Beckhoff PS3031-2440-0000, Документация

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Foreword
PS3031-2440-0000 9 Version: 1.0
2.3 Terminology and abbreviations
PE and the earthing
symbol PE is the abbreviation for "protective earth" and has the same meaning as the
earthing symbol
Earth, ground The terms earth and ground are synonymous and are used interchangeably in this
document.
T.b.d. Still to be defined, value or description will follow in due course.
AC 400 V A value preceded by "AC" or "DC" represents a nominal voltage or a nominal
voltage range. The nominal voltage or the nominal voltage range may be provided
with tolerances. (e.g., AC 380 - 480 V ±15%). The calculated total range then
indicates the working range of the device.
Example:
DC 12 V refers to a 12 V battery, regardless of whether it is fully charged
(13.7 Vdc) or discharged (10 Vdc).
400 Vac A value followed by the unit Vac or Vdc is an instantaneous value that does not
contain any additional tolerances.
50 Hz vs. 60 Hz Unless otherwise specified, AC 230 V parameters are valid at a mains frequency of
50 Hz.
may A keyword indicating a choice without implied preference.
shall A keyword indicating a mandatory requirement.
should A keyword indicating a choice with a clearly preferred method of implementation.