Industrial UPS

Industrial UPSs are regarded as fully customized power supply systems for rugged environments and designed particularly to safeguard critical loads in industrial applications where voltage transients, created by degraded mains supply, can seriously damage both UPS and the critical load.

Industrial UPS Systems are fully flexible and customizable and designed for active–on line installation between the power source, by-pass source and critical load where the inverter delivers regulated AC voltage and frequency to the load and rectifier delivers regulated DC voltage / current to the DC load at all times without interruption.

The power conversion process isolates the critical load from the normal mains disturbances and isolates the mains from load induced reflected harmonics affecting other loads connected to the input mains feeder. The rectifier converts AC power into DC to charge lead acid or nickel cadmium batteries; it also provides the necessary DC for continuously rated capacity of the inverter. IGBT semiconductor modules are used in PWM inverter and the control logic creates the precise sinusoidal output waveform with a very low harmonic content. Thyristor semiconductor modules are also used in rectifier for reliable operation.

The system consists of rectifier / charger, inverter, static bypass, maintenance bypass, rectifier isolation transformer, inverter isolation transformer, bypass line isolation transformer, automatic line stabilizer, DC distribution, AC distribution, controls and monitoring. The AC output of the inverter is connected to the critical load, the storage battery is connected between the inverter input and rectifier / charger output through a battery isolation MCB. The normal AC input power is connected to the rectifier; the bypass circuit also takes power from the same power source to provide power for the critical load during bypass operation when the system is in maintenance mode.

PMI Industrial UPS Systems are widely used in different industries such as Power Generation, Power Distribution, Power Transmission, Manufacturing, Transportation, Mining, Refining, Petrochemical Plants, Oil & Gas, Hospitals, Airports with different applications such as Gas Turbine Control, Switchgear tripping, Signalling, Alarms, Emergency Lighting, DCS (Distributed Control System) etc.

