Basler BE1-79S User manual

INSTRUCTION MANUAL
FOR
SINGLE SHOT RECLOSING RELAY
BE1-79S
Publication Number: 9 1410 00 990
Revision: B 02/2001

BE1-79S Introduction i
WARNING
To avoid personal injury or equipment damage, only qualified personnel
should perform the procedures presented in this manual.
INTRODUCTION
This Instruction Manual provides information concerning the operation and installation of BE1-79S Single
Shot Reclosing Relay. To accomplish this, the following is provided.
!Specifications
!Installation
!Operational Tests
!Mounting Information

ii BE1- 79S Introduction
CONFIDENTIAL INFORMATION
OF BASLER ELECTRIC COMPANY, HIGHLAND, IL. IT IS LOANED FOR CONFIDENTIAL USE, SUBJECT
TO RETURN ON REQUEST, AND WITH THE MUTUAL UNDERSTANDING THAT IT WILL NOT BE USED IN
ANY MANNER DETRIMENTAL TO THE INTEREST OF BASLER ELECTRIC COMPANY.
First Printing: 1981
Printed in USA
© 1981, 1986, 1998, 2001 Basler Electric Co., Highland, IL 62249
February 2001
It is not the intention of this manual to cover all details and variations in equipment, nor does
this manual provide data for every possible contingency regarding installation or operation.
The availability and design of all features and options are subject to modification without
notice. Should further information be required, contact Basler Electric Company, Highland,
Illinois.
BASLER ELECTRIC
ROUTE 143, BOX 269
HIGHLAND, IL 62249 USA
http://www.basler.com, [email protected]
PHONE [phone] FAX [phone]

BE1-79S Introduction iii
CONTENTS
SECTION1 GENERALINFORMATION ........................................ 1-1
Purpose ....................................................... 1-1
Description ..................................................... 1-1
Model And Style Number .......................................... 1-2
SampleStyleNumber............................................. 1-2
Specifications ................................................... 1-3
SECTION 2 CIRCUITS ..................................................... 2-1
General ........................................................ 2-1
Power Supply ................................................... 2-2
Initiate Contact Sensing (RI) ........................................ 2-2
Breaker Open Sensing (52b) ....................................... 2-3
Cancel Contact Sensing (RC) ...................................... 2-3
Automatic Reclose Enable Logic .................................... 2-3
Reclose Timer .................................................. 2-3
Reclose Fail Timer ............................................... 2-3
Reset Timer .................................................... 2-3
Voltage Monitor ................................................. 2-4
Power Supply Output ............................................. 2-7
SECTION 3 HUMAN-MACHINE INTERFACE .................................... 3-1
Controls and Indicators ............................................ 3-1
Switches....................................................... 3-4
SECTION4 INSTALLATION ................................................. 4-1
Unpacking ..................................................... 4-1
Inspecting ...................................................... 4-1
Mounting ....................................................... 4-1
Connecting ..................................................... 4-1
Storing ........................................................ 4-2
SECTION5 OPERATIONALTEST ............................................ 5-1
General ........................................................ 5-1
Reclosing Relay Operational Test ................................... 5-1
Voltage Monitor Conditions, Modes, and Voltage Levels Selection .......... 5-6
SECTION 6 MAINTENANCE ................................................. 6-1
General ........................................................ 6-1
In-House Repair ................................................. 6-1
SECTION 7 MANUAL CHANGE INFORMATION ................................. 7-1
Changes ....................................................... 7-1

