Siemens SICAM Q80 Operating Instruction page 39

Power quality recorder

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Connections and Conditioning

E-39

Example for a digital output with switched voltage and pull-down resistor

The measurement device offers no internal reference voltage. That has to be connected externally.

Note

The standard 61000-4-30 requires processing over a span of 10 (for 50 Hz) or 12 periods

(for 60 Hz). By this means, voltage events at this distance (200 ms) are also tested and

signaled by the DO (digital output).

If a brief voltage dip begins and ends within this processing period, the DO does transmit

this, but after a delay. If the voltage dip begins in one cycle and ends in the next, the

event is indicated by the DO. The signal output lasts at least 200 ms.

In the worst case, the output by the DO is delayed by ca. 300ms. This delay depends on:

the network frequency, the measurement channel and the demands on the measurement

device.

Power Quality Recorder SICAM Q80 7KG8080, Operating instruction

E50417-B1074-C419-A2, Release 12.01.2015

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