Symbols And Definitions - Eaton EMR-3MP0 Installation, Operation And Maintenance Manual

1 EMR‑3MP0 Motor Protection Relay
1.1 Comments on the Manual
1.1.2

Symbols and Definitions

Connection Diagram that is Printed on the Housing
There is a connection (wiring) diagram fixed onto the housing of the EMR-3MP0. This
diagram shows all terminals for this particular device variant.
A table of the symbols that can appear in this diagram can be found here:
for Wiring Diagrams"
Load Reference Arrow System
• It is common practice to either use the "Load Reference Arrow System" for loads
(consumed energy) or the "Generator Reference System" for generators (generated
energy).
• All E‑Series protection devices (except generator protection devices) use exclusively
the "Load Reference Arrow System". Generator protection devices are working
based on the "Generator Reference System".
• This applies to directions and phase angles. The phase angle is defined as the angle
between the current phasor and the voltage phasor.
• Current and voltage arrows are to be counted positive in the direction of the arrow.
Typographical Conventions
• »Parameters are indicated by right and left double arrow heads and written in italic.«
• »SIGNALS are indicated by right and left double arrow heads and small caps.«
• [Paths are indicated by brackets.]
• Software and Device names are written in italic.
• Module and Instance (Element) names are displayed italic and underlined.
• »Pushbuttons, Modes, and Menu entries are indicated by right and left double arrow
heads.«
• ①②③ Image References
Numbered Signals in Function Diagrams
The signals labeled by encircled numbers are meant to signify connections between
different diagrams. So, if you find such an encircled number somewhere "on the left side"
of a diagram you might want to look up in which other diagram this particular signal has
been generated.
Therefore all encircled numbers appearing "on the right side" (i. e. as an output signal) of
a diagram are listed as part of the Index chapter.
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EMR-3MP0