EP Series 3 Phase Input Single Phase Output Industrial UPS

EP Series Three-Phase Input Single-Phase Output Line Frequency Industrial UPS (10kVA to 30kVA)

Compact Online UPS With Output Isolation Transformer, N+1 Parallel Design For Small Industrial & IT Critical Loads

Product Overview

      This EP series 3 phase input single phase output UPS adopts full digital control and pure online double conversion topology, supporting N+1 redundant parallel connection up to 6 units. 

      Equipped with built-in output isolation transformer, this EP series 3 phase input single phase output UPS suppresses mains surge, spike interference and load harmonic distortion, optimizing power matching between loads and UPS system. It delivers high reliability and availability for critical power protection, widely deployed for medium and small-scale key facilities including edge data rooms, communication cabinets, financial terminals, tunnel monitoring systems and semiconductor production lines.

Key Features & Benefits

Stable & Reliable Power Performance

   ● Wide input voltage and frequency tolerance reduces battery cycling and prolongs battery service life

   ● Integrated output isolation transformer minimizes neutral-ground voltage and harmonic disturbance to internal inverter

   ● Strong overload and short-circuit endurance protects equipment under harsh grid conditions

   ● Independent heat dissipation structure guarantees stable operation in tough installation environments

   ● True online double conversion architecture provides uninterrupted regulated power supply

Excellent Grid & Generator Compatibility

   ● Ultra-wide input voltage and frequency range adapts to unstable utility grid and diesel generator power supply

   ● Full DSP digital control improves overall system stability and dynamic response

User-Friendly Intelligent Operation

   ● Masterless autonomous current sharing parallel control, maximum 6 units for capacity expansion or redundancy

   ● Intuitive LCD panel for real-time status monitoring and local operation

   ● Optional RS232/RS485, SNMP and dry contact interfaces for remote centralized management

Universal Technical Specifications (All 4 Models Share These Parameters)

Main Input

Rated Input: 380Vac + N + PE three-phase

Input Voltage Range: 286-473Vac

Input Frequency Range: 50Hz±10%

Inrush Current: >20%

Bypass Section

Static Transfer Time: 0ms via static switch control

Bypass Overload Capacity: 200% load for 5 minutes; 1000% load for 10 seconds

Frequency Synchronization Range: ±1Hz, ±2Hz, ±3Hz adjustable

Manual Maintenance Bypass: Available

Battery Specification

Battery Type: Sealed lead-acid maintenance-free battery

DC Bus Voltage: 384Vdc

Battery Strings: 32 cells (29-32 cells optional)

Max Charging Current: 10A

Battery Deep Discharge Protection: Auto shutdown trigger

Output Performance

Nominal Output Voltage: 220Vac

Output Power Factor: 0.8

Voltage Regulation: ±1% for static load; ±2% for 100%-0% load step change

Battery Mode Frequency Stability: 50Hz±0.1%

THD: <1% linear full load; <3% 100% nonlinear load

Frequency Tracking Window: 46-54Hz

Output Waveform: Pure sine wave

Overload Characteristic: 125% load runs over 10 minutes; above 150% load transfers to bypass and shuts down after over 1 minute

Crest Factor: 3:1

Short-circuit Protection: Hardware auto-protection with bypass breaker trip

Inverter Fault Transfer: Automatic switchover protection

Topology: Online double conversion with built-in output isolation transformer

Full Load Efficiency: Above 90%

Environmental Conditions

Noise Level (2m front distance): <50dB

Operating Temperature: -10℃ to 40℃

Storage Temperature: -25℃ to 60℃ (battery excluded)

Relative Humidity: Below 95% non-condensing

Altitude Rating: No derating below 1000m

System Functions

N+1 Parallel Redundancy: Supported

Protection List: overload, short circuit, overtemperature, battery over/undervoltage

Cold DC Start: Supported

Generator Compatibility Mode: Supported

LCD Display Content: transformer status, rectifier status, inverter status, battery/bypass/alarm status, operation mode, electrical readings, historical fault log, language setting, ECO mode

Fan Control: Auto speed adjustment

Ingress Rating: IP20

Alarm Triggers: mains failure, battery abnormal voltage, overload, UPS fault, short circuit

Communication: Standard RS232 & USB; optional SNMP / dry contact terminals

Monitoring Software: Multi-OS supported, enables remote status check and remote shutdown

Model-Specific Dimension & Weight Table

Typical Application Scenarios

     1.Edge data centers and communication server rooms

     2.Financial service branches, securities trading and bank data terminals

     3.Highway / railway tunnel lighting and monitoring control rooms

     4.Port information centers and urban stadium control systems

     5.Semiconductor manufacturing lines and factory automated production control nodes

Frequently Asked Questions

Q1: How many units of this EP series 3 phase input single phase output UPS can be paralleled?

A1: The masterless parallel architecture allows up to 6 units for N+1 redundancy or capacity expansion.

Q2: Can this UPS work with diesel generator power supply?

A2: Yes, wide frequency and voltage input range is optimized for generator fluctuating output.

Q3: What is the advantage of built-in output isolation transformer?

A3: It suppresses surge noise, reduces neutral-ground voltage and lowers load harmonic feedback to upstream grid.

Q4: Does the unit support maintenance bypass operation?

A4: Manual maintenance bypass is equipped for hot servicing without powering down critical loads.

Q5: What is the derating rule for high altitude installation?

A5: Full power output can be achieved below 1000m altitude, capacity derating is required above this height.

Quality & Compliance

      This line frequency UPS adopts industrial-grade redundant component design, all performance indicators are verified under standardized factory testing for long-term stable operation at commercial and light industrial sites.

Request Custom Quotation

      Fill out the inquiry form with your required capacity, grid condition, parallel plan and battery backup runtime, our technical sales team will send tailored quotation and complete datasheet within 24 working hours.