Basler BE1-81O/U User manual

INSTRUCTION MANUAL
FOR
DIGITAL FREQUENCY RELAY
BE1-81O/U
Publication: 9137300990
Revision: J 10/07

9137300990 Rev J BE1-81O/U Introduction i
INTRODUCTION
This instruction manual provides information about the operation and installation of the BE1-81O/U Digital
Frequency Relay. To accomplish this, the following information is provided:
•General Information and Specifications
•Controls and Indicators
•Functional Description
•Installation
•Testing
WARNING!
To avoid personal injury or equipment damage, only qualified personnel should
perform the procedures in this manual.
NOTE
Be sure that the relay is hard-wired to earth ground with no smaller than 12 AWG
copper wire attached to the ground terminal on the rear of the unit case. When
the relay is configured in a system with other devices, it is recommended to use a
separate lead to the ground bus from each unit.

ii BE1-81O/U Introduction 9137300990 Rev J
First Printing: June 1982
Printed in USA
© 1982, 1993, 1998-1999, 2003, 2007 Basler Electric, Highland Illinois 62249 USA
All Rights Reserved
October 2007
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.
BASLER ELECTRIC
ROUTE 143, BOX 269
HIGHLAND IL 62249 USA
http://www.basler.com, [email protected]
PHONE [phone] FAX [phone]
CONFIDENTIAL INFORMATION
of Basler Electric, Highland Illinois, USA. 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.

9137300990 Rev J BE1-81O/U Introduction iii
REVISION HISTORY
The following information provides a historical summary of the changes made to the BE1-81O/U
instruction manual (9137300990). Revisions are listed in reverse chronological order.
Manual
Revision and Date Change
J, 10/07 •Added manual part number and revision to all footers.
•Updated power supply burden data in Section 1.
•Updated output contact ratings in Section 1.
•Updated front panel drawings to show LED targets.
•Updated target description in Section 3.
H, 09/03 •Removed references to timing option D1.
•Made various minor corrections throughout manual.
G, 06/99 •Revised style chart to reflect changes to the E1 and E2 timing
options.
•Changed dielectric test specification listed in Sections 1 and 4.
•Figures 2-3 and 3-3 were updated to show the three-position Selector
Switch S7.
•All case drawings were updated to show revised case covers.
•Definite time delay options test procedures (Section 5) were modified
to accommodate the new E1 and E2 timing options.
F, 04/98 •Revised paragraph styles.
•Section 1: Changed frequency sensing limits to 30 and 80 Hz and
deleted paragraphs concerning revision levels. Modified power supply
ranges. Changed pickup accuracy from ±0.008 Hz to ±0.01 Hz. New
statement was added to Isolation, added IEEE qualification
statement, added UL recognition, corrected M1 case weight, and
corrected Inverse Time Over/Underfrequency Characteristic Curve
diagrams (Figures 1-2 and 1-3).
•Section 3: Added wide-range power supply data and deleted Figure
3-5.
•Section 4: Extracted testing and adjustment information and created
new Section 5, Tests and Adjustments. Incremented remaining
section numbers as required. Inserted additional installation diagrams
to cover all relay styles.
E, 03/93 •Various relay changes were incorporated into the manual.

iv BE1-81O/U Introduction 9137300990 Rev J
This page intentionally left blank.

9137300990 Rev J BE1-81O/U Introduction v
CONTENTS
SECTION 1 •GENERAL INFORMATION................................................................................................ 1-1
INTRODUCTION................................................................................................................................. 1-1
FEATURES......................................................................................................................................... 1-1
Frequency Setpoints..................................................................................................................... 1-1
Time Delays.................................................................................................................................. 1-1
Undervoltage Inhibit...................................................................................................................... 1-1
Targets.......................................................................................................................................... 1-1
OPERATION....................................................................................................................................... 1-1
STYLE NUMBER................................................................................................................................ 1-1
SPECIFICATIONS.............................................................................................................................. 1-3
Sensing Input................................................................................................................................ 1-3
Operating Power Input.................................................................................................................. 1-3
Relay Outputs............................................................................................................................... 1-3
Output Contacts............................................................................................................................ 1-3
Target Indicators (Optional).......................................................................................................... 1-3
Frequency Setpoint ...................................................................................................................... 1-4
Time Delay.................................................................................................................................... 1-4
Undervoltage Inhibit...................................................................................................................... 1-4
Type Tests.................................................................................................................................... 1-4
Temperature Ratings.................................................................................................................... 1-5
UL Recognized............................................................................................................................. 1-5
GOST-R........................................................................................................................................ 1-5
Case Size ..................................................................................................................................... 1-5
Weight........................................................................................................................................... 1-5
SECTION 2 •CONTROLS AND INDICATORS ....................................................................................... 2-1
INTRODUCTION................................................................................................................................. 2-1
FRONT PANEL................................................................................................................................... 2-1
CIRCUIT BOARD................................................................................................................................ 2-2
Multiplier Settings......................................................................................................................... 2-3
Cycles/Seconds Settings.............................................................................................................. 2-3
SECTION 3 •FUNCTIONAL DESCRIPTION........................................................................................... 3-1
INTRODUCTION................................................................................................................................. 3-1
FUNCTIONAL DESCRIPTION ........................................................................................................... 3-1
Input Signal................................................................................................................................... 3-1
Undervoltage Inhibit...................................................................................................................... 3-1
Zero Crossing Logic ..................................................................................................................... 3-1
Crystal Oscillator .......................................................................................................................... 3-1
Period Clock Generator................................................................................................................ 3-1
Minimum Period Difference Logic ................................................................................................ 3-1
Maximum Period Difference Logic................................................................................................ 3-3
Measured Frequency Converter................................................................................................... 3-3
Frequency Comparator Logic....................................................................................................... 3-3
Definite Time Delay Logic............................................................................................................. 3-3
Relay Outputs............................................................................................................................... 3-5
Auxiliary Relay Outputs................................................................................................................ 3-5
Power Supply................................................................................................................................ 3-5
Power Supply Status Output ........................................................................................................ 3-5
Target Indicators........................................................................................................................... 3-5
SECTION 4 •INSTALLATION.................................................................................................................. 4-1
INTRODUCTION................................................................................................................................. 4-1
OPERATING PRECAUTIONS............................................................................................................ 4-1
MOUNTING......................................................................................................................................... 4-1
CONNECTIONS................................................................................................................................ 4-15
MAINTENANCE................................................................................................................................ 4-16
STORAGE......................................................................................................................................... 4-16

