Overvoltage

The supply voltage is exceeded by more than +6% for a prolonged period (acc. to IEC 60038)

Approx. 15% - 20%

Can result in overheating and even thermal destruction of individual components. Causes total failure.

SITOP power supplies with their wide operating voltage range offer sufficient protection against minor network overvoltages outside the permissible tolerance

Line undervoltage

The supply voltage is undershot by more than –10% for a prolonged period (acc. to DIN IEC 60038)

Approx. 20% - 30%

Can result in undefined operating states of loads. Causes data errors.

Use of a SITOP DC-UPS (uninterruptible DC power supply)
see Section 11

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

Approx. 30% - 35%

Can result in undefined operating states of the loads and can lead to the destruction of components.

Use of surge protectors, see Catalog LV 10.1 2013, Section 6

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

Approx. 15% - 30%

Can result in undefined operating states and destruction of components. Cause data errors.

Thanks to their internal buffer time, SITOP power supplies offer sufficient protection against short power failures

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

Approx. 20% - 35%

Can result in undefined operating states of loads. Causes data errors.

Due to internal switching measures, SITOP power supplies offer sufficient immunity to electromagnetic interference

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.

Approx. 8% - 10%

Can result in undefined operating states of loads, especially those with insufficient mains buffering. Causes data errors.

Use of a SITOP buffer module (in connection with SITOP smart or SITOP modular)
see Section 10

Voltage interruption

Long interruption of the supply voltage (longer than approx. 100 ms)

Approx. 2% - 5%

Can result in undefined operating states of loads, especially those with insufficient mains buffering. Causes data errors.

Use of a SITOP DC-UPS (uninterruptible DC power supply)
see Section 11