BE1-79S General Information 1-1
SECTION 1 • GENERAL INFORMATION
PURPOSE
The BE1-79S Single Shot Reclosing Relay is a solid-state device that provides automatic reclosure of circuit
breakers that have been tripped by a protective relay. Many faults are temporary and when a circuit breaker
has tripped, due to a protective system operation, it may be successfully reclosed after a short delay without
retripping. The BE1-79S Reclosing Relay will provide a single reclosure signal following a trip as an attempt
in restoring power and minimizing system disturbances.
DESCRIPTION
The Basler Electric Single Shot Reclosing Relay senses opening and closing of an associated circuit
breaker. If the reclosing relay has received a Reclose Initiate signal prior to the opening of the breaker, the
reclosing relay after a programmed interval will attempt to reclose the breaker. If the fault is not cleared, and
the breaker trips again, no further attempt is made by the reclosing relay to close the breaker. If reclosing
is successful and the breaker remains closed for a predetermined interval, the reclosing relay automatically
resets and is ready to attempt reclosing for a subsequent trip of the protected breaker.
The programmed time interval between breaker tripping and the reclosure attempt is continuously adjustable
by a front panel RECLOSE TIME control within three optional time ranges (0.1 to 2.0 seconds, 1.0 to 20
seconds, or 5 to 60 seconds).
A front panel RESET TIME control adjusts a reset timer in the relay over a range of 5 to 60 seconds. When
the reclosed breaker has remained closed over the reset interval, the reclosing relay will reset and provide
automatic reclosing for a subsequent protective trip. If the breaker trips before the expiration of the reset
interval, the reclosing relay will not attempt another reclosure. Resetting of the relay when this has occurred
requires closure of the breaker by other means and its remaining closed for the reset interval.
Automatic reclosing of a tripped breaker requires that a reclose initiate signal (RI) be generated by the
protective system and received by the reclosing relay prior to the breaker open signal (52b). The reclose
initiate feature allows the reclosing relay to distinguish between protective trips for which automatic reclosing
is required and those breaker operations for which automatic reclosing is not desirable. When this feature
is not required, the reclose initiate input may be connected to the system battery positive lead or relay ter-
minal 15*, depending on the specified contact sensing input type, to provide a permanent enable.
(*) This requires routing through the external sensing input module if the Type X power supply is used.
A reclose cancel signal (RC) may be applied to the reclosing relay to inhibit the reclosing operation. When
the reclose cancel signal is received, and a breaker trip occurs, the automatic reclose operation is inhibited
and the reclose output contacts of the relay do not close. Receipt of a reclose cancel signal will reset the
closing contacts regardless of the breaker position. The reset interval then times out when the breaker is
closed by other means to reset the relay. The reclose cancel signal provides a means of inhibiting automatic
reclosing of the breaker.
A wide range of options permit the relay to be specifically tailored to a variety of applications. Options are
available in the reclosing relay to provide a choice of three ranges for the reclosure time delay, and to
provide isolated or non-isolated contact sensing. The reclose signal to the controlled breaker may be
continuously maintained until breaker closure is detected or, optionally, may be maintained for a maximum
of 2-3 or 5-6 seconds or until breaker closure is detected.
A voltage monitor option permits active monitoring of a single phase of line and bus voltages to permit
reclosure if pre-selected live-line/live-bus, live-line/dead-bus, dead-line/live-bus and dead-line/dead-bus
voltage conditions are met. The measurable voltage input limits are adjustable over the range of 10 Vac to
135 Vac.

1-2 BE1-79S General Information
The relay assembly is mounted in a drawout cradle and enclosed in a standard, utility style, semi-flush case.
Test points and circuit components are accessible by removal of the individual printed circuit boards from
the relay cradle and using an extender board (Basler part number 9 1129 30 101) to test or troubleshoot.
An available test plug (Basler part number 10095) permits the relay to be tested in place without disturbing
external control circuit wiring.
MODEL AND STYLE NUMBER
The electrical characteristics and optional features included in a particular style BE1-79S Reclosing Relay
are defined by a combination of letters and numbers that make up its style number. The model number, and
style number, describing the options included in the specific device, appear on the front panel, drawout
cradle, and inside the case assembly. Upon receipt of a reclosing relay, be sure to check relay style number
against the requistion and packing list to see that they agree.
Style Number Example
The Style Number Identification Chart (Figure 1-1) defines the electrical characteristics and operational
features included in BE1-79S relays. For example, if the Style Number were 1lN A4C B4S0F, the device
would have the following:
(B) Single-shot reclosing with reclose initiate and reclose cancel.
(1) Lockout and reset circuits.
(A4) Reclose time delay continuously variable over the range of 5 to 60 seconds.
(C) Internal relay operating power to be obtained from an external 125 Vdc or 100/120 Vac, 50/60
Hz source.
(B) A reset timer that is continuously adjustable over the range of 5 to 60 seconds, together with a
95 second limit for the voltage monitor to accept line and bus conditions.
(4) Non-isolated contact sensing input is supplied.
(S) Line and bus voltage monitor is supplied.
(0) The reclose signal is continuous until controlled breaker is closed.
(F) Semi-flush mounting.

