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.

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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

9137300990 Rev J BE1-81O/U General Information 1-3
SPECIFICATIONS
BE1-81O/U electrical and physical specifications are listed in the following paragraphs.
Sensing Input
Voltage Range: 40 to 132 Vac
Frequency
Detection Range: 30 to 80 Hz (Revision D and subsequent)
35 to 80 Hz (Revision C and previous)
Computation Range: 40 to 70 Hz
Burden: 2 VA maximum
Operating Power Input
Relay operating power may be obtained from a wide variety of external voltage sources. When ordering,
any one of five internal power supply types may be selected to match the operating power voltage level
available at your site. Available power supply types are listed in Table 1-1.
Table 1-1. Power Supply Types
Input Voltage
Type Nominal Range Burden at Nominal
K (midrange) 48 Vdc 24 to 150 Vdc 3.6 W
J (midrange) 125 Vdc
120 Vac 24 to 150 Vdc 90 to 132 Vac 3.9 W 16.0 VA
L (low range) 24 Vdc 12 to 32 Vdc ∗3.7 W
Y (mid range) 48 Vdc
125 Vdc 24 to 150 Vdc 24 to 150 Vdc 3.6 W 3.9 W
Z (high range) 250 Vdc
240 Vac 68 to 280 Vdc 90 to 270 Vac 3.9 W 24.6 VA
∗The type L power supply initially requires 14 Vdc to begin operating. Once operating, the voltage may
be reduced to 12 Vdc and operation will continue.
Relay Outputs
One relay output is provided for each setpoint. Relay outputs can be specified as normally open or
normally closed. One normally open or normally closed auxiliary relay output per setpoint is also available
as an option.
Output Contacts
Resistive Ratings
120 Vac: Make, break, and carry 7 Aac continuously
250 Vdc: Make and carry 30 Adc for 0.2 s, carry 7 Adc continuously, and break 0.3 Adc
500 Vdc: Make and carry 15 Adc for 0.2 s, carry 7 Adc continuously, and break 0.3 Adc
Inductive Ratings
120 Vac, 125 Vdc, 250 Vdc: Break 0.3 A (L/R = 0.04)
Target Indicators (optional)
Electronically latching, manually reset targets indicate that a setpoint contact has energized. Either
internally operated or current operated targets may be specified.
Current operated targets require a minimum trip circuit current of 200 milliamperes and have a continuous
rating of 3 amperes, a two-minute rating of 7 amperes, and a one-second rating of 30 amperes.
Internally operated targets should be selected if the relay has normally-closed output contacts.

1-4 BE1-81O/U General Information 9137300990 Rev J
Frequency Setpoint
Range: 40 to 70 Hz
Increment: 0.01 Hz
Accuracy: ±0.01 Hz of the setpoint setting
Time Delay
Definite Time (E1 & E2)
Setting Range
Cycles (of applied freq.): 3 to 99 cycles in 1 cycle increments
10 to 990 cycles in 10 cycle increments
100 to 9900 cycles in 100 cycle increments
Seconds: 0.1 to 9.9 seconds in 0.1 second increments
1.0 to 99 seconds in 1 second increments
10 to 990 seconds in 10 second increments
Accuracy
Cycles: ±1.0 cycle
Seconds: ±2% of the setting or ±25 ms, whichever is greater
Inverse Time (D1) (Option no longer available)
TIME DELAY setting is 0.1 to 9.9 (99 curve settings). The characteristic curve plot points shown in
Figures 1-2 and 1-3 are calculated from the following equation. (All possible curves are NOT shown on
the graphs.)
SetpointfromDifferenceFrequency Setting(Curve)DELAYTIME
PointPlotCurve =
Curve plot point range (time delay in seconds) is 0.1 to 100 seconds for a frequency difference of 0 to 10
hertz from the FREQUENCY setpoint. Actual time delay is the sum of the elapsed time for three cycles of
the input frequency (timing circuits require three cycle continuous excursion through the setpoint) plus the
time for the plotted point on the curve.
Undervoltage Inhibit
Setting Range: 40 to 120 Vac
Accuracy: ±5% of the setting at 25°C for nominal frequency input
Type Tests
Dielectric Strength: Meets IEC 60255-5 and exceeds IEEE C37.90 one-minute dielectric
tests as follows:
All circuits to ground: 2828 Vdc
Input to output circuits: 2000 Vac or 2828 Vdc
Surge Withstand Capability: Qualified to IEEE C37.90.1-1989
Fast Transient: Qualified to IEEE C37.90.-11989
Impulse: Qualified to IEC 60255-5
Radio Frequency Interference: Maintains proper operation when tested in accordance with IEEE
C37.90-1989
Field tested using a 5-watt, hand-held transceiver operating at random
frequencies centered around 144 MHz and 440 MHz, with the antenna
located 6 inches (152 millimeters) from the relay in both horizontal and
vertical planes.
Shock: Withstands 15 G in each of three mutually perpendicular axes
Vibration: Withstands 2 G in each of three mutually perpendicular axes swept over
the range of 10 to 500 Hz for a total of six sweeps, 15 minutes each
sweep.

