| Single UPS installation | | | | module from service either for repair or maintenance |
| As the description implies this represents a single | | | | without altering the integrity of the system. The added |
| uninterruptible power supply installation comprising of | | | | advantage is that the system with support an overload |
| the UPS and battery where the battery can be internal | | | | situation where redundancy is lost. |
| or external and consist of single or multiple strings. | | | | Parallel UPS Installation- Sharing the critical load |
| Multiple strings can increase the autonomy and also | | | | This installation consists of two or more, normally up to |
| provide greater security of load in the event of a utility | | | | a maximum of eight modules dependent upon UPS |
| mains failure. | | | | manufacturer, to support the load. The number of |
| It should be noted that when the load has been | | | | modules is designed to support the load and can be a |
| transferred to the maintenance bypass mode it would | | | | convenient method of installation where one module on |
| be unprotected in the event of a utility mains failure. | | | | its own may be too large to physically fit in the desired |
| Hot Standby UPS Installation | | | | location. Also, as in the parallel redundant installation, |
| This installation uses two UPS modules, referred to as | | | | providing the number of modules has not exceeded |
| a UPS System; one (A) is directly coupled to the load, | | | | the manufacturer's design requirements modules may |
| the output of the second (B) supplies the reserve input | | | | be added as the site load increases. |
| of A. Therefore if UPS A inverter fails the load is | | | | It should be noted that it is not possible to parallel all |
| switched to the inverter output of UPS B and is still | | | | types of UPS systems and that the individual modules |
| protected in the event of a utility mains failure. Equally | | | | need to be the same make, module and capacity and |
| either UPS can be switched to the maintenance | | | | will require additional circuitry to provide the parallel |
| bypass condition with no loss of protection to the load | | | | control. |
| in the event of a utility mains failure. This is used when | | | | Disaster Preventative installation |
| either the UPS or Generator power protection system | | | | This usually consists of a substantial UPS system |
| are serviced as part of a regular maintenance regime. | | | | backed by a diesel Generator |
| Parallel Redundant UPS Installation- N+1 | | | | Remember, PowerContinuity Means Business |
| This installation can consist of up to eight modules and | | | | Continuity. To ensure that failure is not an option, |
| can be complete with a static switch module. This type | | | | always take into consideration: is your power |
| of installation is designed to ensure that when fully | | | | protected? If not, what steps should I take to ensure |
| loaded there is sufficient capacity to remove one | | | | that it is? |