SINOTIMER STVP-932 Three-phase Multifunctional Adjustable Voltage Protector User Manual

1. Introduction

The SINOTIMER STVP-932 is a three-phase, four-wire adjustable automatic recovery overvoltage and undervoltage multifunctional protector. It is designed for AC 380V, 50/60Hz electrical systems with a rated working current up to 80A. This device provides essential protection for electrical equipment by instantaneously cutting off the power supply when overvoltage or undervoltage conditions are detected. It automatically restores power once the circuit voltage returns to normal operating parameters.

The protector features a low-power, high-definition backlit LCD display that rotates to show real-time voltage and current for each phase (A, B, C).

Video: Demonstration of STVP-932 features including real-time voltage display, over/under voltage protection, phase loss, phase sequence, neutral wire break protection, and parameter adjustment.

2. Key Features and Protection Functions

• Over-voltage protection
• Under-voltage protection
• Voltage display (separate A, B, C phase voltage measurement)
• Three-phase voltage unbalance protection
• Phase sequence protection (reverse phase protection)
• Zero line break protection
• Phase failure protection
• Adjustable over-voltage protection value
• Adjustable over-voltage recovery value
• Adjustable over-voltage protection action time
• Adjustable under-voltage protection value
• Adjustable under-voltage recovery value
• Adjustable under-voltage protection action time
• Adjustable 3-phase voltage unbalance protection value
• Adjustable 3-phase voltage unbalance protection action time
• Adjustable delay time after power-on
• Adjustable fault recovery delay time
• Reset mode selection
• Fault inquiry (stores up to 5 fault records)
• Factory data reset option

3. Specifications

4. Installation and Wiring

The STVP-932 is designed for 35mm DIN rail installation. Ensure all power is disconnected before attempting installation or wiring.

4.1 Wiring Diagram

Important Safety Note: This device does not have overload or short-circuit protection. It must be used in conjunction with appropriate mini circuit breakers (e.g., C45, C65) to ensure comprehensive circuit protection.

5. Operating Instructions

5.1 Display and Controls

The LCD displays real-time voltage for each phase (A, B, C). Use the 'SET', 'Up' (▲), and 'Down' (▼) buttons for configuration.

5.2 Parameter Setting Method

1. Press and hold the SET button for 3 seconds to enter the parameter setting mode.
2. Continuously press the SET button to cycle through the adjustable parameters (P01 to P14).
3. Use the Up (▲) or Down (▼) buttons to adjust the value of the currently displayed parameter.
4. Once all desired parameters are set, press the SET button again when "ENd" appears on the display. This will save the data and exit the setting mode.
5. If no operation is performed within 10 seconds while in setting mode, the device will automatically exit, and any unsaved changes will be lost.

5.3 Adjustable Parameters (P01-P14)

Reset Mode (P12):

• AU (Automatic Reset): The device will automatically restore power after a fault clears and the recovery delay time (P11) has passed.
• HA (Manual Reset): The device requires manual intervention (power off and then power on) to resume operation after a fault.

Fault Inquiry (P13): Press the Up (▲) button to view the last 5 fault records (E1-E5). ">U" indicates an overvoltage fault, and "<U" indicates an undervoltage fault.

6. Maintenance

The STVP-932 is designed for reliable operation with minimal maintenance. Periodically inspect the wiring connections to ensure they are secure and free from corrosion. Keep the device clean and free from dust and moisture. Do not attempt to open or repair the device yourself; refer to qualified personnel for any servicing needs.

7. Troubleshooting

• Device not turning on: Check the power supply connections and ensure the input voltage is within the operational range.
• Device trips frequently: Review the set protection values (P01-P08) and action times (P03, P06, P08). Adjust them if necessary to match your system's requirements and stability.
• "ABC" character displayed on LCD: This indicates a phase sequence issue. Arbitrarily reverse any two phase lines (fire lines L1, L2, or L3) at the input to correct the phase sequence.
• Zero-phase protection not working with a running motor: The zero-phase protection may be ineffective when a three-phase motor is already running, as it cannot distinguish the fault due to back-EMF.
• Device humming under load: Some users have reported a slight humming sound under load. This may be normal operation, but ensure all connections are tight to rule out loose wiring.
• Settings not saving: Ensure you press the SET button again when "ENd" appears on the display to confirm and save your changes. If you exit the setting mode without confirming, changes will be lost.
• No overload/short circuit protection: Remember, this device does not provide overload or short-circuit protection. If you experience such issues, check your external circuit breakers (e.g., C45, C65).

For further assistance, refer to the contact information provided in the Warranty/Support section.

8. User Tips

• Parameter Persistence: All configured settings are saved automatically and will persist even after power loss.
• Recovery Delay: Utilize the adjustable recovery delay time (P11) to prevent rapid cycling of equipment during intermittent voltage fluctuations.
• Phase Sequence Check: If the device displays "ABC" on the LCD, it indicates an incorrect phase sequence. Simply swap any two of the L1, L2, L3 input wires to correct this.
• External Protection: Always install appropriate external circuit breakers (e.g., C45, C65) in conjunction with this protector, as it does not offer overload or short-circuit protection.
• Current Rating: The maximum load current (e.g., 80A) refers to the total current capacity of the device, not per phase. Ensure your total load does not exceed this rating.
• Voltage Compatibility: This device is designed for AC 230/400V systems. It is not suitable for 127V systems without appropriate voltage conversion.

9. Warranty and Support

For technical support, inquiries, or warranty claims, please contact the distributor:

A PDF version of this user manual is available for download from the manufacturer's website or by contacting support directly.