Category: Industry Trends

OPERATING MODES

Isolated Bus — The DSLC talks over its LON to share

proportional real and reactive loads.  Real load (kW) is

controlled using percentages of full load for each machine,

and reactive loads (kVAR) are

shared by matching power factors.

The DSLC maintains a specified

bus voltage and frequency while

balancing loads.

Utility Parallel — The DSLC

measures real load (kW) on the

generator and adjusts the speed

control to match a set base load, to

control a process at a user-chosen,

externally adjustable setpoint.  Or it

can set a constant import/export

level using an MSLC ( Master

Synchronizer and Load Control).

The DSLC can also measure and

maintain a set reactive load (kVAR)

or can maintain a user-prescribed

power factor.

Transition Between Modes — The

DSLC will ramp at a user-chosen

rate from one mode to another

until the control is within 5% of its

target. It then shifts into dynamic

control, allowing bumpless

operating mode changes. In

addition, the DSLC automatically

changes its VAR/PF mode when

the real load mode is changed to or

from an isolated bus, load sharing

mode. Manual VAR/PF control

may also be selected.

ADVANTAGES

• Reduces wiring between synchronizer, load

control and automatic loading controls

• 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

• Hand Held Programmer reduces installation

and calibration time by allowing the user to

set up the control prior to starting the system

• Hand Held Programmer lets operator monitor generator

parameters, contact switches, and analog I/O for

installation and troubleshooting

• Reduces the amount of cabinet space needed

• Eliminates the need for additional relay logic or a PLC to

control dead bus closing

• Digital communications across the LAN reduce

susceptibility to noise on the load sharing lines

• Slip frequency paralleling, voltage matching, and speed

bias hand-off between the synchronizer and load control

result in smooth paralleling without the risk of reverse power trips

• Three-phase true rms power sensing makes the DSLC

accurate even with unbalanced phase loading and voltage fluctuations

• Can load share with Woodward analog controls when

used with the Load Sharing Interface Module. Refer to

Woodward Manual # 02031 for details.

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.