Industrial UPS Systems
Uninterruptible Power Supply (UPS) systems
An uninterruptible power supply (UPS) system provides power to a critical load when the input power source, typically the mains power fails. The true online UPS provides continuous protection from input power interruptions or surges by means of storage batteries and associated electronic circuitry.
The power conversion process isolates the critical load from the normal mains borne disturbances and similarly isolates the mains from load induced reflected harmonics affecting other loads connected to the input mains feeder.
The rectifier converts AC power into DC for charging a storage battery such as maintenance free lead acid, vented lead acid or Nickel Cadium, it also provides the necessary DC for the continously rated capacity of the inverter. IGBT semiconductor devices are used in our Pulse Width Modulation (PWM) inverters and the control logic creates the precise sinusoidal output waveform with a very low harmonic content.
The uninterruptible power sources are intended for use in the oil, gas, petrochemical and process engineering, power stations, aerospace, airports and defence type applications, where absolutely reliable power is demanded.
Modes of Operation
Normal
The rectifier converts normal input AC power into DC for the inverter and for charging the battery. The inverter is synchronised with the mains providing it is within the tolerances permitted by the logic, the inverter delivers its closely regulated frequency and voltage through the static switch to the load.
Where the reference frequency and voltage are outside the permitted limits, the inverter will 'uncouple' from the mains and will 'free run' using its internal oscillator to assure the high stability power for the load.
Loss of input power
In the event of input power failure, the inverter will operate from the battery until the low DC threshold is reached or the input power to the rectifier is restored.
When the input AC power to the rectifier is reinstated, the rectifier resumes the provision of DC for the inverter and it will simultaneously recharge the battery, feed the inverter and the connected critical load.
The critical load connected to the inverter will not be disturbed during the loss and restoration of the input AC power feeding the rectifier.
Bypass operation
The inverter is provided with a sensing circuit which can detect transient overload conditions, sustained overloads and short circuits. The sensing circuit initiates 'current limit' which causes the static switch of the inverter to transfer the critical load to the static bypass switch in the emergency alternate line without interruption to the load.
The bypass logic will automatically initate a retransfer of the load from the bypass alternate line, synchronised, without a break back to the inverter once the inverter and reference power source are within the predetermined limits.
Our UPS Systems deliver high stability power with low audible noise. They respond instantaneoulsy to non linear loads and transient load changes in high ambient temperatures in arduous, harsh environmental conditions.
Below is our current range of UPS Systems:
Custom Engineered Grade (CEG) UPS Systems
Custom engineered grade (CEG) sectional module design concept of industrial UPS systems and inverters, can be supplied with 120V DC, 240V DC or 400V DC battery bus voltages. This rugged and custom engineered grade product is provided with analogue multi function metering and separate power flow status and alarm mimic panel. The units are intended for active on-line installations between the power source and the critical load where the inverter delivers regulated voltage and frequency to the load at all times.
Outputs of 400V or other voltages are from 5kVA to 150kVA single phase with 230V or 120V, and three phase outputs from 10kVA to 400kVA 50Hz or 60Hz. This product can also be supplied for frequency conversion applications.
See more information about our CEG UPS Systems
E20 Series
A new microsprocessor control logic based product range providing high quality reliable power for the most critical applications. The systems benefit from an automatic input power factor correction and harmonic compensation technique built into the rectifier resulting in very low harmonic distortion reflected into the mains power source. Current consumption is optimised with a power factor of 0.99.
This industrial grade product is a True Active Online Double Conversion type UPS system with a high frequency pulse width modulation (PWM) inverter. The use of PWM inverters ensures exceptional high efficiency performance and extremely quiet operation.
The UPS systems have a galvanic isolation between the battery and the output, with optional galvanic isolation at the input. The isolation prevents the risk of the high voltage DC from damaging equipment connected to the UPS.
This E20 series is available with single phase input and single phase output up to 50kVA (E21), and three phase input and three phase output in sizes up to 200kVA (E23). The standard single phase output is 230V AC 50Hz and the standard three phase output is 400V AC 50Hz, however, virtually any voltage is achievable.
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RTC Series
Compact Rugged Transitor UPS Systems
This range of rugged transitor (RTC) uninterruptible power sources is designed with separated rectifier, inverter and bypass sections, whilst allowing for an integrated construction to make it compact format.
The UPS System can be manufactured in either single module and multi module parallel configuration with 6 pulse or 12 pulse rectifiers for installation in computer room or plant room.
The inverter design is a high frequency PWM type with shielded logic, output isolation transformer, static interrupter with static transfer and manual bypass switch, a status indicating and alarm mimic with digital metering is fitted as standard.
This product design has adopted the commercial standard DC bus voltage of 384 and can be used with all types of batteries, the VRLA batteries are supplied in enclosures to match the UPS enclosure. Available in sizes, 10kVA to 150kVA with single phase output and 10kVA to 350kVA with 3 phase output. The RTC range of products can also be supplied with 60Hz output or as frequency converters.
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Rack Mounting UPS Systems
These compact, ruggedised, seismically qualified discrete module section UPS Systems are designed for installation where space is limited and high security power is needed. For instance, for applications in process engineering, data logging, military bases, instrumentation, public utilities and telecommunications.
The rack mounting units are active-on-line UPS Systems featuring fully controlled rectifiers and transistor or IGBT PWM inverters which deliver continous conditioned power with high stability regulated frequency ans precise voltage for all types of critical loads.
See more information about our Rack Mounting UPS Systems.