vi BE1-81O/U Introduction 9137300990 Rev J
SECTION 5 •TESTING ............................................................................................................................ 5-1
INTRODUCTION................................................................................................................................. 5-1
TEST EQUIPMENT............................................................................................................................. 5-1
OPERATIONAL TEST ........................................................................................................................ 5-1
Frequency Selector Settings ........................................................................................................ 5-2
Definite Time Delay - Cycles........................................................................................................ 5-3
Definite Time Delay - Seconds..................................................................................................... 5-3
Undervoltage Inhibit...................................................................................................................... 5-3
Setpoint 2, 3, and 4 Testing.......................................................................................................... 5-4

9137300990 Rev J BE1-81O/U General Information 1-1
SECTION 1 •GENERAL INFORMATION
INTRODUCTION
The BE1-81O/U Digital Frequency Relay monitors the frequency of a single-phase, ac voltage and
provides accurate frequency protection for a distribution system or generator operating at 50 or 60 hertz.
The BE1-81O/U initiates removal of a load from a distribution system when the system frequency
decreases below the relay’s adjustable setpoint. When the system frequency returns to normal (as
defined by another setpoint), the BE1-81O/U permits restoration of the load. The BE1-81O/U may be
tailored to the operating frequency/time characteristic of a generator to permit removal of the generator
from service if the generator frequency (or system frequency) exceeds a setpoint. This scheme also
permits restoration to service when the generator (or system) frequency returns to normal.
FEATURES
The BE1-81O/U can be specified with up to four independently adjustable frequency setpoints and time
delays with associated output relays and target indicators.
Frequency Setpoints
Each frequency setpoint has a setting range of 40 to 70 hertz and can be switch selected to detect over-
frequency or underfrequency. BE1-81O/U relays with one or two setpoints are supplied in an S1 case.
Relays with three or four setpoints are supplied in an M1 case.
Time Delays
Each definite time delay setting can be adjusted for a delay of three cycles to 990 seconds.
Undervoltage Inhibit
An undervoltage inhibit feature prevents relay operation if the sensed voltage decreases below the
adjustable front panel setting.
Targets
Either internally-operated or current-operated target indicators are available for each setpoint.
OPERATION
When the sensed frequency passes through a setpoint in the selected direction, a three-cycle timer
begins timing. If the condition persists for the duration of the three-cycle timer, the Pickup LED indicator
lights and the definite time delay is triggered. If the pickup condition persists for the duration of the time
delay setting, the corresponding output relay energizes, operates the appropriate output contacts, and
trips the setpoint’s target indicator.
STYLE NUMBER
BE1-81O/U electrical characteristics and operating features are defined by a combination of letters and
numbers that make up the relay style number. The style number describes the features and options of a
particular relay and appears on the front panel, draw-out cradle assembly, and the relay case. The style
number identification chart shown in Figure 1-1 illustrates the features and options for the BE1-81O/U
relay.

1-2 BE1-81O/U General Information 9137300990 Rev J
Figure 1-1. Style Number Identification Chart
For example, if the BE1-81O/U style number was T3E E1J A9N2F, the relay would have the following
features and options.
T-------------Single-phase sensing input
3-------------100/120 Vac, 40 to 70 Hz nominal sensing range
E------------One normally-open output relay per setpoint
E1-----------Definite time delay, selectable for cycles or seconds
J-------------125 Vdc or 120 Vac relay operating power
A------------One internally-operated target for each setpoint
9-------------Four frequency setpoints
N------------No power supply status output
2-------------One normally-closed, auxiliary relay output for each setpoint
F-------------Semi-flush case mounting