  • On-line double conversation topology
  • Customized products based on specification
  • Independent modules (Rectifier, Inverter and optional Stabilizer on bypass) sized individually
  • Option of operation with multi front panels to give full control on the system to operator
  • Galvanically isolated output (inverter transformer is standard, rectifier and bypass transformers are optional) for maximum safety on critical loads
  • SCR Rectifier to ensure reliable operation in rugged mains conditions
  • IGBT (PWM) controlled inverter with high frequency switching to ensure no waveform distortion for reactive and nonlinear loads.
  • Compatible with Lead Acid ( vented/sealed) and NiCd (vented/gas recombination) batteries
  • Communication (Free alarm contacts, remote PC monitoring, Modbus, SNMP, Profibus, DNP 3.0 via RS 232, RS 485, USB or Ethernet TCP/IP ports)
ModelKGK Series
TopologyDouble Conversion Online System with Output Isolation Transformer
ControlMicroprocessor Controlled System
TopologyFull Bridge Phase Angle Controlled Thyristor Module Rectifier
ControlMicroprocessor Controlled System
Isolation Transformer (OPTIONAL)Galvanically Isolated
Nominal Input Voltage110 VAC / 220 VAC / 230 VAC / 240 VAC / 380 VAC / 400 VAC / 415 VAC / 480 VAC ±15%
Nominal Input Frequency50 hz. ±5% or 60 hz. ±5%
Input Cosφ≥ 0.8 Inductive (6 Pulse) ≥ 0.85 Inductive (12 Pulse) ≥ 0.95 Inductive (12 Pulse with active harmonic elimination)
Total harmonic Distortion (THDi)≤ 30% (6 Pulse), ≤ 10% (12 Pulse), ≤ 5% (12 Pulse with active harmonic elimination)
Nominal DC Voltage110 VDC / 125 VDC / 144 VDC / 220 VDC / 264 VDC / 360 VDC
Battery Charging Principle Constant Current / Constant Voltage
Float Charge Voltage (V/Cell)2,4 Lead Acid Battery 1,60 NiCd Battery (Based on battery brand and type)
Boost Charge Voltage (V/Cell)2.23 Lead Acid Battery 1,40 NiCd Battery Based (Based on battery brand and type)
ProtectionsInput: Thermic-Magnetic Over Current Protection, Over Voltage Protection, Phase Sequence Free Operation (3 Phase), Soft Start, MCB Output: Short Circuit Protection, Over Voltage Protection Battery: L-C filters, Overcurrent and Over Voltage Protection
MeasurementsLCD Display for Line Voltage / Frequency / Current (Standard in 1 Phase, Optional for 3 Phase), Battery Output Voltage / Current, Load Output Voltage, Charger Total Output Current
IndicatorsFloat Mode, Boost Mode, Current Mode, Equalize Mode, Battery Ending, Low Battery, Battery Test Failure, Line Failure, Fan Failure, Over Voltage, Under Voltage, Over Temperature, Rectifier Failure, SCR Fuse Failure, Mains Available, Load MCB, Battery MCB
Adjustable ParametersFloat Charge Voltage, Boost Charge Voltage, Equalize Charge Voltage, Battery Charge Current, Rectifier Total Output Current, Low Battery Voltage Alarm, Earth Fault Leakage Current Alarm (only available in 4 line LCD), Battery Ending Voltage Alarm, Online Battery Test Parameters, Auto Boost Charge Parameters, Password
Event HistoryLast 250 events recorded and displayed on front panel and on PC via RS 232
Open or closed free alarm contacts Low Battery, Mains Input Normal / Failure, Charger Failure, Overtemperature, Charger Overvoltage, Load MCB ON/ OFF, Battery MCB ON / OFF, Earth Fault
Sound AlarmOn Warning Messages 2 Short ‘beep’ per 2 seconds
Topology3 Full Bridge 6 high Frequency IGBT Inverter Modules (3 Phase); 1 Full Bridge 2 high Frequency IGBT Inverter Modules (1 Phase)
Isolation TransformerGalvanically Isolated (standard)
Power Factor0.8
Nominal Input Voltage110 VDC / 125 VDC / 144 VDC / 220 VDC / 264 VDC / 360 VDC
Nominal Output Voltage110 VAC / 220 VAC / 230 VAC / 240 VAC / 380 VAC / 400 VAC / 415 VAC / 480 VAC
Voltage Tolerance
Static± 1%
Dynamic with 100% load change± 10% in 50 msec.
Between 100% – 125%10 min.
Between %125 – 150%1 min.
Between %150 – 300%1 sec.
WaveformPure Sinusoidal
Total harmonic Distortion (ThDv)
at Linear Load< 3%
at Non-Linear Load< 7%
Crest Factor 3 : 1 (1 second)
Nominal Output Frequency
While synchronized with the line50 Hz / 60 Hz ±2%
While not synchronized with the line50 Hz / 60 Hz ± 0.1%
Switching Frequency16 Khz.
Short-circuit behaviour:3 x Nominal Output Current
ProtectionShort Circuit Protection, Over Voltage Protection, Under Voltage Protection, Over Current Protection and Over Temperature Protection
Front Panel IndicatiorsInverter not Synchronized, Inverter DC Input High/Low, Bypass Out of Limit, Battery Fuse OFF, Bypass MCB OFF, DC Input MCB OFF, Inverter Overload, Internal Overtemperature, Inverter Failure, IGBT SCR Fuse Failure, Bypass Overtemperature Failure, Inverter Output High / Low, Inverter Overtemperature
Front Panel Set MenuUPS Mode (UPS, ECO, Bypass Inhibit), DC Cut off, Low Battery Level, Output Voltage Adjustment, Set Output Frequency, Auto Start ON/OFF, Date, Alarm Sound ON/OFF, Password
Alarm Contacts (1 Open 1 Closed)Inverter Failure, Overtemperature, Load on Bypass / Inverter, Inverter not Synchronized, DC Input Low /High, Battery Fuse OFF, Bypass out of Limit, Inverter Overload
Communication (OPTIONAL)RS 485 / RS 232 / Ethernet Ports, Remote PC Control, Modbus, Profibus, SNMP, DNP 3.0 Protocols and TCP/IP options
Paralleling (OPTIONAL)Parallel Redundancy
Topology Uninterruptible static switch with back-feed protection
Bypass System No break semiconductor thyristor – thyristor
Isolation Transformer (OPTIONAL)Galvanically Isolated
Nominal Frequency50/60 Hz ± 2%
Inverter/Bypass transfer time
Inverter failureMax. 5 msec.
Overload or manual transfer0 msec.
Bypass/Inverter transfer time 0 msec.
Efficiency >99%
Topology Make before break mechanical switch with locking system (OPTIONAL:External By-Pass Switch)
Over Voltage ProtectionIEEE 587 4500 A, 110 Joules (standard) / 40kA Surge Arrestor (OPTIONAL)
Electrical Interference Reduction FCC Part 15 Class B
Electrical StandardsIEC 62040-3 (Performance), EN 50091-1 (Security) / EN 50091-2 (EMC)
Protection Level / Color IP 20 / RAL 7035 (Standard), (Higher IP rating and different colors are available, please consult)
MTBF 100,000 hrs. (w/out battery group)
Enclosure Material Mild Steel, Zinc-phosphate coated; 100 µm electrostatic paint; 1.5 mm thickness
Cooling Forced Fan (Standard) / Natural (OPTIONAL)
Cable Entry Bottom (Standard) / Top (OPTIONAL)
Heater & LightningOPTIONAL
Operating Temperature -10 / +40 °C. (Higher operating temperatures are available, please consult)
Relative humidity 5 – 90 %
Operating Altitude Max. 1000 Mt. (Higher altitudes requires de-rating, please consult )
Noise Level Max. 60 db

Ripple on DC

AC Ripple at full load < 1%: Battery life is extended significantly via low ripple voltage due to low heat generation duing battery charge

Soft Start Feature

Output voltage is increased step by step, so no inrush current at start up

Dynamic Response in DC Bus

Output at 0 - 100 % load change

Output at 100 - 0 % load change

In sudden load changes dynamic response recovery time is 300 msec and max. voltage change is 5%

Dynamic Response at Output

Output at 0 - 100 % load change

Output at 100 %-0 load change

In sudden load changes dynamic response recovery time is 200 msec and max. voltage change is 10%

Switching wave form

By high frequency switching, there is no waveform distortion for reactive and nonlinear loads and audible noise is very low

Waveforms for Linear and Non-Linear Loads

Line voltage

Output waveform

Perfect output waveform with linear loads

Line voltage

Output waveform

Perfect output waveform with non-linear loads

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