Rockwell Automation 1405-M620 Operating Instructions - Manual (Page 8)

Publication 1405-IN002C-EN-P - November 2004
8 Bulletin 1405 (M620) Operating Instructions
Auto-Sequencing Display Mode
In this display mode, the instrument automatically switches the
displayed values from one parameter group to the next, at intervals of
6 seconds, cycling continuously through all 6 parameter groups.
Any of the additional parameters can be selected instead of the main
parameter. Thereafter only the selected additional parameter will be
displayed when the turn of that parameter group comes up during
display sequencing. For example, if time-averaged phase currents are
selected in the current (I) parameter group, only these values will be
displayed when it is the turn of this group during auto-sequencing.
Irrespective of the specific parameter selected for display within each
group, the total period of the display cycle for the 6 parameter groups
remains constant.
Line-to-neutral voltages and line-to-line voltages are treated as
separate parameter groups, so that both these parameters are always
displayed during auto-sequencing.
Examples of all the parameter displays, and parameters grouping, are
illustrated on the next page.
Analog Outputs The M620 is also available with six analog retransmission outputs.
These outputs can be user programmed for 0-20 mA or 4-20 mA, and
assigned to any of the measured power-line measured variables.
These outputs are electrically isolated from the rest of the instrument’s
circuits. Each output has a positive polarity. A common return line at 0
V potential is used for all analog outputs. Each output can drive a load
of up to 250 ohms, with output voltage of up to 5V dc. These outputs
may be connected in parallel.
Configure the analog outputs during instrument setup. The following
key sequences and indications apply during setup.
The “-” key scrolls through the parameters that may be assigned as a
0 to 20 mA output:
V Voltage P-P
n Voltage P-N
I Current instantaneous
= Current time average
P real power
S apparent power
C cos phi (power factor)