BE1-79S General Information 1-3
Figure 1-1. Style Number Identification Chart
SPECIFICATIONS
Power Input The following table describes the various power supplies that are
available for this relay.
Table 1-1. Power Supplies
Type Nominal Input Voltage Input Voltage
Range
Burden at
Nominal
B (Mid Range) 48 Vdc 24 to 150 Vdc 5.5 W
C (Mid Range) 125 Vdc
120 Vac
24 to 150 Vdc
90 to 132 Vac
4.0 W
10.0 VA
D (Low Range) 24 Vdc 12† to 32 Vdc 5.0 W
X (High Range) 250 Vdc
240 Vac
62 to 280 Vdc
90 to 270 Vac
5.0 W
14.0 VA
† Type D power supply initially requires 14 Vdc to begin operating. Once operating, the voltage

1-4 BE1-79S General Information
maybe reduced to 12 Vdc and operation will continue.
Contact Sensing Inputs All contact sensing inputs recognize a change in contact status within
8.0 milliseconds.
When isolated contact sensing is provided, a dedicated Form A dry
contact rated 0.05 amp at 250 Vdc is required to complete the sensing
circuit.
When non-isolated contact sensing is provided, the input is polarity
sensitive and requires 24-60 Vdc at a burden of 3.5 W for a Type B
power supply, 62-150 Vdc at 4.5 W for a Type C power supply, 12-32
Vdc at 2.0 W for a Type D power supply, and 140-280 Vdc at 7.5 W for
a Type X power supply.
Reclose Initiate (RI) Input
The RI input, when closed prior to the operation of the breaker
sensing contact (52b), initiates the relay to respond to the change of
state of the breaker sensing input.
Breaker Sensing Input
(52b)
When isolated contact sensing is provided, a dedicated Form B dry
contact rated 0.05 amp at 250 Vdc is required to complete the sensing
circuit.
When non-isolated contact sensing is provided, the input is polarity
sensitive and requires 24-60 Vdc at a burden of 3.5 W for a Type B
power supply, 62-150 Vdc at 4.5 W for a Type C power supply, 12-32
Vdc at 2.0 W for a Type D power supply, and 140-280 Vdc at 7.5 W for
a Type X power supply.
The breaker sensing input, when closed, signifies that the controlled
breaker is open
Reclose Cancel (RC)
Input
Isolated and non-isolated input requirements are the same as the
reclose initiate (RI) input above.
The reclose cancel input, when closed, terminates reclose timing and
cancels the automatic breaker reclosure.
Voltage Monitor
(Option 2-S, D) The voltage monitor compares the sensing inputs of a single phase of
line and bus voltages with pre-selected levels and permits automatic
breaker reclosure when specific voltage conditions have been satisfied.
These levels are independently adjustable over the range of 10 to 135
Vac.
Each voltage sensing input is rated for 150 Vac continuously at 50/60
Hz + 10 Hz, at amaximum burden of 1 VA.
Output Circuits
Resistive
120/240 Vac
125/250 Vdc
Make 30 A for 0.2 seconds, carry 7 A continuously, and break 7 A.
Make
30 A for 0.2 seconds, carry 7 A continuously, and break 0.1 A.
Inductive
120/240 Vac,
125/250 Vdc
Make 30A for 0.2 seconds, carry 7 A continuously, and break 0.1 A
(L/R = 0.04).

