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Charger : in a number of UPS systems as a result of character of their design a different battery charger is used, this is more common on sub 60kVA UPS systems and is very common on small sub 3kVA models.

Battery : this is the power storage section and is kept charged eith...

Rectifier : this part of the UPS converts the incoming alternating current (ac) supply to direct current (dc) and provides charging current for the battery and also the supply needs for the inverter.

Charger : in a number of UPS systems because of the nature of the design another battery charger is applied, this is more common on sub 60kVA UPS systems and is very common on small sub 3kVA devices.

Battery : this is the energy storage section and is kept charged both by the rectifier or a separate charger. As AH (ampere hour), which is the number of amperes of current that the battery can supply for an hour, their storage capacity is normally displayed. There will be a quantity of limiting factors based upon the application, generally if the design calls for a short autonomy (amount of time the battery will support its weight for), the batteries may be released to a level, in the case of emergency lighting where there is a need for a autonomy the battery will not be allowed to discharge so far. These circumstances help permit the maximum design life of the battery to be achieved.

Inverter : an ac output is provided by this section of the Uninterruptible power supply to the load that is in phase with the input mains supply. Due to the number of conversions (ac to dc to ac) and the filter involved it can be known as a 'clean source.'

Fixed Switch : this circuit is often as simple as a relay or even more frequently using thyristors, its goal would be to switch the load between the inverter and the power mains supply. As has been previously mentioned the production of the inverter is in phase with the utility mains source in order that any switching involving the two is going to be virtually seamless. This arrangement ensures that if the inverter experiences an overload condition, because fast over-current discovery circuits it will move the strain to the more sturdy mains supply. A typical example would be when a server tray is switched on, the inrush current, depending upon the size of one's uninterruptible power supplies, could cause the transfer to the utility mains offer, and once switched on the load will transfer back to the inverter giving the inverter has sufficient capacity to support the load. Also a problem on the inverter will cause the load to be transferred, again essentially seamlessly; it would be unusual for any lack of load that occurs over these circumstances.

Maintenance Bypass : more on average within UPS systems with a capacity of 6kVA or greater. This arrangement allows the load to be moved under controlled conditions to the utility mains and the UPS to be power down without damage. Generally carried out for routine UPS preservation or UPS restore.

External Maintenance Bypass : the installation of an maintenance bypass can allow the UPS to be removed/replaced without interruption to the load, also, if the actual maintenance bypass is fed from another supply it can allow load testing in the case of a significant UPS restoration and/or checking of the independence under simulated load conditions while the site load has been supported by the external maintenance bypass circuit. This is used when allowing the UPS System to be bypassed onto standby diesel generator power. Alternately, when batteries are replaced and removed, it may only be achieved by setting the uniterruptible power into additional bypass.

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