Power factor regulators

computer MAX 6 / computer MAX 12

Instructions Manual

( M98228201-03-14A)

M98228201-03-14A

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MAX

6 / computer

MAX

12

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MAX

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Index

______________________________________________________________

1

 

INTRODUCTION AND SAFETY RECOMMENDATIONS ....................................................................... 4

 

1.1

1.2

1.3

 

 

D

S

ELIVERY SPOT CHECK

TARTING SCREEN

.................................................................................................................................... 4

........................................................................................................................................... 5

 

D

EFINITIONS

.................................................................................................................................................... 5

 

 

 

1.3.1

 

Four quadrant regulators ...................................................................................................................... 5

 

1.3.2

 

FCP program (FAST Computerized Program). .................................................................................... 5

 

1.3.3

 

Stages and steps .................................................................................................................................... 5

 

1.3.4

 

Stages ratio program ............................................................................................................................. 5

 

1.3.5

 

Plug & Play. .......................................................................................................................................... 6

 

2

 

GENERAL CHARACTERISTICS .................................................................................................................. 6

 

3

 

FRONT PANEL: SCREEN AND KEYBOARD ............................................................................................. 7

 

3.1

3.2

 

D

ISPLAY SCREEN

............................................................................................................................................. 8

 

 

M

EASURED PARAMETERS

................................................................................................................................ 8

 

3.3

3.4

3.5

 

 

E

A

RRORS AND

ERROR

LARM RELAY

MESSAGES

.................................................................................................................... 8

................................................................................................................................................. 8

 

R

EGULATOR STATUS AND KEY FUNCTIONS

...................................................................................................... 9

 

 

 

3.5.1

 

Key functions in normal RUN status. .................................................................................................... 9

 

3.5.2

 

Key functions in SET-UP status. ........................................................................................................... 9

 

4

 

INSTALLATION AND START UP .............................................................................................................. 10

 

4.1

4.2

 

T

ECHNICAL

C

HARACTERISTICS

..................................................................................................................... 10

 

 

DEVICE INSTALLATION .......................................................................................................................... 11

 

4.2.1

 

Mechanical Installation ....................................................................................................................... 11

 

4.2.2

 

Connections ......................................................................................................................................... 11

 

4.2.3

 

Cabling cross sections and protections ............................................................................................... 12

 

4.2.4

 

Schematics ........................................................................................................................................... 12

 

5

 

CONFIGURABLE PARAMETERS .............................................................................................................. 13

 

5.1

5.2

5.3

 

 

P

T

LUG

&P

LAY FUNCTION

ARGET COSΦ

................................................................................................................................. 13

................................................................................................................................................ 13

 

S

MALLER AVAILABLE CAPACITOR STEP

......................................................................................................... 13

 

 

 

5.4

5.5

5.6

5.7

 

 

 

C/K

PARAMETER CALCULATION

.................................................................................................................... 14

 

 

S

TAGE

’

S

C

ONFIGURATION OF

PF

CORRECTION EQUIPMENT

(C

ONFIGURATION PROGRAM

) ............................ 14

 

C

S

ONNECTION AND RE

-

CONNECTION TIME SETTINGS

ELECTION OF THE NUMBER OF STAGES

: ..................................................................................... 15

. ........................................................................................................ 15

 

 

5.8

5.9

 

U,I

PHASE ANGLE SETTING

............................................................................................................................. 15

 

 

P

ROGRAMMING THE

CT

RATED CURRENT

(

PRIMARY

). .................................................................................. 16

 

6

 

SET-UP MENU AND PROCEDURE. ........................................................................................................... 16

 

6.1

 

H

OW TO ACCESS THE SET

-

UP MENU

. .............................................................................................................. 16

 

6.2

 

N

AVIGATION SCHEMATIC

. ............................................................................................................................. 17

 

7

 

RUN STATUS .................................................................................................................................................. 18

 

7.1

7.2

 

F

UNCTIONS OF THE DEVICE IN NORMAL

RUN

MODE

. ..................................................................................... 18

 

 

C

OMPUTER

MAX

BEHAVIOUR IN

ALARM

MODE

......................................................................................... 19

 

8

 

MAINTENANCE ............................................................................................................................................ 19

 

9

 

TECHNICAL SERVICE ................................................................................................................................ 19

 

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1 INTRODUCTION AND SAFETY RECOMMENDATIONS

CIRCUTOR S.A. would like to thank you for showing your trust by choosing one of our Computer

MAX series regulators. These units are constructed with the latest state-of-the-art technology, including a powerful processor to calculate the optimum algorithms for achieving the best compensation of cosφ.

The units comply with the Electrical Safety Standard EN 61010, in accordance with the requirements of the Low Voltage Directive (LVD) 73/23/EC and EMC Directive (2004/108/EC) and, therefore, they are certified to carry the CE mark.

This user manual describes the operation of the

Computer

MAX the procedures required to install, commission and operate the units. series regulators and shows the user

SAFETY

CAUTION!