BE1-79S General Information 1-5
Reclosure Time Delay Selectable from optional ranges of 0.1 to 2 seconds, 1 to 20 seconds
or 5 to 60 seconds. Continuously adjustable with front panel control
over the selected range. Timing accuracy within 5%.
Reclose Signal May be optionally specified to be continuous until breaker closes; or
for a maximum duration of 2 to 3 or 5 to 6 seconds.
Reset Time Delay Continuously adjustable with front panel control over the range of 5 to
60 seconds. Timing accuracy within 5%.
Voltage Monitor Range Continuously adjustable over the range of 10 to 135 Vac.
Voltage Monitor Accuracy Within 3% over the range of 0 to 150 Vac for a nominal input
frequency of 50/60 Hz, and at 25!C (or within 1% from 25!C over a
temperature range of 15!C to +40!C).
Maximum Trial Timer
Accuracy
Either 95 + 10.0 seconds (with Reset Timer B) or 15 + 2.0 seconds
(with Reset Timer C), for a nominal input frequency of 50/60 Hz at
25!C. (Non adjustable.)
Temperature
Operating Temperature
Storage Temperature
-40!C (-40!F) to +70!C (+158!F).
-65!C (-85!F) to +100!C (+212!F).
Shock In standard tests, the relay has withstood 15 g in each of three
mutually perpendicular planes without structural damage or
degradation of performance.
Vibration In standard tests, the relay has withstood 2 g in each of three
mutually perpendicular planes, swept over the range of 10 to 500 Hz
for a total of six sweeps, 15 minutes each sweep, without structural
damage or degradation of performance.
Isolation In accordance with IEC 255-5 and ANSI/IEEE C37.90, one minute
dielectric (high potential) tests as follows:
All circuits to ground: 2121 Vdc
Input to output circuits: 1500 Vac or 2121 Vdc
Surge Withstand Capability Qualified to ANSI/IEEE C37.90-1978, C37.90a-1974, and IEC 255.
Weight 12.5 pounds net.
Case Size S1 (double ended).

BE1-79S Functional Description 2-1
SECTION 2 • FUNCTIONAL DESCRIPTION
GENERAL
The functional description contained in this section applies to the BE1-79S Single Shot Reclosing Relays
with all combinations of available options.
The reclosing relay, functionally shown in Figure 2-1, provides automatic reclosure of circuit breakers that
have been tripped by a protective relay. The relay uses a Form B auxiliary contact of the controlled circuit
breaker to detect the position of the breaker. A reclose initiate (RI) signal must be received from the
protective system prior to the closure of the breaker auxiliary contact. Closure of this contact indicates that
automatic reclosing is to be permitted.
A reclose cancel (RC) signal may be generated by the protective system. The RC signal must remain at
least 8 milliseconds before it is recognized by the relay. When RC is recognized, the relay is inhibited from
reclosing the controlled breaker. Following an RC signal, the controlled breaker must be closed by other
means. This permits the relay to be automatically reset by its internal reset timer as described below.
Contact sensing (52b, RI, and RC) is provided in one of two configurations. If isolated contact sensing
(Option 1-5) is specified, current is supplied to the contacts by the relay. If non-isolated contact sensing
(Option 1-4) is specified, direct current is supplied by the protective system through the contacts to the
polarity sensitive relay inputs. If the relay is equipped with the Type X power supply, these configurations
must be modified to accommodate an essential external sensing input module. (See Figure 4-9).
When Option 2-D or 2-S is included, a voltage monitor circuit compares the line and bus voltage levels
against pre-selected live-line/live-bus, live-line/dead-bus, dead-line/live-bus and dead-line/dead-bus
reclosing conditions. The reclosing conditions' voltage levels are established by adjustable controls on the
front panel. LB, DB/OV, LL and DL/OV. (The overvoltage limit (OV) mode allows an upper voltage limit to
be set for the recognition of a live-line or live-bus condition.) If the measured voltages are not correct for the
selected reclosing conditions, breaker closing is inhibited.
In some units (those with Reset Timer B or C) there is a Maximum Trial Timer on the voltage monitor board
that limits the opportunity for reclosing to either 95 or 15 seconds (for B and C respectively) after an open
breaker is sensed at the 52b input. If the required line and/or bus voltages have not been detected during
the specified time, the relay is inhibited from issuing a reclosing signal. The inhibit remains in effect until the
breaker is closed by other means, there-by circumventing the somewhat precarious situation that could
result from a relay poised to issue a reclose signal long after the instigating event has passed. (Like a loaded
gun with its safety off.)
When the controlled breaker is closed, the reset timer begins to measure a programmed interval. If the
breaker remains closed for this interval, the relay resets and is ready to perform an automatic reclosing
operation following a subsequent breaker trip by the protective system. If the breaker opens before the
programmed interval has expired, the relay is disabled (locked out) and will not respond further to the
breaker position until it is reset. Resetting is accomplished by closing the breaker by other means and its
remaining closed for the duration of the reset interval.
A red LOCKOUT indicator on the relay front panel lights when the relay generates the reclose command or
the breaker opens prior to expiration of the reset timer. It goes out when the reset time expires. A Form C
lockout relay is slaved to the LOCKOUT indicator and provides output contacts for monitoring the state of
the reclosing relay.

