GE 151X1212HB01MG02 Integrated LCI Controller (Old Model)

151X1212HB01MG02  Integrated LCI Controller (Old Model)

Self Test

When power is applied to the drive, the following control hardware checks are

performed to ensure proper drive operation:

• CPU test

• PROM check sum

• RAM test

• Writing/ reading to each board on the VME backplane

The control is designed with test features that are able to isolate problems to a

replaceable unit. Control cards feature loop-back test capability that allows the

processor to test the board operation without requiring generator operation. All

cables are monitored for continuity.

Only the 14 MVA Static

Starter will have redundant

thyristors.

Tuning changes are seldom

necessary during

commissioning.

All thyristors are individually monitored for proper conduction status.  In drives with

redundant thyristors, this allows safe operation of the drive to continue with one

shorted thyristor until maintenance is performed.

The control is capable of running a test on the entire drive in which current is

circulated through the bridges but bypasses the generator. This allows proof of drive

readiness without requiring power on the generator.

Software Configuration

The Static Starter control is configured with the Control System Toolbox (toolbox).

The toolbox is a Microsoft Windows® based software package that typically resides

on the HMI and communicates to the Static Starter through Ethernet.

Having a digital control system permits fast field tune-up by allowing regulator gains

and time constants to be changed by changing a parameter in non-volatile memory.

The factory settings are specific to the site application. Control tune-up constants

that may be changed include:

• Current regulator

• Speed regulator

• Flux regulator

• System protection

• Scaling factors

• Data logging list

Communications

The LS2100 supports Ethernet local area network (LAN) communication to:

Mark VI, Mark VI ICS, EX2100 Static Exciter, Changeover Panel, and HMI

using the Ethernet global data (EGD) protocol

GE Control System Toolbox

The Onsite CenterSM for remote monitoring and diagnostics

Applications

Also, during starting, the field

voltage setpoint for the

exciter is provided by the

Static Starter control to

regulate generator stator

terminal voltage.

60

During startup, the Mark VI turbine control supplies the run command and speed

setpoint signals to the Static Starter control. The Static Starter control operates the

power converter in a closed loop mode to deliver variable frequency current to the

generator stator. By controlling generator field voltage and stator current, the Static

Starter is able to adjust the torque produced by the generator and thus control the

acceleration and speed of the turbine-generator set.

Gas Turbine Startup Sequence

Initially, the gas turbine-generator set is spinning at turning gear speed, typically 3 to

6 rpm.  At startup, the Static Starter connects to the generator stator and assumes

control of the exciter field voltage reference. The Static Starter then accelerates the

turbine to the purge speed setpoint (typically 25% of synchronous speed). The

turbine is held at purge speed for approximately six minutes.  Following the purge,

the Static Starter output is turned off and the turbine is allowed to coast down to the

firing speed of 15%. Once at firing speed, the output is turned on again and the

turbine is fired. The turbine is briefly held at constant speed to allow for warming.

Once the warming period is completed the Static Starter accelerates the turbine to its

self-sustaining speed, at which point the  is turned off and disconnected from the

generator.