Woodward: easYgen-3500XT-P1-LT 8440-2086

Product number: 8440-2086

Manufacturer product number: 8440-2086

Description: Woodward: easYgen-3500XT (P1/LT), Genset Controller, 1A/5A, Package 1. Low Temperature (-40 °C to 70 °C)

Operation of the circuit breakers

External breaker handling

The configuration of pulse switching takes place in the following

screen and has the described effect on the signal sequence (the

MCB cannot be controlled by the continuous pulse for security rea

sons, because otherwise, the MCB would be opened in case of a

failure/exchange of the easYgen).

The parameter "Enable MCB" allows/prevents the closing of the

MCB. A closed MCB will not be opened.

If the parameter "Auto unlock" is configured to YES, an open pulse

will be issued prior to each close pulse.

In operation mode AUTO the easYgen operates its breakers auto

matically according to the configured application and transition

modes. Actually the breaker transition mode “external” would only

allow the breaker closure from external. On the other hand the

easYgen allows in special cases the closure of breaker from

external, when the following configurations and modes are fulfilled

External Breaker

Handling

Synchroni

zation

Mode

Dead Bus

Closure

Condition for the closure

acceptance

GCB Synchroniza

tion

Off-n The start request in auto

matic is active

n The generator is in oper

ating range

n The engine start procedure

is expired

GCB Dead bus

closure-Off

MCB Synchroniza

tion

Off-The mains is in operating range

GCB Dead bus

closure-Off

... and if GGB is available:

GGB Synchroniza

tion

Off-Minimum 1 GCB is closed

GGB Dead bus

closure-Off

The easYgen provides some application modes, which contain the

handling of the breaker control LS-5. According to the application

mode a single LS-5 or a system of LS-5s is installed. The LS-5

technology shall give the designer an instrument to handle more

complex breaker applications.

Here are some feature examples of the LS-5 technology:

n Open/close of individual breakers including synchronization

and dead bus closure.

n Determining the generators in load share segments.

n Loading/unloading active and reactive power via the dedicated

breaker.

n 3-phase power measurement at the interchange point to the

utility.

n Included mains decoupling functions.

The unit closes the GCB without synchronization, if the following

conditions are met. The display indicates "GCB dead bus close".

Automatic operation

n The operating mode AUTOMATIC has been selected

n No class  C alarm or higher is present

n The engine is running

The engine delayed monitoring (parameter 3315 Ä p. 167) as

well as the generator stable time (parameter 3415 Ä p. 221)

have been expired or the LogicsManager function "Undelay

close GCB" (parameter 12210 Ä p. 221/Ä p. 905) is enabled

n The generator voltage and frequency are within the configured

operating range ( Ä Chapter 4.5.1.1 “ Generator Operating

Ranges: Voltage / Frequency / Busbar” on page 308)

n The MCB has been opened for at least the time configured in

"Transfer time GCB↔MCB" (parameter 3400 Ä p. 218)

(Mode , , ,  and  with open transition mode

only)

n The function "Start without load" (parameter 12540 Ä p. 284/

Ä p. 906/Ä p. 906) has been disabled through the Logics

Manager

n Only in critical mode: the parameter "Close GCB in override"

(parameter 4100 Ä p. 292) is configured to "Yes"

n The busbar voltage is below the dead bus detection limit

(parameter 5820 Ä p. 424)

n There is no other GCB closed in the same segment

n There is no other device with a smaller device ID willing to

close its GCB too (Dead busbar closure negotiation)

Manual operation

n The operating mode MANUAL has been selected.

n No class  C alarm or higher is present.

n The engine is running.

n The engine delayed monitoring (parameter 3315 Ä p. 167) as

well as the generator stable time (parameter 3415 Ä p. 221)

have been expired.

n The generator voltage and frequency are within the configured

operating range ( Ä Chapter 4.5.1.1 “ Generator Operating

Ranges: Voltage / Frequency / Busbar” on page 308).

n The button "Close GCB" has been pressed.

n The MCB has been open for at least the time configured in

"Transfer time GCB↔MCB" (parameter 3400 Ä p. 218).

(Mode , , ,  and  with open transition mode

only)

n The busbar voltage is below the dead bus detection limit

(parameter 5820 Ä p. 424).

n There is no other GCB closed in the same segment.

n There is no other device with a smaller device ID willing to

close its GCB too (Dead busbar closure negotiation).

Dead Busbar Negotiation

Each easYgen, who intends to close its GCB on a dead busbar

publishes a “Dead busbar closure request” flag over CANbus and

reads back whether there is any other easYgen publishing the

same intension:

If not, the unit waits an estimated time for security and then closes

its breaker.

If yes, the unit compares its own device number with the smallest

device number of all others who also intend to close. If the own

device number is smaller than the rest, the unit will close its

breaker - otherwise it blocks its own closure.

The easYgen removes its wish to close its GCB on a dead busbar,

if the GCB closure failure occurs in a multiple generator applica

tion. So the next easYgen with the higher device number gets the

permission for closure.