The installation and maintenance of the unit must be performed by duly trained and authorised staff and in accordance with the national and international standards. Any inappropriate manipulation or use of this equipment out of the conditions specified by the manufacturer may involve serious dangers to the user.

DANGER!

Before performing any maintenance operation on the Computer and associated PF compensation equipment, be sure to disconnect the main switch. After disconnecting the switch, wait at least 5 minutes to ensure that the capacitors are totally discharged.

During the installation, maintenance or commissioning of equipment regulated by a Computer

MAX

unit, the following safety precautions must be observed:

 Before connecting the equipment make sure that the earth terminals have been properly connected.

A defective earth connection may cause a wrong operation of equipment and involves a danger of electric shock to the user or system operator.

 Maintenance must be performed taking the necessary precautions to avoid electrocution and electric shock. Ensure that the unit has been disconnected and wait the necessary time to ensure that the capacitors are totally discharged before any maintenance action. We recommend the use of safety goggles and gloves when cabinet doors are open and protection covers removed.

 If a PF compensation unit is connected to mains and capacitors are accidentally connected without load, a resonance may occur. In such condition voltage harmonics may be amplified, cause overvoltage and damage the compensation unit and other equipment connected to the mains.

 The start-up and interruption procedures indicated in the manual must be followed to avoid damaging the PF equipment and/or other equipment connected to mains.

 The adjustment or replacement of components or parts of the unit must be made with original replacement parts and in accordance with the procedures described in the corresponding instruction manual.

1.1 Delivery spot check

After unpacking the equipment check the following points:

 Check that equipment has not suffered any damage during transport.

 The equipment corresponds to type you ordered. (See label at the rear face, fig. 1.1)

 Check that the characteristics in the label are suitable for the site where the regulator has to be installed. (Supply voltage and frequency, measuring range, etc.)

 Follow the instructions in section 3 for installation and set-up.

 If you may observe any anomaly during the installation or set-up, contact with CIRCUTOR, technical service.

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Fig. 1.1.- Rear face label

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.

1.3 Definitions

In this section we shall give several definitions which will be useful to understand several sections of this manual

1.3.1 Four quadrant regulators

This term is used to describe the regulators which are able to perform measure and control, either if the active power flows from the utility to the customer network (the common case of a consuming facility) or if it flows 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.

1.3.2 FCP program (FAST Computerized Program).

The units 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, first OUT), that way the times of use of all stages are equalized.

We must distinguish between these two terms. In this manual we call STAGE to each of the capacitor groups that constitute the PF correction unit. 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 correction equipment is divided. Usually this is the power of the lower stage.

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:

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

100 kvar would be formed by 5 equal stages of 20 kvar and would be described as a unit 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 first stage. For instance, a 5-stage unit of 180 kvar would be formed by a first stage of 20 kvar and 4 equal stages of 40 kvar, and would be described as a unit of (20 + 4 x 40) kvar.

Program 1:2:4. The rated power of the second stage is twice the rated power of the first stage and the rated power of third stage and up is 4 times the power of the first stage. For instance, a 5-stage unit of

300 kvar would be formed by a first stage of 20 kvar, a second stage of 40 kvar and 3 equal stages of 80 kvar, and would be described as a unit of (20 + 40 + 3 x 80) kvar.

Other switching programs. Other switching programs are also commonly available, like 1:2:2:4 or

1:1:2:2, etc. Abbreviated designation form, as can be deduced from previous cases, consists of a sequence of numbers giving the relationship between the different stage powers (kvar), and the first stage power, which value is taken as unit (1 ). The successive stages will be designated by 1, or 2 or 4, etc. meaning that the kvar ratio of such stages with regard to first stage are equal, twice, four times, etc.

1.3.5 Plug & Play.

When a reactive energy regulator is installed, a series of parameters must be configured for its correct operation. Some of these parameters might be hard to know, such as, for example, the voltage phases or the voltage corresponding to the current measured, as well as the current transformer ratio. The

Computer MAX features a smart automatic process that detects the necessary parameters, such as:

- C/K: calculates the ratio between the current transformer and the power of the smallest step.

- Phase: identifies the phase sequence between voltages and the correspondence with the connected current.

The power factor regulators, of types Computer

MAX

6 and

MAX

12 measure the cos φ

(sometimes called Displacement Power Factor,

DPF) in a supply network and control the connection and disconnection of power capacitors in order to regulate such parameter.

The difference between the two types is the number of output relays, which determines the number of stages that they can control.

Type computer

MAX

6

MAXimum Nr of output relays

6 relay outputs

computer

MAX

12

12 relay outputs

Among the most important features of this PF regulator series we can stand out the following:

-

FCP regulation system, which minimizes the number of switching operations.

-

Wide choice of switching programs: 1:1:1, 1:2:2, 1:2:4 , 1:1:2:2, etc. which allows the split up of the total power into up to 31 steps in

MAX

6

or up to 79 steps in MAX

12.

