205Section 12 Paralleling System InformationTP-6953 7/19
Generator Management
The Decision-Makerr 3500 controller contains integral
Generator Management. This functionality is disabled
by default, but can be enabled to mana ge fuel
consumption, wear and tear, and sound levels.
All generator controllers in the system need to have the
same settings for the following parameters before
Generator Management will be active:
D Gen Management Control Mode.
D Gen Management Run Time Threshold.
D Gen Management Fuel Difference Threshold.
D Gen Management Stable Delay.
D Gen Management Min Gens Online.
D Gen Management Min Load Shed Priority.
A warning is displayed when Generator Management is
disabled because of a parameter mismatch.
Load Management
Paralleling is not required for load management
(add/shed) to function, but in Internal Paralleling
applications, the load shed priorities can be distributed
between controllers, as a generator does not have to be
running to operate load shed priorities based on the bus
load and frequency.
12.2 Choosing an Application
Because the Decision-Makerr 3500 controller supports
different operational modes, it is important that the
mode is matched to the application where the generator
will be used.
12.2.1 Single Generator
Single generator applications require no setup and are
by far the simplest. This mode is for applications where a
single generator is connected to loads though a
manually-operated circuit breaker, where there will be
no chance of paralleling with the utility and there is no
external gear provided for generator control.
This application can be used even when multiple
generators are included in a given power network, as
long as the two generators feed different distribution
busses. This application is not recommended with
paralleling-capable generators, as a failure on either
generator will put a portion of the load out of power
(regardless of the load on the other generator) and there
is no simple way to prioritize loads.
12.2.2 External Paralleling
Many applications require paralleling with existing
generators. Because the Decision-Makerr 3500
controller is intended to parallel only with generators
which are also running Decision-Makerr 3500
controllers, external gear is required to coordinate
operation with another generator.
Certain applications require unique Generator
Management scenarios or paralleling requirements (such
as dead-field paralleling). These applications will require
external gear to provide support for the unique features.
12.2.3 Internal Paralleling
Any multi-generator application where the generators
are all operated by Decision-Makerr 3500 controllers
and the standard controller functionality is sufficient for
the application. This includes most standby and prime
power applications where the standard Generator
Management and load management are sufficient to
support the customer requirements.
12.3 Paralleling Configuration
Considerations
The Decision-Makerr 3500 controller requires that all
units connected to a communications network for
paralleling (PGEN) need to match in the following key
areas:
D System Voltage
D System Frequency
D Voltage Phase Connection
If any controller on the network is different, none of the
attached generators will close their circuit breakers (the
system is unsure which of the generators are configured
correctly).
Most Decision-Makerr 3500 controlled generators will
ship with 12-lead , reconfigurable alternators. The
connection of the output of the alternator will change the
effective voltage range, neutral connection, and
relationship between the phases.
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