Category: Woodward

FEATURES

 Up to 16 LS-5×2 relays can be operated in one network with up to 32 easYgen-3400XT/3500XT

 Remotely selectable breaker transition modes: Open, Closed (short parallel <100ms), Inter

change, Indefinite parallel

 Software selectable to function as one breaker control

 Internal power calculation with option to feed active power from external transducer

 Phase match or slip frequency synchronization with voltage matching

 Full protection package (including df/dt (ROCOF), phase shift, and mains voltage increasing

protection according to new German grid code)

 Segment control for the load sharing

 Event Log with up to 300 entries

 Automatic date and time synchronization between the LS-5 units and the connected easYgen

3400XT/3500XT controls

 LS-5 “Stand alone” mode without the easYgen-3400XT/3500XT is possible

 Preconfigured application modes that simplify the configuration process for complex multi

breaker applications

 AUTOmatic and MANual mode

 Full remote control via CAN or RS-485 interface

 Breaker open/close failure detection

 Mains decoupling “Test” mode

 Lock keypad feature

 4 freely configurable alarms

 8 Freely configurable LED`s on the LS-512 back panel mountable device

 Multilingual capability: English, German, Spanish, French, Italian, Portuguese, Japanese,

Chinese, Russian, Turkish, Polish

DESCRIPTION

Woodward’s LS-5 Series are synchronizer controllers with integrated mains decoupling and protec

tion features. The applications range from independent synch check relay to complex power man

agement relay with multiple utility feeds, bus tie breakers and group breakers in combination with

Woodward’s easYgen-3400XT/3500XT equipped genset controllers. Wiring efforts are reduced to

a minimum, since only one CAN bus connection is required between all LS-5 and easYgen control

lers to transmit AC measurement signals, I/O states, flags etc.

The LS-5×2 relays simplify the applications where load bus is served by a mains circuit breaker

(MCB) and a generator group breaker (GGB). It senses voltage and current, quantifies the syn

chronization parameters and transmits the signals via CAN bus to the easYgen-3400XT/3500XT

genset controllers. The two breakers control capability along with mains decoupling and protection

features make it a perfect choice for transfer switch control under guidance of an external supervi

sory control. The LS-5×2 is software selectable to be applied as an LS-5×1 thereby facilitating hard

ware standardization to OEM switchgear builders, generator packagers, and system integrators.

The LS-5×2 Series is available in two different mounting styles. An LS-522 with a plastic housing

and graphic LCD display is designed to be mounted on the cabinet’s front door. An LS-512 with an

aluminum powder coated housing without display is designed to be back panel mounted.

Stop/Ratio Valve Operation

The Gas Stop/Ratio Valve actuator is controlled by an electronic servo-control system (not included),

which compares the demanded and actual valve positions. The control system modulates the input

current signal to the electrohydraulic servo valve to minimize the positioning system error. See Figure 1-2

for a functional schematic of the single acting actuator.

Hydraulic oil enters the actuator via a removable element filter with integral high P indicator and is

directed to a four way, electrohydraulic servo valve used in a three-way configuration. The PC1 control

pressure output from the servo valve is directed to the top of the hydraulic piston. When the force

exerted by the hydraulic pressure exceeds the force of the opposing loading springs, the output piston

extends, rotating the valve in the opening direction.

A trip relay valve assembly is interposed between the electrohydraulic servo control valve and the servo

output stage. Loss or reduction of the externally supplied trip signal pressure causes the trip relay valve to

shift position. This connects the upper cavity of the actuator piston to the hydraulic drain. The force

supplied by the return springs pushes the actuation rod up, rotating the valve to the closed position.

Two redundant LVDT position feedback transducers are also mounted within each actuator. An optional

third LVDT is available on the 6” and 8” stop/ratio actuators only. The LVDT sensor cores and support

rods are connected to the main actuator output rod by a coupling arrangement guided on a bushing. This

guide bushing maintains LVDT alignment to minimize core damage due to sliding wear and the

associated loss of sensing accuracy.

Optimum control of the gas turbine requires that the actuator and valve accurately and quickly track the

demand signals transmitted by the control. The stop/ratio valve has been designed to provide output

forces that exceed the opening and closing requirements with some margin. The additional margin helps

ensure that the system moves rapidly even under service conditions where the valve has been

contaminated or worn. The hydraulic trip relay valve has been selected to provide high operating force

margins, high flow capacity, and to ensure the desired closure rate of the valve under trip conditions.

By using a long actuation rod between the hydraulic cylinder and the valve lever arm, the side-loading

forces on the actuator shaft and seals are greatly reduced, decreasing the wear between sliding parts,

and increasing the useful service life of the system. The ample distance between the wetted heavy-duty

linear slide rings within the stop/ratio valve accommodates any remaining side load. These provisions

provide extended service life even in severe service conditions.

General Information

The Woodward Gas Stop/Ratio Valve performs a dual function for industrial or utility gas turbines. One

function rapidly shuts off fuel to the turbine fuel control system. Another function provides accurate control

of gas fuel pressure at the outlet of the stop/ratio valve. This pressure is applied to the inlets of the gas

fuel control valve.