-

Four quadrants control (see fig.2.1) , display of the connected stages, of cos φ

and active and reactive power signs

(inductive or capacitive )

-

LCD display screen with three seven segments characters plus 20 icons to sign up the different possible working conditions.

-

Regulator set-up with only three keys and without disconnecting the device from the supply.

-

Multiple supply frequency range, either 50 or 60 Hz

-

Main electrical parameters displayed during RUN mode

-

Easy panel mounting, without the need of tools.

-

Front frame size (144 x 144 mm) according to DIN 43 700 (panel hole 138

-

Measurement and power supply in one single input.

+1

x 138

+1

mm)

-

Four quadrant regulation (suitable for installations importing or exporting energy)

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Fig. 2.1.- Power signs in four quadrants measurements

3 FRONT PANEL: SCREEN AND KEYBOARD

The PF regulator’s front panel shows the following items:

Front Screen

Configurable Parameters

Measured Parameters

Fig. 3.1.- Front cover and screen

NOTE:

The set-up procedure, the description of different parameters and the different control modes are described in detail in the SET-UP section (section 6)

Navigation keys

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Computer

MAX

devices are equipped with a 3 digits x 7 segments LCD screen. The screen has also a set of icons, which provide information about the regulator status. The main indications are: cosφ value, reactive power sign ( for lagging or inductive PF and for leading or capacitive PF), connected stages and measurement of different parameters (see section 3.2)

Icons Screen and LED

Icons Indications

: Lagging or inductive power indication

: Leading or capacitive power indication

In normal working conditions, RUN

LED (red) is ON and cursor points to the parameter being displayed (Left column list)

The LED (red) is

ON in normal working conditions

The LED shows that the reading of current or

MAX. current has to be multiplied by 10

In SET-UP mode, the RUN LED is

OFF, the cursor is blinking and pointing to the parameter being configured (Right column list).

Symbols indicating the stages which are connected (only in RUN mode)

parameters

When the instrument is in normal RUN mode, the following parameters can be displayed: cos

, mains current, THD of both mains current and mains voltage. The instrument can also display the MAXimum values of mains current and voltage since the last parameters clear. The parameter being displayed can be selected with the navigation keys and is indicated by the cursor.

3.3 Errors and ERROR messages

In case that the regulator detects a possible error, the front screen shows an error code. The possible error codes are listed and explained in table 3-1.

Table 3-1: Possible errors and messages displayed on the screen

ERROR message

Description

Load current below the threshold current, or current transformer (CT) not connected. The threshold is 0,1 A at the secondary side of CT

Overcompensation. The regulator detects that some stages should be disconnected but all the stages are already disconnected.

Under-compensation. The regulator detects that some stages should be connected and all the stages are already connected.

Overcurrent. The measured current exceeds the rated current by a + 20%.

(Rated current is considered to be the CT primary rated current)

Overvoltage. The measured voltage exceeds the rated voltage by a +15%.

In case that the number of stages configured in a Computer

MAX

6 or

MAX

12, is less than 6 or 12 respectively, the relay number 6 or 12 is automatically configured as alarm relay. The relay remains connected in absence of alarm (positive safety) and disconnects in case that one or more of the errors listed in section 3.2 occur. Notice that the absence of supply voltage will always be detected as an alarm condition. The alarm relay has a delay of 10 s in case of Over-compensation and Under-compensation, but the operation is instantaneous (delay < 1 s) in case of Over-voltage and Over-current.

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3.5 Regulator status and key functions

Computer

MAX

regulators have two possible status.

Normal or RUN Status: This is the normal working status of the regulator. In such status the device measures and displays the cos

 of the loads and automatically regulates the connection and disconnection of capacitors in order to compensate according to programmed target value. The regulation depends on several parameters configured during the starting set-up process.

Set-up or adjustment status: This status allows the configuration of the device. Push the key for a time >1 s to enter the set-up status mode. This will stop the automatic PF regulation, will cause the progressive disconnection of connected stages and once disconnected will allow the set-up of the regulator.

The navigation keys have different functions depending on the regulator status.

3.5.1 Key functions in normal RUN status.

Key to enter set-up mode: After a long push (> 1 s) of this key, the device will enter the set-up mode, and will accept configuration changes.

Manual connection of capacitor stages: If this key is pushed for more than 1s, the regulator starts connecting new steps in a sequential mode, respecting the adjusted connection times, t

on

Manual disconnection of capacitor stages: If this key is pushed for more than 1s, the regulator starts disconnecting steps in a sequential mode, respecting the adjusted disconnection times, t

off

3.5.2 Key functions in SET-UP status.

Long Push (>1 s): This is to initiate or exit the set-up mode. Exiting the set-up mode with a long push (>1 s) will automatically save the changed parameters. Exiting with a short push will not save the changes.

