Iskra PFC max 6 User manual

User's manual
POWER FACTOR REGULATORS
PFC max 6 / PFC max 12

User's manual
PFC max 6, PFC max 12 Page 2
Index
1. INTRODUCTION AND SAFETY RECOMMENDATIONS ............................................................... 4
1.1 Delivery spot check............................................................................................................... 5
1.2 Starting screen...................................................................................................................... 5
1.3 Definitions............................................................................................................................. 5
1.3.1 Four quadrant regulators ............................................................................................. 6
1.3.2 FCP program (FAST PFCized Program) ..................................................................... 6
1.3.3 Stages and steps......................................................................................................... 6
1.3.4 Stages ratio program................................................................................................... 6
2. GENERAL CHARACTERISTICS ................................................................................................... 7
3. FRONT PANEL: SCREEN and KEYBOARD ................................................................................. 8
3.1 Display screen ...................................................................................................................... 9
3.2 Measured parameters ........................................................................................................... 9
3.3 Errors and ERROR messages .............................................................................................. 9
3.4 Alarm relay.......................................................................................................................... 10
3.5 Regulator status and key functions ..................................................................................... 10
PFC max regulators have two possible status. .................................................................................. 10
3.5.1 Key functions in normal RUN status .......................................................................... 11
3.5.2 Key functions in SET-UP status................................................................................. 11
4. INSTALLATION AND START UP ................................................................................................ 12
4.1 Technical Characteristics .................................................................................................... 12
4.2 DEVICE INSTALLATION .................................................................................................... 13
4.2.1 Mechanical Installation .............................................................................................. 13
4.2.2 Connections .............................................................................................................. 13
4.2.3 Cabling cross sections and protections...................................................................... 14

User's manual
PFC max 6, PFC max 12 Page 3
4.2.4 Schematics ............................................................................................................... 15
5. CONFIGURABLE PARAMETERS ............................................................................................... 16
5.1 Target cosφ ........................................................................................................................ 16
5.2 Smaller available capacitor step.......................................................................................... 16
5.3 C/K parameter calculation................................................................................................... 17
5.4 Stage’s Configuration of PF correction equipment (Configuration program) ........................ 17
5.5 Connection and re-connection time settings:....................................................................... 18
5.6 Selection of the number of stages....................................................................................... 18
5.7 V,I phase angle setting........................................................................................................ 18
5.8 Programming the CT rated current (primary)...................................................................... 19
6. SET-UP MENU AND PROCEDURE............................................................................................. 19
6.1 How to access the set-up menu .......................................................................................... 19
6.2 Navigation schematic.......................................................................................................... 20
7. RUN STATUS .............................................................................................................................. 21
7.1 Functions of the device in normal RUN mode ..................................................................... 21
7.2 PFC max behaviour in ALARM mode................................................................................. 22
8. MAINTENANCE ........................................................................................................................... 22

User's manual
PFC max 6, PFC max 12 Page 4
INTRODUCTION AND SAFETY RECOMMENDATIONS
Iskra would like to thank you for showing your trust by choosing one of our PFC 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 PFC max series regulators and shows the user the
procedures required to install, commission and operate the units.
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 PFC 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 PFC 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.

User's manual
PFC max 6, PFC max 12 Page 5
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 Iskra, technical
service.
Fig. 0.1.- Rear face label
1.2 Starting screen
When the PFC 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.
Terminals available only for
PFC
max
12
:
12 relays
Number of outputs indication
depending on type
PFC
max
6
6 relays
PFC
max
12
12 relays
Supply and measuring voltage
Frequency: either 50 or 60 Hz
Output relays characteristics

User's manual
PFC max 6, PFC max 12 Page 6
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 PFCized 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.
1.3.3 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 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.
1.3.4 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 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.

User's manual
PFC max 6, PFC max 12 Page 7
2. GENERAL CHARACTERISTICS
The power factor regulators, of types PFC max6 and
max 12 measure the cosφ (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.
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 cosφ 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 60Hz
- 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+1 x 138+1 mm)
- Measurement and power supply in one single input.
- Four quadrant regulation (suitable for installations importing or exporting energy)
0º
90º
180º
-90º
Imported Power
Exported Power
KW +
kVAr +
Leading/Capacitive
KW -
kVAr -
KW +
kVAr -
Lagging / Inductive
KW -
kVAr +
Cos -
Lagging / Inductive
Cos -
Cos +
Cos +
Leading/Capacitive
Fig. 2.1.- Power signs in four quadrants measurements

User's manual
PFC max 6, PFC max 12 Page 8
3. FRONT PANEL: SCREEN and KEYBOARD
The PF regulator’s front panel shows the following items:
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)
Front Screen
Configurable Parameters
Measured Parameters
Navigation keys

User's manual
PFC max 6, PFC max 12 Page 9
3.1 Display screen
PFC 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
The RUN LED (red) is ON in
normal working conditions
The x10 Ip LED shows
that the reading of current or
max. current has to be
multiplied by 10
In normal working
conditions, RUN LED (red)
is ON and cursor points
to the parameter being
displayed (Left column list)
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)
3.2 Measured 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 0,1A at
the secondary side of CT
Overcompensation. The regulator detects that some
stages should be disconnected but all the stages are
already disconnected.

