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2-3
energized. If any one of these input signals is removed prior to the end of the countdown (or timing)
period, the Closing Contact Circuit will not be enabled. Removal of the 0.75S DELAY jumper will
bypass this time delay function and thereby provide instantaneous operation of the Closing
Contact Circuit.
(6) Closing Circuit.
(a) When energized, the Closing Contact will cause the front panel SYNC indicator to il-
luminate and the Breaker Closing Output Contacts to close. A reset signal will also be generated to
cause a reset of all control signals.
(b) The front panel TEST switch, when in the TEST position, will allow the front panel
SYNC indicator only to function. The Closing Contact Circuit will be inhibited.
c. Dead Bus Option Theory of Operation. When the sensed bus voltage is less than the dead bus
setting, an output signal is applied to the output circuit to energize the Sync Output Relay and to
illuminate the front panel SYNC indicator. A front panel accessible potentiometer determines the
voltage level for a "dead bus".
d.
Frequency/Phase Matching Option Theory of Operation.
(1) The Frequency/Phase Matching Circuit will output signals proportional to the difference
frequency and input them to the Gate Circuit. When the slip (difference) frequency exceeds ±3
Hertz, these correction signals will be at their maximum level. Frequency correction signals are
applied to the output circuits when the sensed input voltages (bus and generator) are above the
minimum voltages given in Table 1-1.
(2) The frequency correction output will either be a "raise/lower" contact for use with motor
operated control (MOC) type governors or a "bipolar" type output for use with summing point type
electronic governors.
e. Voltage Matching Option Theory of Operation.
(1) When the voltage difference between the bus and the oncoming generator is greater than
±1% - ±5% of the bus voltage (as preselected by a switch), the Voltage Matching Circuit will apply a
signal to the Gate Circuit. Voltage correction signals will be applied to the output circuits when the
sensed input voltages (bus and generator) are above the minimum voltages given in Table 1-1.
(2) The voltage correction signals will drive either a "raise/lower" contact type output for use with
motor operated control (MOC) type voltage regulators or a "bipolar" type output for use with the
summing point type input of Basler Electric voltage regulators (types SSR, XR, SR, and KR) and for
exciter regulators (types SSE and SER-CB).
NOTE
Even though the BE3-25A always has frequency matching, for pur-
poses of discussion, it is considered an option because of the two
types that may be selected (summing point or contacts).