Long Push (<1 s): This is used to initiate or exit the different set-up sub-menu options

(different configurable parameters). Warning! The new programmed values are not saved unless a long push of this key (>1 s) is used to exit the set-up menu.

Start Plug&Play process

Upwards navigation in the menu options available in the set-up menu.

Increment of numerical values inside the set-up sub-menus.

Downwards navigation in the menu options available in the set-up menu.

Decrement of numerical values inside the set-up sub-menus.

Change the digit to be edited in case of numerical values with more than one digit.

Alarm Enable / Disable: keep pushing these keys at the same time for more than 1s

+ long push

long

to disable or enable Measured current below threshold, Overcompensation and Sub-compensation alarms (paragraph 3.3). When these alarms were disabled, the regulator doesn’t show its error messages.

Stop Plug&Play process.

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4 INSTALLATION AND START UP

This section contains information instructions and warnings that the user must follow by its own security and to ensure safe operation of the device.

WARNING! Computer MAX

regulators are usually connected to equipment containing capacitors, which remain charged after removing supply voltage. To avoid risk of electric shock, you must wait at least 5 minutes between the disconnection of the equipment and handling of the internal components thereof.

Any handling or use of equipment in different way or conditions to that specified by the manufacturer, may compromise the user safety.

In case that some damage or deterioration signs are detected in the device or a wrong operation is observed, disconnect the supply voltage and contact CIRCUTOR authorized technical service.

To safely use the

Computer

MAX

6 and Computer

MAX

12 it is important that people installing it or handling it follow the usual safety precautions stated in the LV or MV Electrical Code Rules of each

Country as well as the different warnings stated in this instruction manual.

4.1 Technical Characteristics

The main technical characteristics of every particular computer

MAX

6 and computer

MAX

12 device are printed in the rear label (see fig. 1.2) and are also summarized in the following table.

Supply and measuring circuit voltage (Terminals C-D)

Supply Cables

Supply circuit protection

Current measurement circuit.

(Terminals A-B)

Cables for the current measurement circuit (CT secondary side)

Current margin

Measurements precision cos

 setting margin

Power Consumption

(depending on model)

Screen

Output: Relay contacts

Cabling and protection of relays output.

Alarm relay

Reference standards

Safety and Insulation class

Protection degree

Environment admissible conditions

Control system

480, 400, 230 or 110 V ac

; +15% -10% (depending on model);

45…65 Hz. Connect preferably to phases L2-L3.

Cross Section 1,5 mm

2

By means of a 0,5 to 2 A fuse (gl type)

External Current Transformer (CT). Current ratio I n preferably in phase L1.

/5. To be placed

Minimum cross section : 2,5 mm

2

. If cable length between regulator and CT must exceed 25 m, increase the cross section by 1mm

2

every

10 m or use a CT with a higher primary rated current.

0,05 to 5 A (MAXimum overload +20%)

Voltage and Current: 1%; cos

 : 2%  1 digit

0,85 ind. A 0,85 cap. Default setting: 1

110 V: 7 VA (no load); 8,8 VA (6 relays); 10 VA (12 relays)

230 V: 7,4 VA (no load); 8,2 VA (6 relays); 9,9 VA (12 relays)

400 V: 5 VA (no load); 6,6 VA (6 relays); 8,8 VA (12 relays)

480 V: 8,7 VA (no load); 9,5 VA (6 relays); 10,7 VA (12 relays)

1 line x 3 digits x 7segments + 20 icons

Working voltage: 250 V ac

, Admissible current: 4 A, AC1.

Minimum cables cross section: 1,5 mm

2

, Protect by means of a circuit breaker 6 A, curve C or fuse 6 A, gl type

In case that not all the relay outputs are used to drive the capacitors, the highest number relay is by default configured as alarm relay.

EN 61010, EN 61000-3-2, EN 61000-3-3, EN 50081-2, EN 50082-1, EN

50082-2, EN 61000-4-2, EN 61000-4-4, EN 61000-4-8,

EN 61000-4-5, EN 61000-4-11 , UL 94

Installation Category III. Protection against electrical shock with double insulation (class II ), according to EN 61010-1

IP 40 (device mounted in panel front)

IP 30 (device case) according to EN-60529

Temperature: -20 … +60 ºC; Relative humidity: MAX. 95% (without condensation). MAX. altitude: 2000 m

FCP (Program which minimizes the number of operations)

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4.2.1 Mechanical Installation

Mechanically, the device is intended to be mounted attached to the front door of the cabinet. The fitting hole must be according to DIN 43 700, (dimensions 138

+1 x138

+1 mm).

4.2.2 Connections

Before connecting the supply to the device check the following items:

The installation and maintenance of the device must be carried out by specialised and dully trained staff, according to National Electric Codes and Rules and International Standards

All the connections must be at the inner part of a protection cabinet.

