.9°C.
Fan Timing Function
The fan timing function provides additional flexibility for transformer cooling and fan maintenance.
| Function | Setting Range |
|---|---|
| Scheduled Fan Run Time | 1–100 Minutes |
| Scheduled Fan Interval | 1–100 Hours |
| Manual Fan Automatic Stop Time | 1–100 Hours |
Modbus RTU Communication for PLC and SCADA Integration
The YN-XP502F-3T can transmit winding temperature and operating status information to an upper-level monitoring system through Modbus RTU communication. This makes it suitable for dry-type transformer monitoring systems, PLC cabinets, SCADA systems and other industrial automation platforms.
| Communication Parameter | Range / Setting | Default |
|---|---|---|
| Protocol | Modbus RTU | Modbus RTU |
| Device Address | 1–247 | 1 |
| Baud Rate | 1200–38400 bps | 9600 bps |
| Parity | None / Odd / Even | None |
| Data Length | 8 Bits | 8 Bits |
| Stop Bit | 1 Bit | 1 Bit |
The communication registers provide access to CH1, CH2 and CH3 temperatures as well as relay status information including fan operation, over-temperature alarm, over-temperature trip and device fault status.
Historical Data and Transformer Event Monitoring
The historical data function helps maintenance teams review transformer temperature conditions and operating events. Recorded information includes measured temperatures, maximum temperatures and event status associated with cooling fan operation, alarm, trip and device faults.
This function is especially useful for troubleshooting abnormal temperature events, evaluating transformer loading conditions and reviewing thermal behavior after an alarm or trip.
Panel Installation Dimensions
The YN-XP502F-3T uses an embedded panel-mounted design suitable for transformer control cabinets and retrofit installations.
| Installation Parameter | Dimension |
|---|---|
| Installation Method | Embedded / Panel Mounted |
| Overall Dimensions | 96 × 96 × 84 mm |
| Required Panel Cutout | 90 × 90 mm |
Replacement for Imported Dry-Type Transformer Temperature Controllers
The YN-XP502F-3T can be used as a replacement and retrofit option for selected imported dry-type transformer temperature controllers used for Pt100 winding temperature monitoring, cooling fan control, over-temperature alarm and transformer trip protection.
For retrofit projects, INNO can assist customers in evaluating the existing controller configuration and selecting the appropriate YN-XP502F-3T connection method. Before replacement, the existing sensor type, power supply, panel opening, relay control logic, terminal wiring and communication requirements should be confirmed.
Typical Functions for Retrofit Projects
- Pt100 transformer winding temperature measurement
- Three-phase temperature display
- Cooling fan automatic start and stop
- Over-temperature alarm output
- Over-temperature trip output
- Device and sensor fault monitoring
- Manual fan control
- Temperature compensation
- Historical temperature and event recording
- Modbus RTU remote communication
- PLC and SCADA system integration
Important: Replacement suitability should be confirmed according to the original controller wiring, sensor configuration, panel cutout, contact logic and system requirements. Contact INNO with the existing controller model, wiring diagram or terminal photograph for retrofit confirmation.
Typical Applications
- Dry-type power transformers
- Cast-resin transformers
- Distribution transformers
- Industrial dry-type transformers
- Transformer control cabinets
- Electrical distribution rooms
- Data center transformer systems
- Industrial plants and manufacturing facilities
- Commercial building power distribution systems
- Transformer retrofit and modernization projects
Why Choose the YN-XP502F-3T?
The YN-XP502F-3T combines transformer temperature monitoring, fan control, protection outputs, historical data and digital communication in one compact controller. It is suitable for both new dry-type transformer projects and replacement applications where customers require a modern temperature monitoring device with a color touch display and remote communication capability.
- Designed specifically for dry-type transformer temperature monitoring
- Wide AC/DC 24–240 V power supply range
- Pt100 temperature measurement with 0.1°C resolution
- Configurable cooling, alarm and trip thresholds
- Large 16 A / 250 VAC control contact capacity
- Modbus RTU for remote transformer monitoring
- Historical temperature and event records
- Compact panel-mounted construction
- Suitable for replacement and retrofit applications
- Technical support for wiring and system integration
Standards and Testing
| Item | Standard |
|---|---|
| Production Standard | JB/T 7631-2016 Electronic Temperature Controllers for Transformers |
| Quality Management System | ISO 9001:2015 |
| Environmental Management System | ISO 14001:2015 |
| Occupational Health and Safety Management System | ISO 45001:2018 |
| EMC Test Standard | IEC 61000-4:2005 |
| EMC Test and Measurement | GB/T 17626-2008 |
YN-XP502F-3T Frequently Asked Questions
What is the YN-XP502F-3T used for?
The YN-XP502F-3T is an intelligent monitoring and temperature control device for dry-type transformers. It monitors winding temperatures through Pt100 sensors and provides cooling fan control, over-temperature alarm, trip protection, fault indication and remote communication.
How many winding temperatures can the YN-XP502F-3T monitor?
The YN-XP502F-3T provides three-channel Pt100 winding temperature monitoring, typically used for the three phases of a dry-type transformer.
Does the YN-XP502F-3T support Modbus RTU?
Yes. The YN-XP502F-3T supports standard Modbus RTU communication. The communication address, baud rate and parity can be configured for integration with PLC, SCADA and transformer monitoring systems.
Can the YN-XP502F-3T control transformer cooling fans?
Yes. Users can configure fan start and stop temperatures. The device also supports manual fan operation and scheduled fan operation.
Does it provide over-temperature alarm and trip outputs?
Yes. Separate configurable thresholds are provided for winding over-temperature alarm and over-temperature trip protection.
Can the YN-XP502F-3T replace an existing imported transformer temperature controller?
Yes. The YN-XP502F-3T is available as a replacement option for selected imported dry-type transformer temperature controllers with comparable Pt100 temperature monitoring, fan control, alarm and trip functions. Because terminal assignments and control logic may differ between controllers, the existing wiring diagram and application requirements should be checked before replacement.
What information should I provide for a replacement project?
Please provide the existing temperature controller model, front and rear photographs, terminal wiring diagram, Pt100 sensor configuration, supply voltage, required alarm and trip contacts, communication requirements and panel opening dimensions. INNO can then help evaluate compatibility.
What is the power supply range?
The YN-XP502F-3T supports a wide AC/DC 24–240 V power supply range.
What is the temperature measurement range?
The measurement range is -30.0°C to 240.0°C with a resolution of 0.1°C.
What are the installation dimensions?
The controller has overall dimensions of 96 × 96 × 84 mm and requires a 90 × 90 mm panel cutout for embedded installation.
Request a Quote or Replacement Evaluation
If you are selecting a dry-type transformer temperature controller for a new transformer or need to replace an existing imported monitoring device, send us your technical requirements, existing wiring diagram or controller photos.
INNO can assist with model selection, Pt100 temperature monitoring requirements, relay control configuration, Modbus RTU communication and retrofit compatibility evaluation.
