ABB REF620E_F NBFNAAAANDA1BNN1XF Feeder protection device relay

Description

REF620E_F If the module is installed on an I/O Terminal Block with Barrier Terminals, an Auxiliary Terminal

Block can be used to provide additional wiring terminals. For the I/O Terminal Block with Wire to

Board Connectors, external connection points are usually be preferred, although an Auxiliary

Terminal Block can be used.

REF620E_F Auxiliary Terminal Blocks have all terminals connected together internally. The Auxiliary

Terminal Block with box terminals has 13 terminals, each of which accommodates one AWG #14

(avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire, or two wires up to

AWG #18 (avg. 0.86mm2 cross section). The Auxiliary Terminal Block with barrier terminals has

nine terminals, REF620E_F each of which can accommodate one or two wires up to AWG #14 (avg 2.1mm2

cross section).

The following illustration shows how an Auxiliary Terminal Block with Box Terminals can be

used for power connections to an I/O Terminal Block with Box Terminals.

The module receives power from the Bus Interface Unity for its own operation. An external

48VDC supply is needed to power the input devices.

LEDs

Individual LEDs (logic side), visible through the transparent portion of the module top, indicate the

on/off status of each input. The PWR LED is on when field and backplane power are present.

Host Interface

Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in the

system. This includes configuring features such as input defaults and fault reporting. The module

has 16 bits (two bytes) of discrete input data. A Bus Interface Unit is required to provide this input

data to the host and/or local processor.

REF620E_F A network of resistors, capacitors, and zener diodes establishes input thresholds and provides input

filtering. Optoisolators provide isolation between the field inputs and the module’s logic

components. An oscillator and switch form a sampling circuit that is transparent to the controller

and the LEDs that indicate the state of the inputs. Data from all 16 inputs is placed into a data

buffer. The module’s circuit LEDs show the current states of the 16 inputs in this data buffer.

Parallel?to?serial converters change input data from the data buffer into the serial format needed by

the Bus Interface Unit.

REF620E_F After checking the Board ID and verifying that the module is receiving appropriate logic power

from the Bus Interface Unit (which is reflected by the state of the module’s Power LED), the Bus

Interface Module then reads the filtered, converted input data.

Inputs for this module can be either positive or negative inputs (all 16 inputs must be the same

type). Both types of signal produce a logic 1 (true) when the switch is closed. Selection of positive

or negative operation is made by the manner in which the external power supply is connected to the

inputs and to the I/O Terminal Block.

Positive inputs receive current from input devices and supply current to the common or negative

power bus. Input devices are connected between the positive power bus and the input terminals.

Negative inputs provide current to input devices and accept current from the common or positive

power bus. Input devices are connected between the negative power bus and the input terminal.

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