Month: December 2025

APPLICATION

The Woodward DSLCTM control is a

microprocessor-based synchronizer and load

control designed for use on three-phase AC

generators equipped with Woodward or other

compatible speed controls and compatible

automatic voltage regulators. The DSLC is a

synchronizer, a load sensor, a load control, a

dead bus closing system, and optionally a

VAR/PF and process control, all integrated

into one powerful, yet convenient package.

The DSLC control provides either phase

matching or slip frequency automatic

synchronizing. The DSLC talks over its own

LON (using Echelon®  LonWorks™* network

technology) to enable safe dead bus closing,

and ties into your automatic voltage regulator

to match voltages before paralleling.

The DSLC control senses true rms power and

provides bumpless loading and unloading

functions.  It can either base load or set

import/export/process power levels against the

utility, and through the DSLC’s LON,

accurately share loads on isolated, multi-engine

systems.

The optional VAR/PF control is flexible

enough to allow you either to provide a set

level of VARs to the utility (if this is

economical) or to maintain a constant power

factor for reliable operation.  Through the

LON, the VAR/PF control also shares power

factors in isolated systems, maintaining

proportional reactive loads (kVARs) on all

machines more accurately than droop or cross

current voltage systems.

General:

The DSLC-2XT/MSLC-2XT is an upward compatible successor device for the DSLC-2/MSLC-2.

They are based on the easYgen-3400XT-P2 hardware. It is designed to function

as good as the original DSLC2/MSLC-2 (version 1.1511).

The new generation is equipped with a more powerful CPU, memory, and communication.

It is more responsive in HMI and SCADA communications.

The important control functions run on the same task rates that ensures the same control dynamic.

Most important, it is being designed to be able to run with the legacy DSLC-2/MSLC-2 system.

This becomes more important than ever due to lack of obtainable components that may

force us to make a hard stop to the DSLC-2/MSLC-2 product line later this year.

If some minor rules are observed the DSLC-2XT can be mixed with already existing DSLC-2 / MSLC-2 in an

application.

MSLC-2XT (in line with DSLC-2XT) is also in preparation and comes few months after DSLC-2XT.

Others:

The communication 9-pin D-sub connectors are replaced by phoenix plugs with screw terminals

The analog outputs 1 & 2 are supported with two terminals now (the shunt for voltage output is internally

populated)

Schedule:

DSLC-2XT: Design release to production scheduled for Sept’22.

Shipment expected Oct’22 however depends on availability of components.

Limited early sample and draft manual available. Please contact your account manager.

MSLC-2XT: Design release to production scheduled for Nov’22.

Shipment expected Dec’22 however depends on availability of components.

Limited early sample and draft manual available. Please contact your account manager.

Part Numbers:

8440-2298: MSLC-2XT

8440-2299: DSLC-2XT

Important Considerations:

Communicating with legacy DSLC-2 (and MSLC-2)

Woodward will provide update files for legacy DSLC-2 and MSLC-2 devices in the field if

there is to run a mix of both DSLC-2/MSLC-2 generations. 

The legacy device will then send their UDP messages in a way that DSLC-2XT/MSLC-2XT can evaluate.

It is mandatory to load this update file into the legacy devices for the system to run smoothly.

2. Using your existing settings file (*. WSET) from legacy DSLC-2 (and MSLC-2)

Woodward will provide a conversion rule for ToolKit to make the configuration transfer as smooth as

possible.

Some minor parameters will be shown in a log file, to be evaluated manually.

3. The AC measurement of the DSLC-2XT (and MSLC-2XT)

The measurement hardware and software are different in comparison to the legacy devices.

This is mainly due to higher accuracy, more flexible measurement range and fast response characteristics.

The earthing of the DSLC-2XT/MSLC-2XT devices has become more important due to higher impedance

of the measurement circuits.

4.ToolKit

To give you a seamless transition experience, the ToolKit layout (*. WTOOL file) is designed like the

original devices.

There are few less parameters due to new AC measurement and communication interfaces.

5.Documentation server

Product literature (manuals, config. files, software etc.) is hosted on a documentation server

that is easily accessible by a QR code printed on the housing. 