Notice that when the device is connected to supply, the voltage at certain terminals can be

hazardous and cause electric shock in case of contact. Opening the electrical cabinet or removing certain covers can compromise the user safety and should only be done by qualified and authorized staff.

The Computer MAX devices are used together with capacitor banks, which can remain charged after supply disconnection. In order to avoid shock hazard, wait during 5 minutes after supply disconnection before any manipulation inside the equipment cabinet.

Computer

MAX

devices require current sensing of the installation. A current transformer (CT) must be installed externally to perform this function. Usually the current ratio of the CT is I

n

be at least 1,5 times the MAXimum expected load current.

/ 5 A, where In must

The CT must be installed at the incoming supply line (point of coupling of the user), so that it measures the total current of all the loads, including also the compensation capacitor bank (see fig. 4.1)

The CT should be installed preferably in phase L1, while the voltage measuring terminals of Computer

MAX

should be connected to phases L2 and L3 (see schematics in figs. 4.2 and 4.3). It’s important to respect the connection senses of P1-P2 and S1-S2 shown in the above mentioned figs, otherwise the phase difference will have to be corrected by adjusting the device according to set-up procedure indicated in paragraph 5.17.

RIGHT CONNECTION WRONG CONNECTIONS

TC

P1

P2

S1

S2

LOAD CAPACITORS

The CT measures the whole current of loads + capacitor bank.

In case of malfunction check that

If CT is placed in this position,

STAGES WILL CONNECT.

If CT is placed in this position

ALL THE CAPACITOR STAGES

WILL CONNECT. the CT is not shortcircuited

The equipment does not regulate properly.

WARNING! This situation may cause overcompensation, resonance and overcurrent

Fig. 4.1.- Placement of current transformer (CT)

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4.2.3 Cabling cross sections and protections

The supply circuit must be protected by means of fuses or a circuit breaker sized between 0,5 and 2 A.

Recommended fuses are gl type (IEC 269) or M type (IEC 127). A main circuit breaker must be provided in order to allow the disconnection of control circuits from supply (Computer, relays, contactor coils, etc.)

The main switch must be easily accessible. The cabling cross section must be minimum 1,5 mm

2 voltage supply and for the relay outputs and 2,5 mm

2

for the

for the cables connecting secondary of CT to

Computer

MAX

. For distances between CT and computer higher than 10m the cross section of the last must be increased at a rate of 1 extra mm

2

every 10 m.

4.2.4 Schematics

computer

MAX

6

S1

P1

A B

S2

P2

COM 1 2 3 4 5 6

RELAYS C1..C6

SUPPLY AND MEASURE

TERMINALS

C D

0

Fig. 4.2.- Connection schematic for Computer

MAX

6

V

1

2

3

4

Nº

A

Terminals functions

Current input S1

B Current input S2 common

Relay Output 1

Relay Output 2

Relay Output 3

Relay Output 4

5

6

Relay Output 5

Relay Output 6

C Supply/Measure Input 0V

D Supply/Measure Input(*)

(*) Rated voltage depending on type. See device label

computer

MAX

12

SUPPLY AND MEASURE

TERMINALS

A B COM 1 2 3 4 5 6 C D

S1

P1

S2

P2

RELAYS C1..C6

RELAYS C7..C12

0 V

6

7

8

9

10

2

3

4

5

Nº

A

B

Terminals description

Current input S1

Current input S2

COM Relays

1 Relay Output 1

11

12

C

D

Relay Output 2

Relay Output 3

Relay Output 4

Relay Output 5

Relay Output 6

Relay Output 7

Relay Output 8

Relay Output 9

Relay Output 10

Relay Output 11

Relay Output 12

Supply/Measure Input 0V

Supply/Measure Input(*)

COM 7 8 9 10 11 12

Fig. 4.3.- Connection schematic for Computer

MAX

12

(*) Rated voltage depending on type. See device label

WARNING!

For Computer

MAX

12 devices (12 relay outputs) the connection between COM terminals in the upper and lower terminal strips must be done externally.

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PARAMETERS

In order to adapt the regulator to the loads, certain parameters of the Computer MAX must be set-up.

The programmable parameters, the required settings and the set-up procedure are explained here below.

See also paragraph 3.5.2 to see how to select the different menu options.

The configurable parameters are listed and shortly explained below.

To access the Plug&Play screen, press the buttons to open the following screen:

Press to start the process; if you want to stop the process, long press and it will return to its initial state.

Once started, the digits will start flashing and the unit will start a capacitor measurement, calculation and connection and disconnection process to gather the following capacitor bank parameters: Phase (5.8) and C/K factor (5.3).

Once the unit's Plug&Play process has finished and no error has occurred during the process, the calculated C/K factor and the measured cosine phi will be displayed on the screen, the result of having correctly configured the phase relationships (2 times each).

If an error occurs during the process, the following screen will appear:

Conditions for the correct operation of the Plug&Play function:

- The system should be maintained with an inductive cosine of 0.62 to 0.99 throughout the process.

