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computer MAX

Instruction Manual

2.2.- STARTING SCREEN

When the computer MAXisstarted(justaftersupplyconnection)the

screen shows a code indicating the device version. It’s important to

indicate this code in case of reporting any device fault or error.

2.3.-DEFINITIONS

Inthissectionweshallgiveseveraldenitionswhichwillbeusefultounderstandseveralsec-

tions of this manual.

2�3�1�- FOUR QUADRANT REGULATORS

This term is used to describe the regulators which are able to perform measure and control,

eitheriftheactivepowerowsfromtheutilitytothecustomernetwork(thecommoncaseofa

consumingfacility)orifitowsinthereversesense.Thelateristhecaseoffacilitiescontaining

power generation equipment which export some amount of generated power to the utility.

2�3�2�- FCP PROGRAM (FAST COMPUTERIZED PROGRAM)

The devices having FCP program, control the switching of capacitor stages in order to minimize

the number of switching operations to reach the required PF compensation. Moreover, the

program assigns the capacitor stages to be connected or disconnected using a FIFO criterion

(FIFO=FirstIN,rstOUT),thatwaythetimesofuseofallstagesareequalized.

2�3�3�- STAGES AND STEPS

We must distinguish between these two terms.

In this manual we call stage to each of the capacitor groups that constitute the PF correction

device. The capacitor stages in PF correction equipment may have all the same power or not,

as explained in the following paragraphs.

The term step is used to describe the minimum fraction of reactive power in which the PF cor-

rection equipment is divided. Usually this is the power of the lower stage.

2�3�4�- STAGES RATIO PROGRAM

Powers of successive capacitor stages in PF correction equipment generally follow certain

patterns called stages ratio program or simply “Program”. The stages program indicates the

relationship between the different capacitor stage powers. Most common stages ratio programs

are the as follows:

Program 1:1:1 �Allcapacitorstageshavethesameratedpower(kvar).Forinstance,a5-stage

device of 100 kvar would be formed by 5 equal stages of 20 kvar and would be described as a

deviceof(5x20)kvar.

Program 1:2:2.Allcapacitorstagesfromthesecondanduphavearatedpower(kvar)whichis

twicetheratedpowerofrststage.Forinstance,a5-stagedeviceof180kvarwouldbeformed

byarststageof20kvarand4equalstagesof40kvar,andwouldbedescribedasadevice

of(20+4x40)kvar.

Circutor computer MAX 12 User Manual

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