Two additional QR stickers are delivered with the controllers to help you paste them at a location

convenient to you.

Subsequently, product CD is removed from scope of delivery.

.Woodward understands the time-intensive nature of Power Generation projects.

Ensuring the longevity of our products is one way we make our customers successful.

Woodward has supplied and supported the field proven MSLC-2/DSLC-2 line of 

synchronizers and load controllers for over a decade.

An upcoming state of the art Drop-In replacement successor extends the life cycle of this product line for

another decade and possibly beyond. This document provides an overview of what to expect from the

successor products,namely MSLC-2XT/DSLC-2XT respectively.

Important Features:

→  Drop-In Replacement (Mounting dimensions and overall dimensions are same)

→  Similar Look and Feel as MSLC-2/DSLC-2 (available in back panel mounting style)

→  USB Connectivity to PC (RS-232 port is removed; new: USB Type B)

→  Direct connect up to 690VAC (increased range handled by device configuration)

→  Software selectable 1A/5A CT input (supported by one P/N)

 Applications for up to

32 generators with

16 mains and/or tie

breakers

 Configurable for mains

and tie breaker

applications

 Complex applications

with up to 8 bus

segments

 Automatic segment

recognition

 Redundant Ethernet

communication for

enhanced reliability

 The “system update”

feature allows for

system reconfiguration

 PLC and DCS compati

ble via Modbus RTU or

Modbus TCP

 Automatic plant loading

and unloading for bump

less load transfer to and

from the utility

 Controls plant wide

import/export levels

against the utility

 Overall plant Power

Factor control

 Ethernet or RS-232 port

for configuration of

device using Woodward

ToolKit software

 UL/cUL & CE Listed

FEATURES

 One MSLC-2 can provide master control for up to 32 DSLC and an additional 15 MSLC-2 in a system.

 Two dedicated Ethernet lines for precise system communications between all DSLC-2’s and

MSLC-2’s on the system.

 Ethernet Modbus TCP for remote control and monitoring by PLC or DCS system.

 Redundant Ethernet communications for enhanced reliability.

 Master MSLC-2 redundancy, loss of communications with the designated MSLC-2 master initiates

control hand off to the next designated MSLC-2 master.

 The MSLC-2 hardware is adjustable for multiple applications.

 Slip frequency or voltage phase matching synchronizing fully selectable with dead bus option in both

directions provide full flexibility for intertie and main-tie-main applications.

 Having functions integrated into one box eliminates the need for redundant sensors (like PTs, CTs, and

MOPs) that connect to individual modules such as the load sensor and synchronizer.

 Digital signal processing makes the MSLC-2 resistant to power line distortions and harmonics.

 Three-phase true RMS power sensing provides accurate readings even with unbalanced phase loading

and voltage fluctuations.

 Export/import control over multiple utility MSLC-2’s in same segment.

 The Woodward ToolKit™ software allows flexible setup using the same basic menu tree as the original

MSLC plus an overview screen. No hand held programmer is required. Graphical overview of generators

and bus bar parameters with trending makes the MSLC-2 commissioning friendly.

 The Toolkit can be accessed either via one of the Ethernet ports or via RS-232 port.

 Phase angle compensation provides adjustment for additional deviation correction across a

transformer.

 The system update feature allows for system reconfiguration.

The MSLC-2 provides phase matching or slip frequency synchronization, with voltage matching,

across a utility or intertie breaker. The MSLC-2/DSLC-2 combination can handle multiple utility con

nections with a maximum of 8 bus segments in one application.

The MSLC-2’s load sensor and load control sense true RMS power and provide a bump-less load

ing and unloading against a utility grid. Baseload, import/export, process, and utility unload modes

control the KW power between different power sources at the same time controlling the reactive

power, VAR and power factor.  Reactive power is also ramped on and off for the smoothest load

transactions between power grids.

The MSLC-2 communicates via Ethernet, with redundant Ethernet now available, to control real

and reactive loading against the utility by DSLC-2 equipped generators.

