Nine major power problems
Nine major power problems which, depending on the make and model can be corrected or protected against by using UPS power.
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Complete power loss:
No power available at all, equipment being powered will immediately shut down, depending on the equipment it may start up again when power returns or it may need manual intervention. -
Voltage has increased beyond expected tolerance;
equipment can suffer permanent failure of internal components or shut down. -
Voltage has dropped below expected tolerance;
equipment can suffer permanent failure of internal components or shut down. -
Power surge:
Voltage is momentarily increasing then dropping again. Equipment on this power may fail or work erratically. -
Power sag:
Voltage is momentarily decreasing then rising again. Equipment on this power may fail or work erratically. -
Frequency variation:
The frequency of the power is varying, it should be fixed at 50Hz. Some equipment has a wide tolerance for this but others can have their correct operation detrimentally affected. -
Harmonics distortions:
The power signal is distorted in its wave shape; it should be a pure sine wave. This can lead to reduced power and voltage and cause the equipment to malfunction or have failure of the internal components. -
Line noise:
High frequency noise on the power which is generally caused by other equipment being powered from it, often motors and other large machinery. This can cause erratic behaviour of the equipment. -
Switching transients:
These are sudden fast drops and rises in power caused by the power supply being switched. These will mostly be caused by the power supply companies switching circuits. These sudden changes can cause component failure or erratic behaviour of the equipment.