A load bank test is used to test the UPS and generator which is under load conditions to ensure that they are working optimally. This method is a way of validating the true operational performance as well as the battery autonomy used in UPS system. The main reason for testing load banks is to carry out preventative maintenance necessary to avoid future damages or breakdowns. In addition to preventative maintenance, load bank tests are used to ascertain the current conditions of UPS batteries as well as battery sets to show whether any of the cells are holding the charge, approaching the end of their working life or whether they are about to fail.
This facilitates their replacement before they cause a critical application problem. It is important to note that load bank test services are sometimes offered by suppliers of power protection equipment e.g. Uninterruptible Power Supplies Limited as a part of UPS commissioning process.
However, when carrying out this commissioning, caution should be exercised to ascertain reliable results and operations. Ideally, the testing services should be carried out at least after a week after the UPS has been commissioned. This is very vital because it not only permits the voltage across the battery but also allows the battery to be fully charged. You should understand that carrying out load bank tests before a week of commissioning would neither yield accurate results nor give you the true picture how the system is running. Therefore, this would be a waste of time and money that should be avoided.
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In case there is a standby generator, load bank testing will indicate:
- The ability of the engine to provide the power required.
- The capability of the alternator to provide the required voltage stability for the system.
- The efficiency of control systems under different conditions of the load.
- The stable frequency.
- The pressure of oil and fuel.
- Performance of the whole load bank system.
