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From Polychromatic
Charger : in a number of UPS systems because of the character of their design a separate battery charger is used, this is more common on sub 60kVA UPS systems and is quite common on small sub 3kVA items.
Battery : this is the power storage section and is kept charged eith...
Rectifier : this element of the UPS converts the incoming alternating current (ac) supply to direct current (dc) and can offer charging current for the battery and also the supply requirements for the inverter.
Charger : in numerous UPS systems as a result of character of their design a different battery charger is used, this is very common on small sub 3kVA items and is more common on sub 60kVA UPS systems.
Battery : this is actually the energy storage area and is kept charged possibly by the rectifier or even a separate charger. Its storage capacity is usually displayed, as AH (ampere hour), which will be the number of amperes of current that the battery can supply for an hour. There will be an amount of limiting factors dependant on the application, typically if the design calls for a small autonomy (period of time the battery will support its load for), the batteries could be discharged to a level, in the case of emergency lighting where there is a requirement for a autonomy the battery will not be permitted to discharge so far. These conditions help permit the optimum design life of the battery to be performed.
Inverter : this element of the Uninterruptible power supply offers an ac output to the load which is in phase with the input mains supply. Due to the number of conversions (ac to dc to ac) and the selection involved it may be termed as a 'clean source.'
Fixed Switch : this signal is as simple as a relay or more generally using thyristors, its purpose is always to switch the load between the inverter and the energy mains supply. To ensure that any switching involving the two will undoubtedly be almost seamless as has been earlier mentioned the output of the inverter is in phase with the power mains source. This design means that if the inverter experiences an overload situation, because of its very quickly over-current recognition tracks it will transfer the strain to the more sturdy mains supply. An average example would be each time a machine stand is switched on, the inrush current, based upon the size of your uninterruptible power supplies, may cause the transfer to the application mains offer, and after switched on the load can transfer back to the inverter providing the inverter has sufficient capacity to support the load. Also a fault on the inverter can cause the load to be transferred, again nearly seamlessly; it'd be unusual for any loss in load that occurs during these conditions.
Preservation Bypass : more on average found in UPS systems with a capacity of 6kVA or greater. The load is allowed by this arrangement to be moved under controlled conditions to the utility mains and the UPS to be shut down without loss. Normally carried out for program UPS preservation or UPS restore.
External Maintenance Bypass : the installation of an maintenance bypass can allow the UPS to be removed/replaced without disturbance to the load, also, if the actual maintenance bypass is fed from a separate source it can allow load screening in the case of a significant UPS restoration and/or checking of the independence under simulated load circumstances while the site load is being recognized by the external maintenance bypass circuit. When allowing the UPS System to be bypassed onto standby diesel generator power this is used. As an alternative, when batteries are removed and changed, it may only be done by setting the uniterruptible power supply into external bypass.
