Basler Electric BE1-79A - Manual (Page 23)

9310200990 Rev J BE1-79A Functional Description 3-1
SECTION 3 • FUNCTIONAL DESCRIPTION
Introduction
BE1-79A relays are microprocessor-based devices that provide automatic reclosing of circuit breakers.
This section describes the hardware, circuitry, and software of the BE1-79A.
Hardware
The BE1-79A is supplied as an S1 cradle and case (200 series) or an S2 cradle without a case (100
series).
100 Series Description
The BE1-79A-100 and –101 consist of a draw-out cradle assembly that is intended for installation in an
existing S2 case. A case is not provided with the cradle assembly.
200 Series Description
The BE1-79A-200 and –201 consist of a draw-out cradle assembly with a steel and phenolic case. The
case has the same overall dimensions as a Basler Electric or General Electric S1 case.
Circuit Operation
This description of circuit operation is divided into Inputs, Microprocessor, and Outputs. BE1-79A circuit
functions are illustrated in Figure 3-1 and described in the following paragraphs.
Figure 3-1. Function Block Diagram
Inputs
The four types of BE1-79A inputs are:
•
Operating power
• Contact sensing inputs
• Reset switch
• Serial communication port
V1
V3
V2
V4
V5
MICROPROCESSOR
C1 C3 C5 C7 C9
ISO
ISO
ISO
ISO
ISO
EEPROM
Settings and Status
Memory
RAM
Operating
Memory
ROM
Program
Memory
AC/DC
Power
Reset
Watchdog
Timer Circuit
Power Supply
RS-232
LED
Indicators
D2588-04
08-17-05
C2 C4 C6 C10
C8
S5