- The power in the system should be stable. Any major load changes (>10 % in less than 20 seconds) would result in an incorrect calculation of the capacitor power ratings.

- There must be enough current in the system at the regulator's input, i.e., >100 mA AC.

- If the load is unbalanced, the correct operation of the Plug&Play function will depend on the phase to which the current transformer is connected.

- The correct values for Program (5.5) and Number of steps (5.7) must be configured beforehand.

To set-up this parameter, use the keys until the cursor points to the option , then push

The parameter allows the setting of the desired PF in the installation. The regulator will control the connection of the necessary number of capacitors to get the MAXimum approach to the target value.

Since the regulation is in a stepwise mode, the regulator will add a new step when the demanded power is at least 70% of the lower available step power and will remove a step when the excess is also a 70% of the lower available step power. The cosφ adjustment range is from 0,85 inductive to 0,95 capacitive.

5.3 Smaller available capacitor step

To set-up this parameter, use the keys until the cursor points to the option , then push

This parameter, named C/K, indicates the reactive current supplied by the smaller capacitor step, measured at the secondary side of the current transformer (CT). Therefore, the setting value depends on the power of the smaller capacitor step, on the CT ratio and on the supply voltage. Table 5.1 gives the setting values of C/K for a 400 V phase to phase supply for different CT ratios and different values of smaller capacitor step (kvar). For conditions other than those given in table 5.1, the paragraph 5.13 shows a simple calculation to obtain the C/K value. See also foot NOTE

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Table 5-1.- C/K factor according to smaller capacitor power and CT ratio.

CT ratio

(I p

/I s

)

150/5

200/5

250/5

300/5

400/5

500/5

600/5

800/5

1000/5

1500/5

2000/5

2500/5

3000/5

4000/5

Smaller capacitor power in kvar, at 400 V (*)

2.5 5,00 7.5 10,0 12,5 15,0 20,0 25,0 30,0 37,5 40,0 50,0 60,0 75,0 80,0

0,12 0,24 0,36 0,48 0,60 0,72 0,96

0,09 0,18 0,27 0,36 0,45 0,54 0,72 0,90

0,07 0,14 0,22 0,29 0,36 0,43 0,58 0,72 0,87

0,06 0,12 0,18 0,24 0,30 0,36 0,48 0,60 0,72 0,90 0,96

0,05 0,09 0,14 0,18 0,23 0,27 0,36 0,45 0,54 0,68 0,72 0,90

0,07 0,11 0,14 0,18 0,22 0,29 0,36 0,43 0,54 0,58 0,72 0,87

0,06 0,09

0,07

0,12

0,09

0,15

0,11

0,18

0,14

0,24

0,18

0,30

0,23

0,36

0,27

0,45

0,34

0,48 0,60 0,72 0,90

0,36 0,45 0,54 0,68

0,96

0,72

0,05 0,07 0,09 0,11 0,14 0,18 0,22 0,27 0,29 0,36 0,43 0,54 0,58

0,05 0,06 0,07

0,05

0,10

0,07

0,06

0,05

0,12

0,09

0,07

0,06

0,14

0,11

0,09

0,07

0,05

0,18

0,14

0,11

0,09

0,07

0,19 0,24 0,29 0,36

0,14 0,18 0,22 0,27

0,12 0,14 0,17 0,22

0,10 0,12 0,14 0,18

0,07 0,09 0,11 0,14

0,38

0,29

0,23

0,19

0,14

(*) NOTE: For supply voltages other than 400 V the C/K factor obtained from the table must be multiplied by the ratio (400 / V supply

)

IMPORTANT! :

If C/K is adjusted too low the system will connect and disconnect steps with a lower threshold and therefore the number of operations to control the average PF will be higher.

If C/K is adjusted slightly above the required value (10%) the system will react with higher threshold values and therefore the number of operations to control the average PF will be lower. Wear of PF compensation is also lower.

5.4 C/K parameter calculation

For conditions other than those given in table 5.1 the parameter C/K can be calculated as follows.

The necessary data to perform the calculation are: The power of the smaller capacitor step, Q, the supply voltage, V and the current transformer ratio, K

;

K



I prim

/ I sec

.

Where:

I

is the CT primary rated current (i.e. in a 250/5 CT , the primary rated current is 250 A)

prim

I

is the CT secondary rated current , usually 5 A

sec

Then, the smaller step reactive current, I

C

, can be calculated as:

I

C



Q

3

.

V

and the C/K parameter would be

C / K



I

C



Q

K

3

.

K .

V

Example: Assume a PF equipment at 500V where the smaller capacitor is rated to 60kvar and the CT has a ratio 500/5. The calculation would be as follows:

K ratio

K



500 / 5



100

Smaller capacitor current

I

C



60 .

1000

3 .

