Rockwell-automation 1405-M620 Operating Instructions Uživatelský manuál stáhnout pdf (Strana 6)

Publication 1405-IN002C-EN-P - November 2004

6 Bulletin 1405 (M620) Operating Instructions

displayed is instantaneous phase currents, while the additional

parameters are time-averaged phase currents and peak phase currents.

For power measurements, the main parameters displayed are real

power for each phase. The additional parameters in this group are

apparent power of each phase, total real and apparent power, and

3-phase power factor. When the instrument is displaying the main

parameter of a group, the additional parameters within that group can

be scrolled using the “F” key.

Measurement Modes

The functions of the instrument are accessed as follows:

Table 2

Key Function

Indication

Key Press

Duration

“+” Skip to the next measured parameter Short

Auto-sequencing display mode: enable /

disable

- “r” Long

Re-set average and peak values - “c” Very long

“F” Sequentially display one parameter type: e.g.,

current

Short

Enter set-up mode Very long

“-“ Go back to the previous displayed parameter

The instrument measures voltage and current for each of three phases

in an alternating sequence of 2 seconds each. This corresponds to the

integrating time of the A/D converter circuits. At the same time, the

values of power, power factor (Cos f), and energy consumption are

computed. The energy value is computed for each phase over the

integration period, and the accumulated values are stored in memory.

The measured voltage values are continuously evaluated for over- and

under-voltage occurrences, and the energy transfer rate is converted

to an output pulse rate. Voltage limit alarms and energy unit pulses

are transmitted by relay contacts.

In the auto-sequencing displayed mode, the displayed parameter

change every 6 seconds. The user can halt the auto-sequencing of

displayed parameters, so that one desired parameter is displayed

continuously. Independent of the sequencing mode, the measured

values are updated and displayed in 2-second intervals.

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Rockwell-automation 1405-M620 Operating Instructions Uživatelský manuál Strana 6