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Download 9 Power Problems and Their UPS Solutions Power UPS Problem
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powerware.com/avaya 9 Power Problems and Their UPS Solutions Normal Sine Wave Power UPS Problem Solution Definition Cause and Results (1) Power Outage A total loss of utility power Can be caused by a number of events: lightning Standby strikes, downed power lines, grid over-demands, Line-interactive accidents and natural disasters. Online (2) Power Sag Short term low voltage Triggered by the startup of large loads, utility Standby switching, utility equipment failure, lightning Line-interactive and power service that’s too small for the Online demand. In addition to the crashes, sags can damage hardware. (3) Power Surge Short term high voltage With voltages above 110% of nominal, surges Standby can be triggered by a rapid reduction in power Line-interactive loads, heavy equipment being turned off, or by Online utility switching. The results can potentially damage hardware. (4) Brownout Reduced line voltage for Can be caused by intentional utility voltage Line-interactive extended periods of a few reduction to conserve power during peak demand Online minutes to a few days periods or other heavy loads that exceed supply capacity. (5) Electrical High frequency waveform Can be caused by either RFI or EMI interference Line-interactive Line Noise that piggybacks on the line generated by transmitters, welding devices, SCR Online waveform driven printers, lightning, etc. (6) High Voltage Instant and dramatic Can be caused by lightning strikes and can send Online Spike increase in line voltage line voltages to levels in excess of 6,000 volts. A spike almost always results in data loss or hardware damage to unprotected systems. Version 15, 10/07 (7) Frequency A change in frequency Variation stability Resulting from generator or small co-generation Online sites being loaded and unloaded. Frequency variations can cause erratic operation, data loss, system crashes and equipment damage. (8) Switching Transient Normal duration is shorter than a spike and generally falls in the range of nanoseconds. Instantaneous high voltage increase impressed on the power line waveform (9) Harmonic Distortion of the normal Distortion line waveform, generally transmitted by nonlinear loads. Online Switch-mode power supplies, variable speed Online motors and drives, copiers and fax machines are examples of nonlinear loads. Harmonic distortion can cause communication errors, overheating and hardware damage.