500



69 , 28

A

C/K parameter

C

/

K



Ic

K



69 , 28

100



0 , 69

5.5 Stage’s Configuration of PF correction equipment (Configuration program)

To set-up this parameter, use the keys until the cursor points to the option , then push

PF correction equipment is constituted by several capacitor stages, which may have different power ratings. Taking as base the power of the smaller capacitor stage, the powers of the rest of stages can be given in terms of multiples of the smaller step. Then we could state the configuration (configuration program) of PF equipment as:

Program 1:1:1… All the stages have the same power in kvar.

Program 1:2:2… The second stage and successive have a power double than the 1st step.

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The available programs of Computer

MAX

regulator are listed in table 5.2. The default factory setting of

Computer

MAX

devices is 1:1:1:1

Table 5-2.- Available configuration programs for Computer

MAX

devices

Screen Indication Stage’s configuration

111 1:1:1:1:1….

122 1:2:2:2:2….

124 1:2:4.4:4….

248 1:2:4:8:8….

112 1:1:2:2:2….

224 1:2:2.4:4….

123 1:2:3.3:3….

234 1:2:3.4:4….

236 1:2:3.6:6….

246 1:2:4.6:6….

5.6 Connection and re-connection time settings:

To set-up this parameter, use the keys until the cursor points to the option , then push

This parameter sets up the delay times of the device. The setting value, Tc, is the delay time between the connection or disconnection of successive capacitor stages. The parameter also sets up the called reconnection delay, Tr, which is the minimum time that must elapse between the disconnection of a C stage and its following connection. The range of Tc settings goes from 4 s to 999 s. Tr is automatically set to 5 times Tc (Notice that Tr is needed to guarantee the capacitors discharge). The default setting of Tc is

10 s.

5.7 Selection of the number of stages.

To set-up this parameter, use the keys until the cursor points to the option , then push

This setting allows the selection of the number of stages of the PF compensation equipment. Depending on the device type, Computer

MAX

6 or

MAX

12 we can select up to 6 or 12 stages. If the number of stages is less than 6 or 12 respectively in Computer

MAX

6 or

MAX

12 the relay number 6 or 12 is automatically assigned as alarm relay (see paragraph 3.3)

5.8 U,I phase angle setting.

To set-up this parameter, use the keys until the cursor points to the option , then push

During the set-up of this parameter, the screen shows alternatively one of the options T1 to T6 and the cos

.

This parameter permits the adaptation of the regulator to different options of connection of voltage and current measurement in the three phase system. The default assumed connection is the one shown in figs. 4.2 and 4.3, i.e., the current transformer placed in phase L1 and voltage measurement between phases L2 (terminal C) and L3 (terminal D). Sometimes it’s difficult to guarantee this connection or even check how it is. To adapt to this unknown situations the Computer MAX devices allow the selection of different options, T1 to T6, as shown in table 5.3. To select the right option during start up, you should verify that there is load and that the loads are mainly inductive with a cos

 between 0,7 y 1. In this situation try the different options until the cos

 screen shows a value between 0,7 and 1.

Table 5-3.- Phase shift options in Computer

MAX

Screen

U-I phase shift at cos

=1

V measured in phases

T1 30º

T2 270º

T3 150º

L3-L2

L3-L2

L3-L2

T4

T5

T6

210º

90º

330º

L3-L2

L3-L2

L3-L2

CT placed in phase

L3

L1

L2

L3 (P1-P2 or S1-S2 reversed)

L1 (P1-P2 or S1-S2 reversed)

L2 (P1-P2 or S1-S2 reversed)

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5.9 Programming the CT rated current (primary).

The set-up of this parameter can be selected at the bottom of the menu options. Use the keys until the bottom red LED is flashing and push . The display will show the assumed CT primary current. Set the value according to the CT used to measure installation current. The adjustment range is from 0 to 999 and with the x10 option allows a rated primary current up to 9990 A. By default the secondary of CT is assumed to be 5 A.

6 SET-UP MENU AND PROCEDURE.

6.1 How to access the set-up menu.

To access the set-up menu, press the key for more than 1s (This is designated as long push in table

6.1 , which gives a summary of the set-up procedure). The pointer starts blinking and points to the parameter to be adjusted. Select the parameter by means of the keys

After the long push and in case that all the capacitor stages are disconnected, the device jumps to the set-up status. In case that there are some stages connected, keep the key pushed while the regulator disconnects the connected stages sequentially and respecting the programmed delay time. Once all the stages have been disconnected the device enters the set-up status and allows the adjustment of the different parameters. A schematic diagram of the set-up menu showing the different navigation paths is shown in table 6.1. The meanings of the different adjustable parameters have been explained in paragraph 5.1.

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6.2 Navigation schematic.

Tabla 6-1.- Menu navigation schematic

Parameter selection

Long push to start set-up

Plug&Play

Target cos



Starting screen

C/K

Program

Delay times

Nr of stages

CT phase

CT primary current

Device screen display See paragraph

5.5

5.6

5.2

5.3

5.4

5.1

5.7

5.8

5.9

 IMPORTANT! :

While the device is in set-up mode, if there isn’t any key pushing for more than 3 minutes, the device returns automatically to normal RUN mode and none of the previously edited parameters are changed nor saved. To exit the set-up menu changing the edited parameters, push the key for more than 1s.

