Technical Description
Functional description
Functions of the machine terminal
The functions of REM 54_ machine terminal are categorized as:
• protection functions
• measurement functions
• control functions
• condition monitoring functions
• communication functions
• general functions
• standard functions
The functions are further divided to two subsets that correspond to different
functionality levels (refer to section “Ordering Information” on page 91).
Protection functions
Protection is one of the most important functions of the machine terminal. The
protection function blocks (e.g. NOC3Low) are independent of each other and have
their own setting groups, data recording, etc. The non-directional overcurrent
protection, for example, includes the three stages NOC3Low, NOC3High and
NOC3Inst, each with independent protection functions.
Either Rogowski coils or conventional current transformers can be used for
protection functions based on current measurement (overcurrent). Correspondingly,
voltage dividers or voltage transformers are used for protection functions based on
voltage measurement (overvoltage).
The protection function blocks are documented on the CD-ROM Technical Descriptions of Functions.
Although warning hazards are related to personal injury, it is necessary to understand
that under certain operational conditions, operation of damaged equipment may result
in degraded process performance leading to personal injury or death. Therefore,
comply fully with all warning and caution notices.
Document conventions
A particular convention may not be used in this manual.
• Abbreviations and acronyms are spelled out in the glossary. The glossary also
contains definitions of important terms.
• Parameter names are shown in italics.
The function can be enabled and disabled with the Operation setting.
• Parameter values are indicated with quotation marks.
The corresponding parameter values are "On" and "Off".
• Input/output messages and monitored data names are shown in Courier font.
The installation manual contains instructions on how to install the mounting assembly
with pre-wired terminals. The manual provides procedures for mechanical and electrical installation.
The chapters are organized in chronological order in which REX521RRP should be installed.
Cutting tool safety guide contains safety recommendations to the user.
Cutting tool operating guide illustrates how the cutting tool is prepared for operation.
The guide contains instructions on how to operate the tool during relay retrofit.
Relay Retrofit Program for REX 521 Product Guide 1MRS758962
Relay Retrofit Program for REX 521 Installation Manual 1MRS758961
Relay Retrofit Program for REX 521 Application Manual 1MRS758960
Relay Retrofit Program for REX 521 Cutting Tool Safety Guide 1MRS758975
Relay Retrofit Program for REX 521 Cutting Tool Operating Guide 1MRS758976
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