Paralleling Basics; Why Parallel Generator Sets; Paralleling Functions - Kohler 14EKOZD Installation Manual

Decision-Makerr 3500 Controller Features
Include:
Isochronous (real and reactive) load sharing with other
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Decision-Makerr 3500 equipped generator sets.
Random first-on logic to prevent two or more
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generator sets from closing to a dead bus.
Automatic synchronizer with dead bus closing.
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Soft loading and unloading.
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Protective relay functions include:
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Loss of field
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Over current
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Over frequency
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Over power
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Over voltage
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Reverse power
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Under frequency
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Under voltage
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Generator management
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generators to be stopped to conserve fuel.
Load control logic permits prioritization of supplied
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loads, allowing critical load to retain power in a failure
scenario.
A generator set needs to be configured and set up
correctly to work in paralleling applications. This section
covers:
Paralleling Basics (see Section 9.1)
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Paralleling Considerations (see Section 9.2)
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Paralleling Set Up (see Section 9.3)
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Paralleling Troubleshooting (see Section 9.4,
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Section 9.5, and Section 9.6)
Generator Management Setup (see Section 9.7)
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Load Add/Shed Configuration (see Section 9.8)
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9.1 Paralleling Basics

9.1.1

Why Parallel Generator Sets

Some reasons to parallel generator sets are:
Redundancy
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Increased power capacity
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Decreased fuel consumption
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Reduced chance of wet stacking/fuel on water
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Increased reliability
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Greater flexibility
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Individual generators can be serviced in prime power
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applications
56 Section 9 Paralleling Generator Sets
allows unneeded
9.1.2

Paralleling Functions

There are two methods of paralleling:
1. PGEN. The Decision-Makerr
full-featured paralleling controller.
integrated control for synchronizing, load sharing,
protective relays, generator management, and
load add/shed. This functionality is performed
automatically by the Decision-Makerr 3500
controller. PGEN requires an RS-485 between
each of the paralleling generators for paralleling
operation.
2. Remote Speed and Voltage Bias.
Decision-Makerr 3500 controller is also capable of
accepting a speed and voltage bias from an
external paralleling control. In these applications,
the external paralleling control performs all of the
required functionality and the Decision-Makerr
3500 controller merely provides a control interface
and protective functions for the generator set.
Note: For external speed and voltage bias, the
PGEN communication's cable should
not be connected between generators.
TB13 is located inside the junction box and
contains the connection points for external speed
and voltage bias control and accommodates 0--5
volt input for active control. See the table below
and the wiring diagrams in the Operation Manual
for more information.
Speed Bias Negative (--)
Speed Bias Positive (+)
Voltage Bias Negative (--)
Voltage Bias Positive (+)
External paralleling requires the external speed
and voltage bias inputs to be enabled. Using
SiteTecht, under the Synchronization Control
parameter change the setting to the following:
External Bias Inputs:
Note: For more information on SiteTecht, see
TP-6701 SiteTecht Software Operation
Manual.
3500 is a
It offers
The
Connection
TB13-SBN
TB13-SBP
TB13-VBN
TB13-VBP
True
TP-7045 3/18c