2-2 BE1-79S Functional Description
Figure 2-1. Functional Block Diagram
POWER SUPPLY
Basler Electric enhanced the power supply design for unit case relays. This new design created three, wide
range power supplies that replace the four previous power supplies. Style number identifiers for these
power supplies have not been changed so that customers may order the same style numbers that they
ordered previously. The first newly designed power supplies were installed in unit case relays with EIA date
codes 9638 (third week of September 1996). Relays with a serial number that consists of one alpha
character followed by eight numerical characters also have the wide range power supplies. A benefit of this
new design increases the power supply operating ranges such that the 48/125 volt selector is no longer
necessary. Specific voltage ranges for the three new power supplies and a cross reference to the style
number identifiers are shown in the following table.
Table 2-1. Wide Range Power Supply Voltage Ranges
Power Supply Style Chart Identifiers Nominal Voltage Voltage Range
Low Range D 24 Vdc 12† to 32 Vdc
Mid Range B, C 48, 125 Vdc,
120 Vac
24 to 150 Vdc,
90 to 132 Vac
High Range X 125, 250 Vdc,
120, 240 Vac
62 to 280 Vdc,
90 to 270 Vac
† 14 Vdc is required to start the power supply.
Relay operating power is developed by the wide range, isolated, low burden, flyback switching, solid state
power supply. Nominal ±12 Vdc is delivered to the relay internal circuitry. Input (source voltage) for the
power supply is not polarity sensitive. A red LED turns ON to indicate that the power supply is functioning
properly.
INITIATE CONTACT SENSING (RI)
When an external form A contact (RI) is closed (typically by a protective relay), the initiate contact sensing
circuit generates an INITIATE signal to the automatic reclose enable logic.

BE1-79S Functional Description 2-3
BREAKER OPEN SENSING (52b)
When the 52b circuit breaker auxiliary contact closes a BREAKER OPEN signal is generated by the breaker
open sensing circuit to the automatic reclose enable logic.
When the controlled breaker closes, the BREAKER OPEN signal is terminated. This occurs regardless of
the state of the other inputs to the relay. Termination of the BREAKER OPEN signal stops the reclose timer,
initiates the reset timer, and terminates the reclose output.
CANCEL CONTACT SENSING (RC)
When an external form A contact (RC) is closed, the cancel contact sensing circuit generates a RECLOSE
CANCEL signal which inhibits or terminates the automatic reclose enable logic.
AUTOMATIC RECLOSE ENABLE LOGIC
The automatic reclose enable logic allows operation of the reclose timer when a RECLOSE CANCEL or
INHIBIT signal is not present, and the INITIATE signal has been present prior to recognition of the
BREAKER OPEN signal.
RECLOSE TIMER
The reclose timer is started by the automatic reclose enable logic and measures an interval determined by
the front panel RECLOSE TIME control. At the completion of the programmed interval, if RECLOSE
CANCEL is not generated and BREAKER OPEN is still present, the reclose timer generates RECLOSE to
close the contacts of the reclose relay, energizing the breaker close coil and the internal lockout relay.
RECLOSE is terminated when the breaker closes, or when RECLOSE CANCEL is generated, or when the
maximum reclose signal time has expired (Option 3-2 or 3-3).
RECLOSE FAIL TIMER (Option 3-2 or 3-3)
A RECLOSE FAIL signal is generated by the reclose fail timer if the reclose command from the relay does
not cause the controlled breaker to close within the specified time. The RECLOSE FAIL signal, when
present, is internally applied to the cancel contact sensing circuit and has an effect similar to receiving RC
from the protective system. RECLOSE CANCEL generated in response to RECLOSE FAIL inhibits the
automatic reclose enable logic, causing it to disregard the BREAKER OPEN signal from the breaker open
sensing circuit.
For relays specified to have Option 3-0, the reclose fail timer is not present and the relay will output a
continuous RECLOSE signal until the controlled breaker is closed or until the RECLOSE CANCEL signal
is received from the RC contact.
RESET TIMER
The reset timer provides an automatic reset for the relay when the controlled breaker remains closed for the
duration of the reset interval. The reset timer measures an interval between 5 and 60 seconds as determined
by the RESET TIME control on the front panel.
When BREAKER OPEN is terminated, indicating that the controlled breaker is closed, the reset timer begins
to measure the programmed interval. At the completion of this interval, the timer generates RESET and
lights the RESET indicator. The RESET signal resets the reclose fail timer, resets the automatic reclose
enable logic so that it is able to respond to a subsequent protective trip of the breaker, deenergizes the
internal lockout relay and extinguishes the LOCKOUT indicator. Reset, with RESET indicator lit, is the
normal state for the relay as it waits for a protective breaker trip.

