ABB UNITROL1010 3BHE035301R0004 Compact and powerful

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.

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.

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