PET3320B high efficiency 3 phase 20kva online ups with battery

Prostar PET3320B high efficiency 3 phase 20kva online ups with battery ensures precise voltage regulation (±1%). It also provides a fast transient response and intelligent battery management. Double-conversion online (VFI) — transformerless design for reduced weight and higher efficiency.

The 20kva online ups with battery combines cutting-edge high-frequency transformerless technology with Prostar’s proven reliability. It offers best-in-class efficiency and power density. Additionally, it provides a total cost of ownership suitable for today’s demanding 3-phase critical power environments.

 

20kVA Online UPS With Battery Key Features

Transformerless High-Frequency Design

Delivers higher efficiency, significantly reduced weight and footprint compared to traditional transformer-based UPS systems, while maintaining excellent reliability.

Unity Output Power Factor (PF=1.0)

Outputs full 20kW of active power, allowing you to connect more real-load equipment (servers, data centers, etc.) without derating.

Built-in Battery Support

Flexible internal battery configuration (commonly +/-192VDC  strings, supporting 32 units 12V 9AH VRLA/lead-acid batteries), with optional external battery packs for extended runtime.

Parallel Operation Capability

Supports multiple units in parallel for capacity expansion or N+1 redundancy, enhancing system availability.

Rich Communication Options

Standard RS232/RS485, dry contacts, optional SNMP card for remote monitoring and integration into BMS/DCIM systems.

4.3-inch Touchscreen LCD Display

Intuitive, full-color graphical interface shows real-time parameters like input/output voltage and frequency. It also displays load percentage, battery status, runtime, faults, and more. The interface offers multilingual support for easy local monitoring and configuration.

UPS Uninterruptible Power Supply Connection Diagram

The online double-conversion UPS acts as the core of the system. It continuously converts incoming AC power to DC. Then it converts the DC back to clean, regulated AC power. This design fully isolates the load from input power disturbances such as voltage fluctuations, frequency variations, and electrical noise.

An external battery bank or battery cabinet is connected to the UPS to provide uninterrupted backup power during mains failure. The UPS automatically switches to battery mode without interruption, ensuring continuous operation of connected equipment.

The conditioned and regulated output power from the UPS is delivered to various critical loads. This includes servers, data centers, security systems, networking equipment, and industrial devices. This ensures maximum protection and reliability.

UPS Uninterrupted Power Supply Details

Rear Panel Shown

 

1. SNMP intelligent slot	2. Cold start function	3. RS485 communication port
4. RS232 communication port	5. USB communication port	6. Emergency power off function connector
7. Share current port(only for parallel model)	8. Parallel port (only for parallel model)	9. Line input circuit breaker/switch
10. Manual bypass switch (10kVA – 40kVA optional configuration)	11. Output switch	12. Maintenance bypass switch
13. Line connection terminal	14. Bypass input terminal (10kVA-40kVA optional configuration)	15. Battery switch

 

Rear Panel Connection Terminal

Parallel Wiring Diagram

Dual Input in Parallel Operation

Built-in Battery Inside

20kVA UPS with 32 units 12V 9AH VLRA battery

LCD Display

 

DC Settings Shown

Battery Mode

UPS Specifications

Rated Capacity

• Power Range: 20kVA/20kW

• Output Power Factor: 1.0

AC Input

• Input Phase: Three-phase (3P + N + PE)

• Nominal Voltage: 380 / 400 / 415 Vac

• Voltage Range: 110Vac – 300Vac (P-N)

• Frequency: 50 / 60 Hz (auto-sensing)

• Power Factor: ≥ 0.99

• Input THDi: ≤ 3%

AC Output

• Output Phase: Three-phase (3P + N + PE)

• Output Voltage: 380 / 400 / 415 Vac

• Voltage Regulation: ±1%

• Frequency Accuracy:

  • Utility mode: synchronized to input

  • Battery mode: ±0.1Hz

• Waveform: Pure sine wave

• Total Harmonic Distortion (THDv):

  • Linear load: ≤ 2%

  • Non-linear load: ≤ 5%

Battery

• Battery Type: VRLA battery

• Battery Configuration: Built-in 32x12V 9AH VRLA Battery

• Charging Method: Intelligent multi-stage charging

Parallel Operation

• Parallel Capability: Up to 4 units

• Parallel Mode: Capacity expansion or N+1 redundancy

Communication & Monitoring

• Display: LCD + LED indicators

• Standard Interface: RS232 / RS485 / USB

• Optional Interface: SNMP, WiFi, GPRS, Dry Contact

• Monitoring: Local and remote real-time monitoring

Mechanical

• Design: Transformerless, high-frequency

• Installation: Tower / Cabinet type

• Cooling: Intelligent forced air cooling

• Protection Level: IP20

• Dimension: 250x828x863mm

 

Step-by-Step Installation Guide

1. Unpacking and Inspection

Carefully unpack the UPS on a stable surface. Check for shipping damage (dents, scratches, loose parts). Verify all accessories: user manual, parallel cables (if applicable), communication cables, mounting hardware, and terminal covers. Report any issues to the supplier immediately. Do not install a damaged unit.

2. Site Preparation and Placement

• Select a level, stable floor capable of supporting the UPS weight.
• Ensure minimum clearances for ventilation and service access.
• Position the UPS for easy front access to the touch LCD panel and rear/bottom/top cable entry.
• If floor-standing, secure with anchor bolts if required by local seismic codes.

3. Electrical Preparation

• Confirm input: 3-phase + neutral + PE (380/400/415V typical, wide range tolerance).
• Output: 3-phase + neutral + PE.
• Install upstream protective devices: suitable MCCB or fuse for input (rated for full load current + inrush), bypass line (if dual input used), and output distribution.

4. Power Connections (Input, Output, Battery, Ground)

• Open the rear or bottom access panel to expose input/output/battery terminals (typically busbar style).
• Grounding (PE): Connect protective earth first—use the dedicated PE terminal/bolt. Ensure low-impedance grounding to building ground.
• Input (L1, L2, L3, N): Connect 3-phase input cables. Tighten terminals to manufacturer torque values (typically 20–40 Nm for M8–M12 bolts; check exact label).
• Output (L1, L2, L3, N): Connect to critical load distribution panel.
• Battery (+ and –): Built-in battery inside, no need to prepare extra battery bank.
• For parallel systems: Connect parallel communication cables (share current / parallel ports) between units before powering on.

5. Optional Connections

• EPO (Emergency Power Off): Connect dry contact if required.
• SNMP/monitoring card slot (if equipped): Install optional card for remote monitoring.
• Dry contacts / RS232 / USB for BMS integration.

6. Final Checks Before Power-Up

• Double-check all connections for tightness, correct polarity, and phase sequence (use phase rotation meter).
• Verify no tools or debris left inside cabinet.
• Close all panels and secure covers.

7. Initial Power-Up and Commissioning

• Close upstream input breaker → UPS starts in bypass or online mode (LED/LCD indicates status).
• Connect batteries last: close battery breaker → UPS detects DC voltage and may charge batteries.
• Use the touch LCD to enter setup menu: set date/time, language, equalization charge if needed, parallel mode (if applicable).
• Perform battery test via LCD menu.
• Transfer to online mode (inverter on).
• Gradually apply load and monitor for alarms.
• For parallel setups: Follow Prostar parallel commissioning sequence (master/slave designation, current sharing verification).

Troubleshooting (brief)

• No output: check bypass status, input breaker, internal alarm codes.
• Short runtime: check battery charge, battery age, temperature, and connection integrity.
• Alarms during commissioning: consult event code list and Prostar support.

 

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