ABB SD833 3BSC610066R1 Bailey power module industrial control system

Description

SD833 The power for the module itself comes from the power supply in the Bus Interface Unit. An

external source of DC power must be provided for the switches that power the loads. Within the

module, the external power supply is connected to a 10 Amp fuse. During operation, the module

monitors this power to be sure it is above 4.2 VDC. If not, it is interpreted as a fault by the Bus

Interface Unit.

LEDs

Individual LEDs (logic side), SD833 visible through the transparent portion of the module top, indicate the

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

the module fuse is not blown.

Host Interface

SD833 Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in the

system. This includes configuring features such as output default and fault reporting. The module

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

data from the host and/or local processor.

SD833 After checking the Board ID and verifying that the module is receiving appropriate logic power

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

Interface Unit then sends output data to the module in serial format. During transmission, the

module automatically loops this data back to the Bus Interface Unit for verification.

Serial to parallel converters convert this data into the parallel format needed by the module. Opto

isolators isolate the module’s logic components from field outputs. Power from the external power

supply is used to drive the FETs that source current to the loads.

The module’s 10 Amp fuse protects outputs SD833 against the effects of polarity reversal of the external

power supply or excessive current through the output points. If incorrect connection of the power

supply blows the fuse, it is indicated by the module’s PWR LED. In addition, the module provides a

Blown Fuse diagnostic message to the BIU. IF the fuse blows, disconnect power, remove the

module and replace the fuse. CAUTION: Electrostatic discharge can damage the module when it is

not installed on an I/O Terminal Block. Always observe normal ESD protection practices when

handling an un-installed module.

Fuse location is shown below. Pry the fuse upward to remove it, taking care not to damage any

SD833 components in the module. Place the new fuse in position and press it into the holder.

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