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Once the device has been configured according to installation needs it can be set to RUN mode to regulate the PF of the installation. RUN mode is the default mode after exiting the set-up menu or after the device start (supply connection followed by a short initialisation period). When the device is in RUN mode it can reach one of the following status:

a) Normal RUN status (Absence of alarm): In this status the device performs the automatic PF regulation, connecting and disconnecting the capacitor stages according to installation needs. In this status the user can access to the measurement of different parameters and can also force the manual connection or disconnection of capacitor stages as described in paragraph 7.1.

b) Alarm status: If any of the anomalous situations described in paragraph 3.2 occur, the device jumps to alarm status and displays the error code. Depending on the error type the regulator may perform the disconnection of all the stages or continue regulating the PF as in normal RUN.

7.1 Functions of the device in normal RUN mode.

In the normal RUN mode the Computer

MAX

can perform the following functions:

long

Manual connection of capacitor stages. Keep the key pushed during more than 1s and the regulator will sequentially connect the different steps, following the normal program and respecting the delay time t

on

set in the set-up procedure

long

short

Manual disconnection of capacitor stages: Keep the key pushed during more than

1s and the regulator will sequentially disconnect the different steps, following the normal program and respecting the delay time t

off

set in the set-up procedure.

Displaying the number of connected steps: If both keys are simultaneously pushed the device displays the Nr of connected steps. (Remember the difference between step and stage described in paragraph 1.1)

Parameters measurement: Performing successive short pushing of this key (<1 s), the user can travel along several display screens showing the values of the following parameters: (cos) , cosinus

 of the installation ; (I) , mains current; (THD), THD of mains current; (V) , Mains voltage; (I, MAX), MAXimum value of mains current since the last clear; (V MAX), MAXimum value of mains voltage since the last clear. The displayed parameter is pointed by the cursor

short

Parameters measurement: Performing successive short pushing of this key (<1 s), the user can travel through the readings of the same parameters described above but in reverse order.

Start the SET-UP mode: : Performing a long push of this key (<1 s), the device jumps to set-up mode.

long

MAX

Clear MAX values: Performing a long push of this key (<1 s) while the cursor is pointing to MAX , the Computer MAX clears the MAXimum values of voltage and current recorded since the last clear.

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7.2 Computer MAX behaviour in ALARM mode

In case that the Computer

MAX

detects an error during normal operation (see paragraph 3.2) the screen displays an error code and the behaviour of the device is as described in table 7-.1.

Table 7-1: Computer

MAX

behaviour under ALARM conditions

ERROR message

Description

Possible cause and Computer

MAX

behaviour

Measured current below

threshold (0,05A measured

Posible causes: Baja carga o TC no conectado.

El aparato muestra el LED de RUN y la pantalla con todo at the secondary side of CT) ceros parpadeando y no conecta ningún relé

Over-compensation. The controller demands for stages disconnection and they are all disconnected.

Sub-compensation. The controller demands for stages connection and they

Possible causes: C/K not properly adjusted

None of the realys will connect.

Possible causes: C/K not properly adjusted

All the relays will remain connected, except the alarm relay if exists (see paragraph 3.3) are all connected.

Overcurent. The measured current is 20% above the rated current (primary of CT)

Possible causes: C/K not properly adjusted

Alarm relay, if exists, disconnects (see paragraph 3.3)

Although the regulation may be wrong, the device tries to regulate the PF normally.

Overvoltage. The measured voltage is 15%

Possible causes: Connection to a wrong supply voltage.

Alarm relay, if exists, disconnects (see paragraph 3.3) above rated voltage. Although the regulation may be wrong, the device tries to regulate the PF normally.

8 MAINTENANCE

The Computer

MAX

6 and

MAX

12 do not require a special maintenance program. In case that some adjustments or maintenance might be necessary it must be performed by dully qualified staff and respecting the required safety procedures.

If any malfunction of the PF compensation equipment or associated protections is detected, the equipment should be disconnected from mains. Before performing any maintenance repair or update operation on the Computer or associated PF compensation equipment, be sure to disconnect the main switch and after disconnecting the switch, wait at least 5 minutes to ensure that the capacitors are totally discharged.

In case of any doubt on the behaviour of the device or in case of malfunction which cannot be solved by the maintenance staff, contact CIRCUTOR technical service:

CIRCUTOR, SA. - Servicio Posventa.

Vial Sant Jordi, s/n

08232 – Viladecavalls (Barcelona)

Tel. - 902 449 459 (Spain)

Tel. - (+34) 93 745 29 00 (Out of Spain)

Fax. - (+34) 93 745 29 14 e-mail - [email protected]

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