1. Introduction
The TOMZN TOMPD-8S is a versatile AC/DC adjustable over and under voltage protector designed for single-phase electrical systems. This device provides reliable voltage monitoring and protection, ensuring the safety and longevity of connected equipment. Featuring microprocessor technology, a built-in LCD, and a user-friendly keypad, it allows for precise digital setting and real-time voltage display. Its compact modular design makes it suitable for Din rail mounting in various electrical panels.
2. Features
- Powered directly by the measuring circuit.
- Compatible with both AC and DC power supplies.
- Microprocessor technology for highly accurate and repeatable protection.
- Integrated LCD and keypad for precise digital settings and display.
- Compact modular 43mm housing for Din rail installation.
- Adjustable overvoltage and undervoltage thresholds.
- Independent adjustable delay times for overvoltage and undervoltage tripping.
- Adjustable reset modes: automatic reset or manual reset.
- Equipped with 1 Changeover (CO) and 1 Normally Closed (NC) contacts.
- Failure recording function stores the last 3 fault events.
- Flame retardant PC shell for enhanced safety.
3. Specifications
Figure 3.1: Product Information and Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | TOMPD-8S |
| Rated Supply Voltage | AC/DC 110V~240V (50-60Hz) |
| Operating Range | AC/DC 40-310V |
| Voltage Setting Range | AC/DC 50.0~300V |
| Voltage Hysteresis | 1.0-90.0V |
| Over- and Undervoltage Tripping Time | 0.1~999s |
| Automatic Reset Time | 0.1~999s |
| Working Conditions | -25°C~65°C, ≤85%RH (non-condensing) |
| Measurement Error | ≤1% with adjustable voltage range |
| Failure Recording | Last 3 faults |
| Output Type | 1CO & 1NC |
| Contact Capacity | 6A, 250VAC/30VDC (resistive load) |
| Degree of Protection | IP 20 |
| Mechanical Durability | 1,000,000 cycles |
| Dielectric Strength | > 2KVAC 1min |
| Certification | CE |
| Protect Feature | Sealed |
Figure 3.2: LCD Indication Descriptions
| LCD Indication | Description |
|---|---|
| U> | Overvoltage fault indication or overvoltage setting indication |
| U< | Undervoltage fault indication or undervoltage setting indication |
| SET | Parameter setting indication |
4. Installation and Wiring
The TOMPD-8S is designed for easy installation on a standard Din rail. Ensure all power is disconnected before attempting installation or wiring.
4.1 Physical Installation
- Mount the device securely onto a 35mm Din rail in your electrical panel.
- Ensure adequate ventilation around the device to prevent overheating.
4.2 Wiring Diagram
Connect the device according to the wiring diagram below. Ensure correct polarity for DC circuits and proper phase/neutral connections for AC circuits. It is recommended to install appropriate fuses for protection.
Figure 4.1: Standard Wiring Diagram for TOMPD-8S
Terminal Descriptions:
- A1+, A2-: Power supply input terminals.
- 18(14): Common contact for the relay output.
- 15(11): Normally Open (NO) contact for the relay output.
- 26(22): Normally Closed (NC) contact for the relay output.
- 25(21): Another Normally Open (NO) contact for the relay output.
The diagram shows the input from the top side, connecting Line (L+) and Neutral (N-) through fuses to the device's A1+ and A2- terminals. The relay output contacts (18, 15, 26, 25) are used to control a contactor (KM) which in turn controls the LOAD. The 'Power-off position' indicates the state when the load is disconnected.
5. Operating Instructions
The TOMPD-8S features an LCD display and a keypad for easy operation and parameter setting.
5.1 Display and Buttons
Figure 5.1: Front Panel with LCD and Control Buttons
The front panel includes:
- LCD: Displays current voltage and setting parameters.
- RST (Red Button): Used for Reset/Test functions.
- + (Black Button): Used for increasing setting values.
- - (Grey Button): Used for decreasing setting values.
- MOD (Green Button): Used for setting parameters and navigating menus.
5.2 Parameter Setting Method
To configure the protection parameters, use the MOD button to enter the setting mode and navigate through options, and the + / - buttons to adjust values. The RST button can be used to exit or confirm in some cases.
Figure 5.2: Parameter Setting Method and Ranges
| LCD Indication | Parameter | Setting Range | Default |
|---|---|---|---|
| U> SET | Overvoltage threshold | AD220: 50.0-300V-OFF | AD220: 253V |
| tU> S SET | Overvoltage delay time | 0.1-999s | 5s |
| U< SET | Undervoltage threshold | AD220: 50.0-300V-OFF | AD220: 187V |
| tU< S SET | Undervoltage delay time | 0.1-999s | 5s |
| U>U< SET | Voltage hysteresis | AD220: 1.0-90.0V | AD220: 10.0V |
| oRU SET | Reset mode | AU/HA/SA*2 | AU |
| t 3.0 S SET | Reset time | 0.1-999s | 3S |
| F50 SET | Voltage frequency | 50/60Hz | 50Hz |
| r 3.0 | Item version | Ver3.0 | --- |
| End SET | Exit*4 | --- | --- |
The device can display four monitoring data points in turn, including overvoltage protection (OV) and undervoltage protection (UV) settings, as shown in Figure 5.3.
Figure 5.3: Example of Monitoring Data Display
6. Maintenance
The TOMPD-8S is designed for minimal maintenance. Regular checks can help ensure optimal performance:
- Cleaning: Keep the device clean and free from dust. Use a dry, soft cloth for cleaning. Do not use abrasive cleaners or solvents.
- Connections: Periodically check all wiring connections to ensure they are tight and secure. Loose connections can lead to intermittent operation or damage.
- Environment: Ensure the operating environment remains within the specified temperature and humidity ranges (-25°C~65°C, ≤85%RH, non-condensing).
7. Troubleshooting
If you encounter issues with your TOMPD-8S, refer to the following common problems and solutions:
- Device not powering on: Check the input voltage at terminals A1+ and A2- to ensure it is within the rated supply voltage (AC/DC 110V~240V). Verify that fuses are intact.
- Device trips unexpectedly: Review your overvoltage and undervoltage threshold settings (U> SET, U< SET) and delay times (tU> S SET, tU< S SET). Ensure they are appropriate for your application and that the actual voltage is not exceeding these limits.
- Device does not reset after a trip: Check the 'Reset mode' setting (oRU SET). If set to 'HA' (manual reset), you will need to manually reset the device after a fault. If set to 'AU' (automatic reset), verify the 'Reset time' (t 3.0 S SET) is configured correctly.
- Incorrect voltage reading on LCD: Ensure the device is correctly wired and the input voltage is stable. If the error persists, the measurement error is typically ≤1%, but significant discrepancies may indicate a fault or incorrect wiring.
8. User Tips
- Solar Inverter Protection: This device can be considered for protecting solar inverters from under/over voltage conditions. However, always verify compatibility with the specific DC output characteristics of your solar panel system and inverter. Ensure the operating range of the protector matches the inverter's voltage.
- Setting Precision: When setting overvoltage or undervoltage thresholds, consider a small buffer (hysteresis) to prevent frequent tripping due to minor voltage fluctuations. The adjustable voltage hysteresis (U>U< SET) can help manage this.
- Fault History: Utilize the failure recording feature to check the last 3 faults. This can provide valuable diagnostic information for recurring issues.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase. Ensure to provide the model number (TOMPD-8S) and a detailed description of the issue when seeking support.
