1-2
(4) Upon a loss of power (power input falls below 85 Vac for 50 and 60 Hertz systems) or
removal of either the bus or generator sensing input voltage, the Synchronizer will immediately
remove all output correction signals to the governor or voltage regulator.
(5) A built-in "operational test" mode can be used to verify Synchronizer operation when
connected to the generator. The Sync Output Relay is inhibited from operating when the
TEST/OPERATE switch is set to the TEST position. A red LED (SYNC) on the front panel will
illuminate whenever the frequency, phase angle, and voltage are all within the contact closure
parameters.
c. Frequency/Phase Angle Matching System.
(1) The frequency/phase angle matching options in the Synchronizer provide correction signals
to the generator governor control. Two types of frequency/phase angle matching are available:
(a) "Bipolar" governor correction signals (summing point) for use with most common
electronic type governor controls manufactured by AMBAC International, Barber Coleman, and
Woodward. Summing point frequency correction signals are output at maximum until the generator
frequency is corrected to within ±3 Hertz of the station bus frequency. Once the ±3 Hertz limit is
attained, the output signals become proportional to the amount of the difference frequency (i.e.: the
output for a 3 Hertz difference is larger than the output for a 1 Hertz difference).
(b) A "raise/lower" output contact signal for use with hydraulic type governors and motor
operated controls. Contact type correction signals are output as a contact closure. When the phase
angle is 0
°
or within the front panel setting for acceptable phase conditions, the contacts open and
remain open. At any phase angle greater than the front panel setting, the contacts are closed.
(2) The output signals will continue until the conditions for breaker closure are satisfied.
d. Voltage Matching Option.
(1) When the voltage matching option is specified, the Synchronizer provides correction signals
to the generator voltage regulator or excitation system when the voltage difference between the
generator voltage and the bus voltage exceeds the ±1% to ±5% of the bus voltage range as deter-
mined by the front panel setting.
(2) Two types of voltage matching are available:
(a) "Bipolar" regulator correction signals for use with the summing point input of Basler
Electric voltage regulators (types: SSR, SR, KR, and XR) and exciter regulators (types: SSE and
SER-CB).
(b) A "raise/lower" output contact signal for with motor operated controls (Basler Electric
type: MOC).
(3) The voltage differential is selectable in 1% increments over a range of ±1% to ±5% by a
front panel accessible rotary switch.
NOTE
If the governor control, actuator, and associated linkage are
not properly adjusted, the BE3-25A output may not be able to
drive the governor far enough to allow synchronization.
