219Section 12 Paralleling System InformationTP-6953 7/19
12.6.3 Synchronization
Synchronizing parameters are found under the
Synchronization Control heading in SiteTecht and
under the Generator Info -> Paralleling Operation ->
Synchronizing Setup menu on the user interface of the
controller. The Synchronizing Status parameters can be
found under the Synchronization Metering heading in
SiteTecht.
Sync Mode in Auto
The Sync Mode in Auto is the mode that the paralleling
logic uses for synchronization control when the
generator is operating in Auto. The Decision-Makerr
3500 controller supports the following Sync Modes:
D Off
Synchronizing is disabled—the breaker will not c lose,
even to a dead bus.
D Passive
The Decision-Makerr 3500 controller will not attempt
to control the speed and voltage of the generator
(although that can be controlled remotely), but will
close the breaker if the voltage, frequency, and phase
are all matched for the Dwell Time. After breaker
closure, the controller will assume control of the
speed and voltage bias to share load. The breaker will
close to a dead bus in Passive mode.
D Check
The Decision-Makerr 3500 controller activates the
auto-synchronizer, but does not close the breaker to a
live bus (even if the voltage, frequency, a nd phase are
all matched for the dwell time). The breaker will close
to a dead bus in check mode.
D Active
The Decision-Makerr 3500 controller activates the
auto-synchronizer, and will close the breaker to a live
bus if the voltage, frequency, and phase are all
matched for the dwell time.
D Dead Field
The Synch mode cannot be set to this value in
standard applications.
Setting Dead Field Synch mode will cause this unit to
start, close the breaker at a given engine RPM, and
soft-ramp the voltage to the final target. All generators
that start with this synch mode configuration will reach
rated voltage and frequency in parallel.
Note: Dead Field Paralleling is not supported in
standard applications, the DFP voltage
ramp rate, DFP breaker close RPM, and
DFP fail RPM are not available as
user-adjustable parameters.
Note: Synchronization will not occur if the bus is live and
has different phase rotation than the generator.
Range: 1–4(Off–Active)
Default: 4 (Active)
Sync Mode in Run
The Sync Mode in Run is the mode that the paralleling
logic uses for synchronization control when the
generator is operating in Run. Available modes are the
same as the Sync Mode in Auto.
Range: 1–4(Off–Active)
Default: 3 (Check)
Voltage Match Window
The voltage match window defines the maximum
difference between the average line-line voltage of the
generator and the average line-line voltage of the
paralleling bus which will allow the generator voltage to
be considered as matching the bus voltage. The
generator voltage can be above or below the bus
voltage, but must be within the Voltage Match Window of
the bus to be considered to be matched.
This parameter is intended to avoid excessive current
due to reactive power transfer. A large voltage difference
may cause reactive power to transfer between
generators when the paralleling breaker is closed.
Range: 1 – 10%
Default: 1%
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