Prostar PET3320 3 phase double-conversion 20kva online ups power supply ensures continuous isolation from utility disturbances, delivering clean and reliable power to sensitive equipment.
The 20kva online ups is equipped with a powerful DSP control system. It offers real-time monitoring. It also provides intelligent fault diagnosis and comprehensive protection functions. A user-friendly LCD interface shows detailed operating status. It also displays electrical parameters and alarm information. This allows operators to manage the system efficiently and safely.
The 20kva online ups provides true online operation. It completely isolates connected loads from input power disturbances. These disturbances include voltage fluctuations, harmonics, frequency variations, and power outages. Its robust three-phase design and high efficiency make it an ideal solution for medium-capacity power protection needs.
20kVA Online UPS System Key Features
True Double-Conversion Online Technology
Provides zero transfer time and complete electrical isolation for maximum power protection.
High Output Power Quality
Pure sine wave output with tight voltage and frequency regulation.
3-Phase Input / 3-Phase Output Design
Ideal for balanced three-phase loads in medical, commercial, and IT environments.
Wide Input Voltage and Frequency Range
Maintains stable operation under unstable grid conditions, reducing battery usage and extending battery life.
Intelligent Battery Management
Supports flexible battery configuration and optimized charging control.
Transformerless High-Efficiency Design
Compact structure with reduced weight and higher efficiency, lowering energy consumption and total cost of ownership.
User-Friendly LCD Display and LED Indicators
Real-time monitoring of system status, alarms, and electrical parameters for easy operation and maintenance.
UPS 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.
Uninterruptible Power Supply System 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
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 / External battery bank
- Battery Configuration: 32-40 units(adjustable) for 12v battery
- Backup Time: Configurable via battery capacity
- Charging Method: Intelligent multi-stage charging
Parallel Operation
- Parallel Capability: Up to 4 units
- Parallel Mode: Capacity expansion or N+1 redundancy
- Battery System: Shared battery bank supported
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: 250x695x545mm
| Model | PET3320 |
| Capacity | 20KVA/20KW |
| Topology | Double conversion online |
| Noise | Less than 65dBA front side 1M |
| Dimension(WxDxH mm) | 250x695x545 |
| Weight(Kg) | 35 |
| INPUT | |
| Low Line Loss Voltage | 110VAC(L-N) ± 3% at 50% load, 176VAC(L-N) ± 3% at 100% load |
| Low Line Comeback Voltage | Low line loss voltage + 10V |
| High Line Loss Voltage | 300VAC(L-N) ± 3% at 50% load, 276VAC(L-N) ± 3% at 100% load |
| High Line Comeback Voltage | High line loss voltage -10V |
| Input Frequency Range | 50Hz: 46-54Hz, 60Hz: 56-64Hz |
| Input Power Factor | ≥0.99 at 100% load |
| OUTPUT | |
| Output Rated Voltage | 3P + N + PE, 360Vac/380Vac/400Vac/415Vac ± 1% |
| Output Frequency | AC mode: 50Hz: 46-54Hz, 60Hz: 56-64Hz; Battery mode: 50Hz/60Hz ± 0.1Hz |
| Output Power Factor | 1 |
| Total Harmonic Distortion | ≤ 2% at 100% linear load; ≤ 5% at 100% non-linear load |
| Overload Capacity | AC mode: 100%-110%: 60mins; 110%-125%: 10mins; 125%-150%: 1min; >150%: immediately Battery mode: 100%-110%: 60mins; 110%-125%: 10mins; 125%-150%: 1min; >150%: immediately |
| Crest Factor | 3:1 |
| Wave Form | Pure sine wave |
| Transfer Time | Line –> Battery: 0ms; Inverter –>Bypass: 0ms(When phase lock fails, <4ms interruption occus from inverter to bypass); Inverter –> ECO: <10ms |
| EFFICIENCY | |
| Efficiency at full load (AC-AC) | >95.5% |
| Efficiency at battery mode | >94.5% |
| BATTERY | |
| Battery Type | Depending on applications |
| Battery Number | 32-40 units(adjustable) for 12v battery |
| Battery Voltage | +/- 192VDC – +/-240VDC |
| Battery Charging Current | 2A – 24A ± 10% adjustable |
| Battery Charging Voltage | +/- 13.65VDC *N ± 1% (N=16~20) |
| SYSTEM | |
| IP Protection | IP20 |
| Number of Parallel | < 6 Units |
| Cooling Method | Fans |
| Display | 7-inch LCD Touch Screen |
| Audible Alarm | Audible and visible alarms prioritized by severity |
| ENVIRONMENT | |
| Operating Temperature | 0℃ to 40℃ (battery life will down when >25℃) |
| Humidity | 0~95% (non-condensing) |
| Altitude | < 1000m (Capacity de-rates by 1% for every 100m over 1000m) |
| COMMUNICATION | |
| Communication Interface | RS232/RS458/USB |
| Communication Slot | Optional SNMP |
Applications
- Data centers and server rooms
- Medical and healthcare systems
- Telecom and network equipment
- Financial and security systems
- Bank ATM
- Commercial Buildings & Infrastructure
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