TP-6953 7/19 163Section 9 Component Testing and Adjustment
9.10 Motor-Operated Circuit
Breakers (if equipped)
The Decision-Makerr 3500 controller provides
automatic operation of a motor-operated circuit breaker
including opening and closing of the breaker and
synchronization of the generator output to the
paralleling bus.
Note: The motor operator breaker requires a constant
supply voltage of 24- 30VDC. Supply voltages
below 24VDC will result in failure of the motor
operator breaker.
9.10.1 Auto matic Closin g of the Breaker
Note: The Decision-Makerr 3500 controller will only
close the breaker if it receives a signal to run.
Note: In paralleling applications (two or more generator
sets), PGEN connection is required to close the
breaker. See PGEN connection information in
the Installation Manual (TP-6952 or TP-7045) if
required.
Note: In a single generator application with no PGEN
connection, set the Stand Alone Operation
parameter to ON in the Synchronization Control
Menu in order to close the breaker.
Dead Bus Closure:
The Decision-Makerr 3500 controller monitors the
following to determine if it is safe to close the paralleling
breaker to a dead bus:
D Voltage on the paralleling bus sensing
connections to the controller. The paralleling bus
voltage must be below the dead bus threshold.
D The status of the paralleling breakers of the o ther
generators on the paralleling bus. All the other
generators in the system must have open breakers if
the bus is perceived to be dead for the following
reasons:
D It is potentially harmful to provide voltage to the
stator of a stopped generator.
D If the other generator is running but the bus sensing
does not indicate bus voltage, the bus sensing for
the controller may not be connected and it may
close out of phase to a live paralleling bus.
D The voltage and frequency of the generator.
There is no benefit to closing the paralleling breaker
to a dead bus if the generator is not producing rated
voltage and frequency. The breaker will not close
until the generator output is within spec to avoid
providing power that is out of certain specifications.
D Permission from other generators. Only one
generator is permitted to close to t he paralleling bus
when it is dead. This generator will be selected from
among the running generators based on the
following:
D The first generator to start.
D The generator controller with the lowest serial
number (if they are both running at the same time).
No controller will signal the motor-operated breaker
to close until all the other generators have conceded
that it will be the first to close.
D System configuration parameters:
D SynchModeinAuto
If the generator is operating in Auto M ode (the LED
above the Auto button is illuminated), this
parameter must be set to one of the following for
the controller to signal the breaker to close to a
dead bus:
d Check
d Passive
d Active
D SynchModeinRun
If the generator is operating in Run Mode (the LED
above the Run button is illuminated), this
parameter must be set to one of the following for
the controller to signal the breaker to close to a
dead bus:
d Check
d Passive
d Active
Note: The Check Sync Mode will only close the
paralleling breaker to a dead bus, not a live one.
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