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Overvoltage
The supply voltage is exceeded by more than +6% for a prolonged period (acc. to IEC 60038)
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Approx. 15% - 20%
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Can result in overheating and even thermal destruction of individual components. Causes total failure.
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SITOP power supplies with their wide operating voltage range offer sufficient protection against minor network overvoltages outside the permissible tolerance
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Line undervoltage
The supply voltage is undershot by more than -10% for a prolonged period (acc. to IEC 60038)
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Approx. 20% - 30%
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Can result in undefined operating states of loads. Causes data errors.
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Use of a SITOP DC UPS (uninterruptible DC power supply)
see Section 11
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Interference pulses
Energy-rich pulses (e.g. 700 V/1 ms) and energy-poor transients (e.g. 2500 V/20 µs) result from switching operations in the supply system
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Approx. 30% - 35%
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Can result in undefined operating states of the loads and can lead to the destruction of components.
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For use of overvoltage protection devices, see Catalog LV 10.1 2020, Section 6
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Voltage dips and surges
The voltage level changes suddenly and in an uncontrolled manner, e.g. due to changes in loading and long cable routes
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Approx. 15% - 30%
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Can result in undefined operating states and destruction of components. Cause data errors.
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Thanks to their internal buffer time, SITOP power supplies offer sufficient protection against short power failures
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Electrical noise
A mix of frequencies superimposed on the mains due to bad grounding and/or strong HF emitters
such as radio transmitters or thunderstorms
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Approx. 20% - 35%
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Can result in undefined operating states of loads. Causes data errors.
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Due to internal switching measures, SITOP power supplies offer sufficient immunity to electromagnetic interference
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Voltage interruption
Short-term interruption of the supply voltage (up to approx. 100 ms) due to short-circuiting in neighboring supply systems or starting of large electrical machines.
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Approx. 8% - 10%
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Can result in undefined operating states of loads, especially those with insufficient mains buffering. Causes data errors.
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Use of a SITOP buffer module (in connection with SITOP smart or SITOP modular)
see Section 10
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Voltage interruption
Long interruption of the supply voltage (longer than approx. 100 ms)
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Approx. 2% - 5%
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Can result in undefined operating states of loads, especially those with insufficient mains buffering. Causes data errors.
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Use of a SITOP DC UPS (uninterruptible DC power supply)
see Section 11
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