9137300990 Rev J BE1-81O/U General Information 1-5
Temperature Ratings
Operating: –40°C to 70°C (–40°F to 158°F)
Storage: –65°C to 100°C (–85°F to 212°F)
UL Recognized
UL recognized per Standard 508, UL File No. E97033. Note: Output contacts are not UL recognized for
voltages greater than 250 volts and input power supply voltages greater than 150 volts.
GOST-R
Gost-R certified No. POCC US.ME05.B03391; complies with the relevant standards of Gosstandart of
Russia. Issued by accredited certification body POCC RU.0001.11ME05.
Case Size
One or Two Setpoints: S1 (See Section 4, Installation for case dimensions.)
Three or Four Setpoints: M1 (See Section 4, Installation for case dimensions.)
Weight
S1 Case: 13 lb (5.90 kg) net
M1 Case: 18 lb (8.16 kg) net

1-6 BE1-81O/U General Information 9137300990 Rev J
Figure 1-2. Inverse Time Overfrequency Characteristic Curves

9137300990 Rev J BE1-81O/U General Information 1-7
1.0
0.9
0.5
0.6
0.8
0.4
0.3
0.2
0.7
6.0
7.0
9.0
5.0
4.0
3.0
8.0
2.0
967854
3210
D2645-09
04-07-97
0.110
Time Delay Setting
Time in seconds
0.10
0.01
1.00
10.00
100.00
Frequency Difference From Setpoint (Hz)
9.9
Figure 1-3. Inverse Time Underfrequency Characteristic Curves

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9137300990 Rev J BE1-81O/U Controls and Indicators 2-1
SECTION 2 •CONTROLS AND INDICATORS
INTRODUCTION
BE1-81O/U controls and indicators are located on the front panel and circuit boards.
FRONT PANEL
The front panel controls and indicators are shown in Figure 2-1 and described in Table 2-1.
Figure 2-1. Front Panel Controls and Indicators
Table 2-1. Front Panel Controls and indicators
Locator Function
A Undervoltage Inhibit Control. Relay operation is inhibited when the sensed voltage
decreases below the setting of this multi-turn potentiometer. The Undervoltage Inhibit
Control has a setting range of 40 to 120 Vac. The BE1-81O/U is delivered with the
control set at 80 Vac.
B Undervoltage Inhibit Indicator. This light emitting diode (LED) lights when the sensed
voltage decreases below the setting of the Undervoltage Inhibit Control. Relay
operation is inhibited when this LED is on.
C Over/Under Selector Switch. A two-position toggle switch configures the corresponding
frequency setting (locator D) as an overfrequency (O) or underfrequency (U) setpoint.
One selector switch is provided for each frequency setpoint of the relay.

2-2 BE1-81O/U Controls and Indicators 9137300990 Rev J
Locator Function
D Frequency Selector Switches. A set of four thumbwheel switches adjusts the setpoint
frequency in 0.01 hertz increments over an allowable range of 40 to 70 hertz. One set
of four thumbwheel switches is provided for each frequency setpoint of the relay. Note
that selecting a setting outside the 40 to 70 hertz range will result in a loss of frequency
protection.
E Target Indicators. Electronically-latching red target indicators illuminate when the
associated setpoint output relay energizes. When the optional targets are specified, a
target indicator is provided for each frequency setpoint of the relay. To ensure proper
operation of current-operated targets, the trip circuit current must be greater than 200
milliamperes.
F Target Reset Switch. Operating this switch resets all of the target indicators.
G Power Indicator. This LED lights when operating power is applied to the relay.
H Pickup Indicator. When an underfrequency or overfrequency condition is detected, the
corresponding pickup indicator lights and stays lit until the frequency returns to a non-
trip level.
I Time Delay Selector Switches. A set of two thumbwheel switches sets the time delay
between the corresponding frequency setpoint (locator D) pickup and output relay
reaction. The time delay obtained by these switches is affected by the setting of
Selector Switch S7. See Circuit Board for details about configuring S7. One set of two
thumbwheel switches is provided for each frequency setpoint of the relay.
CIRCUIT BOARD
A single control, Selector Switch S7, is located on the Definite Time circuit boards. (The number of
Definite Time circuit boards corresponds to the number of setpoints specified by the relay style number.)
S7 configures the Time Delay Selector Switches (Table 2-1, locator I) to adjust the definite time delay in
seconds or cycles and have a multiplier of times 1, 10, or 100.
With the cradle assembly withdrawn from the case, the three-section Selector Switches are accessed at
the right side of the cradle assembly. Figure 2-2 illustrates the location of S7 on a BE1-81O/U relay with
two setpoints.
Figure 2-2. Location of Selector Switch S7

9137300990 Rev J BE1-81O/U Controls and Indicators 2-3
Multiplier Settings
Sections S7-1 and S7-2 configure the multiplier used with the Time Delay Selector Switches.
For a times one (X1) multiplier, S7-1 and S7-2 are placed in the down position.
For a times 10 (X10) multiplier, S7-1 is placed in the up position and S7-2 is placed in the down position.
A times 10 multiplier is also obtained when S7-1 is placed in the down position and S7-2 is placed in the
up position.
For a times 100 (X100) multiplier, S7-1 and S7-2 are placed in the up position.
Cycles/Seconds Settings
S7-3 either selects cycles or seconds as the unit of measure for the definite time delay. S7-3 is placed in
the up position to select cycles. The down position of S7-3 selects seconds.

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