The tie breaker mode allows synchronization between multiple generator systems. Segments are

connected and power can be measured across an intertie, but no load control is functional when in

Tie breaker operation.

DESCRIPTION

Woodward’s MSLC-2™ functions with the DSLC-2™ control to provide synchronization and load

control across Utility and Intertie breakers. The MSLC-2/DSLC-2 combination operates over an

Ethernet communication network to control simple or complex generator system applications. This

combination, 32 DSLC-2’s and 16 MSLC-2’s,  provide multiple unit, multiple segment, utility and

intertie power management for complex power systems. Controls plant wide Import / Export levels

while always providing bump-less load transfers with utility.

The MSLC-2 control combines synchronization, dead bus closing, utility/intertie load sensor, base

load control, import/export control, VAR, power factor, and a master process control in one power

ful package.

The MSLC-2 provides phase matching or slip frequency synchronization, with voltage matching,

across a utility or intertie breaker. The MSLC-2/DSLC-2 combination can handle multiple utility con

nections with a maximum of 8 bus segments in one application.

Novidades

 Conexão direta até 690VCA

 Selecionável via Software a entrada de TC 1A/5A

 Isolamento de hardware aprimorado

 Três portas de comunicação Ethernet

 Substituição direta*

Aplicações para até 32 geradores com 16 disjuntores de Rede/TIE

• Aplicações complexas com até 8 barramentos

• Redundância na divisão decarga kW e kVAr por Ethernet

• Cinco portas de comunicação:

3 Ethernet, RS-485 e USB.

• A função “system update” permite remover ou adicionar geradores ao sistema.

• Transferência de carga suave automática do gerador

• Divisão de Carga (isócrono) com outros geradores controlados pelo DSLC-2XT

• Controle de Carga em Base de Carga e Controle de Processo

• Controle de Var ou Fator de Potência

• Fechamento em Barra morta

• Compatível com PLC e DCS

• O hardware do DSLC-2XT é configurável para atender a diversos Reguladores de Velocidade,

Reguladores de Tensão e Transformadores de Potencial

• Range de aplicação 999.999.9 MW

• Certificados UL/cUL, CE e ABS

CARACTERÍSTICAS

• Rede Ethernet dedicada para comunicações precisas do sistema entre todos os DSLC-2XT e MSLC-2XT

reduz o cabeamento do sistema.

• Ethernet Modbus TCP, e Modbus RTU, para controle e monitoramento remoto.

• Comunicação redundante via Ethernet para maior confiabilidade.

• O recurso System Update permite a remoção ou adição de geradores do sistema.

• A funcionalidade do sistema integrado DSLC-2XT e MSLC-2XT elimina a necessidade de sensores

redundantes (como TPs, TCs e MOPs) conectados a módulos individuais como transdutores de potência e

sincronizadores.

• A montagem em fundo de painel e um tamanho reduzido libera espaço na porta do painel e

proporciona fácil cabeamento.

• Elimina a necessidade por lógica de relé adicional para controlar o fechamento de barra morta.

• Paralelismo com escorregamento de frequência, equalização de tensão, e controle de velocidade na

transferência entre sincronização e controle de carga resultam em um paralelismo suave sem o risco de

desligamentos por potência reversa.

• A medição de potência trifásica TRUE RMS torna o controlador DSLC-2XT preciso mesmo com

desbalanceamento de fase e flutuações de tensão.

• Correção do ângulo de fase/grupo de ligação para o disjuntor do gerador GCB quando um

transformador é incluído no sistema.

• O software ToolKit™ da Woodward permite configuração flexível usando a mesma estrutura de menu

básica que o DSLC-2 original, além de uma tela de visão geral. A visão gráfica geral dos parâmetros do

gerador e barra torna a comissionamento do DSLC-2XT intuitivo. Todos os dispositivos Woodward podem

ser programados a partir de uma única conexão com a rede.

• O ToolKit pode acessar o controlador através de uma das portas Ethernet ou através da porta USB.

* A Woodward disponibiliza os arquivos de atualização legacy do DSLC-2 para operação conjunta com o

novo DSLC-2XT