2-4 BE1-79S Functional Description
If a breaker trip occurs before the reset interval has expired, the RESET signal is not generated, the internal
lockout relay is energized (if not previously energized by a close command), and the relay will not attempt
to close the breaker or to reset its circuits. When this occurs, resetting of the relay requires closing the
controlled breaker by other means and its remaining closed for the duration of the reset interval.
VOLTAGE MONITOR (Option 2-D or 2-S)
This circuitry monitors a single-phase each of line and bus voltages and inhibits operation of the reclose
logic unless specific voltage conditions are met. Selector switches and adjustment controls allow tailoring
operation of the relay to a wide range of line/bus closing conditions.
Circuit board mounted switches provide selection of any combination of four permissible closing conditions:
LIVE-LINE/LIVE-BUS, DEAD-LINE/LIVE-BUS, LIVE-LINE/DEAD-BUS, AND DEAD-LINE/DEAD-BUS (see
Figure 2-2). Four front panel controls provide independent selection of the live and dead voltage levels for
the line and bus inputs over the range of 10 to 135 volts. This scheme establishes precise voltage conditions
under which reclosing can occur. Non-selection of specific closing conditions prevents closing from occurring
during these conditions.
As an example, the reclosing relay may be programmed for LIVE-LINE/LIVE-BUS DEAD-LINE/LIVE-BUS
closing, with the individual controls set for: LIVE-LINE, above 100 volts; DEAD-LINE, below 40 volts; and
LIVE-BUS, above 35 volts (Figure 2-3). In this case, reclosing would be permitted only when the line and
bus voltage conditions satisfy the front panel settings. If these conditions are not met, the voltage monitor
circuit generates an INHIBIT signal to disable the automatic reclose enable logic.
Circuit board-mounted MODE switches allow selection of either a "normal”mode or an overvoltage l im it ( OV)
mode (“normal" mode denotes non-operation of the OV mode). MODE switch no. 1 (for the live-bus
condition) and MODE switch no. 2 (for the live-line condition) allow independent selection of an adjustable
overvoltage limit (OV) level that defines a live voltage band for permissible relay closing (see Figure 2-2).
In this mode, live-line or live-bus closing will be permitted if the appropriate monitored voltage(s) is within
the permissible band.

BE1-79S Functional Description 2-5
Figure 1-1. Figure 2-2. Voltage Monitor Conditions, Modes and Voltage Levels Diagram (Option 2-D or
2-S Only)

2-6 BE1-79S Functional Description
NOTE
For proper operation of the voltage monitor logic, the "live" controls, when not used, must
be adjusted above the "dead" control leads, but below 80 Vac. Unused "dead" controls
must be adjusted fully CCW, then backed off one turn.
As shown in Figure 2-3, closing will not be permitted if the monitored bus voltage is above the selected OV
setting of 80 volts or below the "live" setting of 35 volts. Adjustments of the OV limits for the live-line and live-
bus are provided by the dual-function front panel controls, DL/ OV and DB/OV.
When the situation occurs in which both a live zone and a dead zone are elected, and OV is selected for the
live zone, the dead zone will occupy the area immediately below the live zone established by the LL or LB
control (see the OV MODE column of Figure 2-2, using the combined live-line/dead-bus and dead-line/live-
bus conditions as examples).
Figure 2-4 provides further examples of the selection of line and bus live/dead zones using the selection
diagram of Figure 2-2.
Figure 2-3. Example of Optional Voltage Monitor Live-Line/Live-Bus and Dead-Line/Live-Bus Reclosing
with Live-Bus Overvoltage Limit (
OV )

BE1-79S Functional Description 2-7
Figure 2-4. Examples of Optional Voltage Monitor Live and Dead Zones Selection
POWER SUPPLY STATUS OUTPUT (Option 2-D or 2-F)
The power supply status output relay is energized and its NC output contact is opened when power is
applied to the relay. Normal internal relay operating voltage maintains the power supply status output relay
continuously energized with its output contact open. If the power supply output voltage falls below the
requirements of proper operation, the power supply output relay is deenergized, closing the NC output
contact.

