ABB REM543CM216AAA Machine protection terminal REM 545

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.

Control functions

The control functions are used to indicate the status of switching devices, 

i.e. circuit breakers and disconnectors, and to execute open and close commands for controllable switching devices of the switchgear. 

Furthermore, there are supplementary functions for control logic purposes, e.g. on/off switches, 

MIMIC alarm LED control, numerical data for MIMIC and logic controlled control position selector. 

The control functions configured with the Relay Configuration Tool can be associated with object status indicators that 

are part of the MIMIC configuration picture displayed on the HMI. 

The object status indicators are used to indicate the status of switching devices via the MIMIC picture and to control them locally.

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).

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