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With the cradle assembly withdrawn from the case, the three-section Selector Switches are accessed at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
Summary of Contents for BE1-81O/U
Page 2: ......
Page 6: ...iv BE1 81O U Introduction 9137300990 Rev J This page intentionally left blank...
Page 16: ...1 8 BE1 81O U General Information 9137300990 Rev J This page intentionally left blank...
Page 20: ...2 4 BE1 81O U Controls and Indicators 9137300990 Rev J This page intentionally left blank...
Page 26: ...3 6 BE1 81O U Functional Description 9137300990 Rev J This page intentionally left blank...
Page 31: ...9137300990 Rev J BE1 81O U Installation 4 5 Figure 4 4 S1 Case Dimensions Rear View...
