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  • Battery Life Cycle Expectations?
    UPS Battery Life cycle expectations can vary dramatically, especially when used in a UPS System. The battery manufacturer will always state the expected life of a battery block on the proviso that it has a pure DC float voltage applied to it and that the...
  • UPS Components Can Fail – Why?
    UPS components can and do fail why? How does that happen? An uninterruptible power supply ( UPS) is a complex electronic device with a number of components that deteriorate with age and use. It is therefore in the client’s interest to have regular maintenance carried...
  • What Are Standby Generators?
    Often referred to as ‘backup generators’ or ‘emergency power systems’, Standby Generators are commonly used by hospitals and key government buildings to provide replacement power when the National Grid supply fails. These power failures are far more common than ever before. Generators may be gas...
  • What are EPO Operations?
    EPO (Emergency Power Off): this feature on UPS systems can cause many problems to the smooth running of the power protection installation. The primary reason for having this feature is to enable the UPS system to be ‘made safe’ in the event of an emergency....
  • What are Environmental Conditions for an Uninterruptible Power Supply (UPS)?
    Heat All UPS manufacturers will quote a maximum operating temperature for their equipment (typically +40C). The air conditioning plant must have sufficient capacity to maintain the conditions stated.  Obviously the overall efficiency of the UPS will have a significant effect on both the size and...
  • What are Diesel Generators?
    We have to thank Rudolf Diesel, who issued a patent for a proposed engine back in 1892, for this radical form of power plant. He eventually got the patent approved in 1898. His aim was to provide a convenient mobile internal combustion engine that would...
  • What are Bypass Switch Operating Instructions for a typical Rackmount UPS System?
    Bypass switch must not to be operated if the UPS is in ‘Battery Mode’! TO OPERATE BYPASS:- Before proceeding speak with your UPS supplier and one of their engineers, as the exact procedure varies from UPS to UPS. Switch UPS into static bypass (often pressing...
  • What are Automatic Mains Transfer Panels?
    The most common use of the Automatic Mains Transfer Panel is to switch the source of mains supply for UPS systems between the utility mains supply and a Standby Diesel Generator supply. Under normal circumstances the UPS system will derive its supply from the utility...
  • Uninterruptible Power Supply (UPS) Systems – What is THDi ?
    THD is Total Harmonic Distortion (THD): THD% = (rms value of all harmoics) / (rms value of the fundamental)  in % THDI where I stands for current. THDU where U stands for voltage To eliminate the harmonic currents, UPS’s are equipped with either an input...
  • Uninterruptible Power Supply (UPS) Systems – How UPS SNMP works?
    SNMP – stands for Simple Network Management Protocol. SNMP allows either one or a number of UPS systems to be monitored by a computer at a central point on a network. The severity and sensitivity of any alarms can be programmed to alert maintenance personnel direct....
  • Uninterruptible Power Supply (UPS) Systems – What use is a transformer in a UPS ?
    There is an historical connection with the use of transformers in a UPS system, due to the type of switching devices available to generate the output waveform. Until recently all large UPS systems had a transformer which increased their size and weight. Why do PowerContinuity...
  • Uninterruptible Power Supply (UPS) Systems – What is the heat output of a UPS ?
    Uninterruptible power supplies are part of an electrical circuit. Whenever current is either switched or transmitted through a cable or other material, heat is generated through power loss. Taking a very simple example, if 100A is passed through a cable that has a resistance of...
  • Uninterruptible Power Supply (UPS) Systems – What is a transformerless UPS ?
    To achieve the desired output power requirement, Uninterruptible Power Supplies (UPS) have relied on low voltage/high current capacity switching devices such as transistors and early MOSFETs and IGBTs. These devices were also relatively low speed when used in switching applications, and the use of transformers...
  • Uninterruptible Power Supply (UPS) Systems – Planning an IT Comms Room(s)
    Uninterruptible Power Supplies are highly sensitive electronic systems which both generate their own heat as well as being adversely affected by ambient heat. Uninterruptible Power Supplies are severely effected by moisture and damp. In effect, unless you carefully plan and execute a monitored environment for...
  • Uninterruptible Power Supply (UPS) Power Solutions – What Are They?
    UPS power solutions are required whenever aberration of the utility mains supply will result in problems occurring, whether it is loss of data on a server or the failure of life-support equipment. It does not have to be an interruption to the utility mains supply;...