The Gas Stop/Ratio Valve features a modular design and meets critical control characteristics while

allowing the same valve design to accommodate a variety of stroke, force output, and mechanical

interface arrangements. The electrical and mechanical interfaces have been designed for quick and easy

assembly or removal of the valve, at the factory or in the field. The components include an

on-board hydraulic filter, electrohydraulic servo valve, trip valve, single-acting hydraulic cylinder, and dual

LVDTs (the 6” and 8” valves also have the option for triple LVDTs).

The governors are available with either a cast-iron case or a die-cast aluminum case. 

Speed droop is required for stable governor operation. Droop is factory set, but internally adjustable. 

Two means of speed setting are available. Screw speed setting is standard. Lever speed setting is 

optional and provided by a serrated shaft assembly extending from both sides of the cover. 

Governor drive shaft rotation for both governors is single direction only. In both the cast iron and the die

cast aluminum governors, rotation can be changed in the field. In the cast iron governor, it must be 

changed internally, and in the die-cast aluminum governor, it can be changed externally by removing

four screws and rotating the pump housing 180 degrees (see Chapter 2). 

Governor maintenance is minimal due to few moving parts, weatherproof design, and self-contained oil 

supply. The governor drive shaft operates a gerotor oil pump. Internal oil pump pressure is regulated by

a relief valve/accumulator. The oil sight gauge installed on each side of the governor case makes oil 

condition and oil-level checking simple.

Description 

The Woodward TG-13/TG-17 and TG611-13/TG611-17 are mechanical-hydraulic speed droop governors 

for controlling steam turbines—applications where isochronous (constant-speed) operation is not 

required. 

The TG-13/TG-17 and TG611-13/TG611-17 governors have a full 40 degrees of maximum terminal-shaft 

travel. Recommended travel from the no load to the full load position is 2/3 of full governor travel. 

See Figure 1-1 for a graphic representation of maximum work capacity for the governors and related 

governor terminal shaft travel information. 

The TG-13/TG611-13 governor operates with 1034 kPa (150 psi) internal oil pressure, and the TG

17/TG611-17 operates with 1379 kPa (200 psi) internal oil pressure. 

Either governor is set to the speed range specified by the customer at time of order. The high-speed 

governor (4000 to 6000 rpm) may require a heat exchanger in some applications (see end of Chapter 2, 

“When is a Heat Exchanger Necessary?”). Both governors are capable of controlling at lower-than

specified speed range with some loss of output torque and performance. The governor should not be run 

at a speed greater than the range specified because of heat rise and component wear issues.

Features

The actuator output is an ISO 9409 flange. This allows for easy mounting of levers to

simplify replacement. The orientation of the output flange relative to the bracket base

is the same for each actuator. Additionally, the actuators are equipped with break-away

stops that prevent the actuator from exceeding the maximum output travel range

during setup. An output position indicator is standard.

The EM-80 and EM-300 systems include a mounting bracket with hole pattern. The

bracket design ensures that stresses in the actuator are reduced to a minimum.

Actuator specifications and performance are based on a system including bracket.

The actuators are equipped with a flying-lead position-sensor cable (including connector).

A position sensor cable connecting the actuator and the driver is available.

This cable is similar for both the EM-80 and the EM-300.

A single EM-driver is used for both the EM-80 and the EM-300. Only the software

setup for each actuator system differs. Monitoring, alarm, and diagnostics are available.

An EMI power filter is supplied to suppress emissions.

Optional Features

The EM-80 and EM-300 systems include a bracket for mounting on the engine or turbine.

A standard mounting hole pattern is provided. Alternative patterns are available on request.

Applications

The EM-80 and EM-300 are intended to be mounted on large diesel, gas, and

gasoline engines, and on all types of turbines, to control the position of engine fuel

racks, turbine fuel valves, turbine and turbocharger variable geometry, and to handle

timing control. These systems are well suited for engines without a mechanical drive

or hydraulic oil supply.

Description

The EM-80 and EM-300 are all-electric actuator systems that provide 40 degrees of

actuator output rotation. Each system consists of a three-phase brushless ac motor

which drives a high-precision planetary reduction gear box. A dedicated driver

controls the actuator position and allows monitoring of most features.

PC/Windows based software facilitates the system setup. The EM-80 and EM-300

are freely programmable to meet many customer requirements.

 Fast slew times

 Freely programmable

 Brushless servomotor and resolver

 Precision gearbox, high stiffness, low backlash

 CE marking

 Models with ABS, BV, and DNV certification

 Cost effective solution

The EM-80 and EM-300 actuators have different position-sensing systems. Both

systems use the same hollow shaft resolver, producing a sine and cosine wave

output with an overall accuracy of 12 arc-minutes. This resolver is mounted at the

rear of the motor and looks at the relative position of the motor shaft.

The EM-80 uses only the resolver since the 1:7 gear ratio within the gearbox

allows full stroke of the actuator output flange with less than one full revolution of

the motor shaft.

The EM-300 has a 1:20 gearbox ratio to achieve the required torque output.

Because of this, the motor shaft rotates more than one full revolution to achieve

full stroke. To ensure proper position indication over the full range, a 10-turn

potentiometer is added behind the resolver to supply a coarse position signal

from which the correct rotor revolution is deduced. The same resolver as used on

the EM-80 gives the accurate position within that revolution.