BE1-79S Human-Machine Interface 3-3
Figure 3-1. Location of Controls and Indicators
Figure 3-2. Optional Voltage Monitor Board CONDITION and MODE Switches Location

BE1-79S Human-Machine Interface 3-1
SECTION 3 • HUMAN-MACHINE INTERFACE
CONTROLS AND INDICATORS
The following table is referenced to the callouts in Figure 3-1.
Locator Control or Indicator Function
A POWER Indicator This red light emitting diode (LED) lights when
the relay power supply is supplying a nominal
+12 Vdc to the relay internal circuitry.
B RESET Indicator This red LED lights when the controlled breaker
has remained closed for the duration of the
programmed reset time and the relay is reset.
The indicator goes out when the breaker opens
(52b closes).
C RESET TIME Control
This continuously adjustable dial provides a
means for the operator to set the reset time
interval. The range is from 5 to 60 seconds.
D DB/OV Indicator
(Option 2-S, D)
This red LED lights when the bus voltage is less
than the dead-bus setting during the normal
mode, or less than the overvoltage limit setting
during the overvoltage limit mode.
E DB/OV Control
(Option 2-S, D)
This multi-turn screw, accessible through the
front panel, provides continuous selection over a
range of 10 to 135 volts of the dead-bus (DB)
voltage monitoring level during the normal mode,
or the overvoltage limit for the live-bus voltage
monitoring level during the overvoltage limit
mode. Adjustment is by small screwdriver.
Minimum voltage is CCW.
When unused, this control must be adjusted fully
CCW, then backed off one turn.
F LB Control
(Option 2-S, D)
This multi-turn screw, accessible through the
front panel, provides continuous selection over a
range of 10 to 135 volts of the live-bus voltage
monitoring level. Adjustment is by small
screwdriver. Minimum voltage is CCW. This
control must always be set higher than the DB
control, whether or not the LB function is used.
When not in use, be sure (additionally) that it is
set lower than 80 Vac.
G LB Indicator
(Option 2-S, D)
This red LED lights when the bus voltage is
greater than the live-bus setting.

Locator Control or Indicator Function
3-2 BE1-79S Human-Machine Interface
H DL/OV Control
(Option 2-S, D)
This multi-turn screw, accessible through the
front panel, provides continuous selection over a
range of 10 to 135 volts of the dead-line voltage
monitoring level during the normal mode, or the
overvoltage limit for the live-line voltage
monitoring level during the overvoltage limit
mode. Adjustment is by small screwdriver.
Minimum voltage is CCW.
When unused, this control must be adjusted fully
CCW, then backed off one turn.
I DL/OV Indicator
(Option 2-S, D)
This red LED lights when the line voltage is less
than the dead-line setting during the normal
mode, or less than the overvoltage limit setting
during the overvoltage limit mode.
J LL Control
(Option 2-S, D) This multi-turn screw, accessible through the front
panel, provides continuous selection over a range
of 10 to 135 volts of the live-line voltage monitoring
level.
Adjustment is by small screwdriver. Minimum
voltage is CCW.
This control must always be set higher than the DL
control, whether or not the LL function is used.
When not used, be sure (additionally) that it is set
lower than 80 Vac.
K LL Indicator
(Option 2-S, D)
This red LED lights when the line voltage is
greater than the live-line setting.
L RECLOSE TIME Control
This continuously adjustable dial provides a
means for the operator to set the reclose time
delay. The relay may be specified with one of
three optional ranges: 0.1 to 2 seconds, 1 to 20
seconds, or 5 to 60 seconds.
M LOCKOUT Indicator This red LED lights when the relay generates a
reclose command, or if the breaker reopens
before the reset timer has expired. The indicator
goes out when the breaker is closed and the
reset time interval expires.

BE1-79S Human-Machine Interface 3-3
Figure 3-1. Location of Controls and Indicators
Figure 3-2. Optional Voltage Monitor Board CONDITION and MODE Switches Location