Relay Output Module; Contact Input Module; Microprocessor Module - ABB REL 356 Instruction Booklet

Relay Output Module

There are three versions of this module (they are installed on the Interconnect module):
Version Function
Option 4 trip (form A), 4 BFI contacts (form A)
Base 1 2 trip (form A), 2 BFI (form A), 2 RB (form A), 1 GS contacts (form A)
Base 2 4 RI (form A), 2 Trip Alarm (form A), 1 Failure Alarm (form B)
The Channel Alarm output is provided on the Interconnect Module.
The Option version is used for extended contact output

Contact Input Module

This module provides an opto-isolated interface between:
• Contact inputs contaminated by external noise, and logic level inputs to the Microprocessor module
Voltage selection is made by jumper positions JM3 to JMP9:
Position Rated Voltage
(1 – 2) 48/60 Vdc
(3 – 4) 110/125 Vdc
(5 – 6) 220/250 Vdc
The inputs will de-assert at 67% of the higher rated voltage. For example, for jumper position (3 – 4), the input will
drop out when the voltage goes below 125 x 67% = 83.8 V.

Microprocessor Module

This module contains two processor systems (connected via the Dual Port RAM), which perform two main functions:
• Processor 1 samples the analog inputs and provides the operator interface
• Processor 2 is the protection processor
Each processor system (P1 and P2) contains the following elements:
• Microprocessor — 16 bit microcontroller (Intel 80C196) operating at 12 MHz.
• EPROM — an ultraviolet erasable read-only memory for program storage.
• RAM — a read-write, static, random access volatile memory for performing data storage.
Processor 1 (P1) has access to:
• EEPROM — electrically erasable, read-write non-volatile memory for settings and fault-data storage.
• Real-Time Clock — is accessed by Processor 1, to time-stamp the events.
The microprocessor module has a jumper for enabling contact output test, JM1. To enable test, set JM1 in position (1 –
2). To disable contact output test, set JM1 in position (2 – 3). After performing a contact output test, JM1 should be
returned to its original position, (2 – 3). This will prevent accidental contact operation when the TEST function is enabled
from the front panel.
The front panel has an automatic display saver feature. This feature is factory set to ENABLED by JM2 in position (2 –
3). The display saver feature can be turned off by setting JM2 in position (1 – 2).
Installation, Operation and Maintenance
ABB REL 356 Current Differential Protection
Connector
JB1
JB2
JB3
2-3