Basler Electric BE1-81O/U - Manual (Page 10)

4 9137300990 Rev N
Locator Function
C Time Delay Selector Switches. A set of two thumbwheel switches sets the time delay
between the corresponding frequency setpoint (locator H) 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.
D 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.
E Power Indicator. This LED lights when operating power is applied to the relay.
F Target Reset Switch. Operating this switch resets all of the target indicators.
G 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.
H 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.
I Over/Under Selector Switch. A two-position toggle switch configures the corresponding
frequency setting (locator H) as an overfrequency (O) or underfrequency (U) setpoint. One
selector switch 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 1, locator C) 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With the cradle assembly withdrawn from the case, the three-section Selector Switches are accessed at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 3 illustrates the location of S7 on a BE1-81O/U relay with two
setpoints.
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.
Controls and Indicators BE1-81O/U