User's manual
PFC max 6, PFC max 12 Page 10
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%.
3.4 Alarm relay
In case that the number of stages configured in a PFC max 6or 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 10s in case of Over-compensation and Under-compensation, but the operation
is instantaneous (delay < 1s) in case of Over-voltage and Over-current.
3.5 Regulator status and key functions
PFC 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 >1s 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.

User's manual
PFC max 6, PFC max 12 Page 11
3.5.1 Key functions in normal RUN status
Key to enter set-up mode: After a long push (> 1s) 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, ton
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, toff
3.5.2 Key functions in SET-UP status
Long Push (>1s): This is to initiate or exit the set-up mode. Exiting the set-up mode
with a long push (>1s) will automatically save the changed parameters. Exiting with a
short push will not save the changes.
Long Push (<1s): 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 (>1s) is used to exit the set-up menu.
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.

User's manual
PFC max 6, PFC max 12 Page 12
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! PFC 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 Iskra authorized technical service.
To safely use the PFC max 6and PFC 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 PFC max 6and PFC 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)
480, 400, 230 o 110 VCA ; +15% -10% ; 45-65 Hz , (see label)
Connect preferably to phases L2-L3.
Supply Cables
Cross Section 1,5mm2
Supply circuit protection
By means of a 0,5 to 2 A fuse (gl type)
Current measurement circuit.
(Terminals A-B)
External Current Transformer (CT). Current ratio In /5. To be
placed preferably in phase L1.
Cables for the current
measurement circuit
(CT secondary side)
Minimum cross section : 2,5mm2. If cable length between
regulator and CT must exceed 25m, increase the cross section
by 1mm2every 10m or use a CT with a higher primary rated
current.
Current margin
0,1 to 5 A (maximum overload +20%)
Measurements precision
Voltage and Current: 1%; cos : 2% 1 digit
cos setting margin
0,85 ind. A 0,85 cap. Default setting: 1
Power Consumption
6 VA (all relays OFF) ; 9,5VA (12 relays ON)
Screen
1 line x 3 digits x 7segments + 20 icons
Output: Relay contacts
Working voltage: 250 VCA, Admissible current: 10 A, AC1.
Cabling and protection of relays
output.
Minimum cables cross section: 1,5mm2, Protect by means of a
circuit breaker 6A, curve C or fuse 6A, gl type
Alarm relay
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.
Reference standards
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
Safety and Insulation class
Installation Category III. Protection against electrical shock
with double insulation (class II ), according to EN 61010-1

User's manual
PFC max 6, PFC max 12 Page 13
Protection degree
IP51 (device mounted in panel front)
IP30 (device case) according to EN-60529
Environment admissible conditions
Temperature: -20ºC a +60ºC; Relative humidity: max. 95%
(without condensation). Max. altitude: 2000m
Control system
FCP (Program which minimizes the number of operations)
4.2 DEVICE INSTALLATION
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+1x138+1mm).
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 PFC 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.
PFC 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 In / 5 A, where In must be at
least 1,5 times the maximum expected load current.
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 PFC 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 5.1.7.

User's manual
PFC max 6, PFC max 12 Page 14
RIGHT CONNECTION
WRONG CONNECTIONS
The CT measures the whole
current of loads + capacitor
bank.
In case of malfunction check
that the CT is not
shortcircuited
If CT is placed in this position,
NONE of the CAPACITOR
STAGES WILL CONNECT.
The equipment does not regulate
properly.
If CT is placed in this position
ALL THE CAPACITOR STAGES
WILL CONNECT.
WARNING! This situation may
cause overcompensation,
resonance and overcurrent
Fig. 4.1.- Placement of current transformer (CT)
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 2A.
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 (PFC, relays, contactor coils, etc.)
The main switch must be easily accessible. The cabling cross section must be minimum 1,5 mm2for the
voltage supply and for the relay outputs and 2,5 mm2for the cables connecting secondary of CT to
PFC max . For distances between CT and PFC higher than 10m the cross section of the last must be
increased at a rate of 1 extra mm2every 10 m.
TC
S1
S2
P1
P2
LOAD CAPACITORS
TC
S1
S2
P1
P2
LOAD CAPACITORS
LOAD CAPACITORS
TC
S1
S2
P1
P2

User's manual
PFC max 6, PFC max 12 Page 15
4.2.4 Schematics
PFC max 6
Fig. 4.2.- Connection schematic for PFC max 6
Nº
Terminals functions
A
Current input S1
B
Current input S2
COM
Relays common
1
Relay Output 1
2
Relay Output 2
3
Relay Output 3
4
Relay Output 4
5
Relay Output 5
6
Relay Output 6
C
Supply/Measure Input 0V
D
Supply/Measure Input(*)
(*) Rated voltage depending on type. See device label
PFC max 12
Fig. 4.3.- Connection schematic for PFC max12
Nº
Terminals description
A
Current input S1
B
Current input S2
COM
Relays common
1
Relay Output 1
2
Relay Output 2
3
Relay Output 3
4
Relay Output 4
5
Relay Output 5
6
Relay Output 6
7
Relay Output 7
8
Relay Output 8
9
Relay Output 9
10
Relay Output 10
11
Relay Output 11
12
Relay Output 12
C
Supply/Measure Input 0V
D
Supply/Measure Input(*)
(*) Rated voltage depending on type. See device label
WARNING! For PFC max12 devices (12 relay outputs) the connection between COM terminals in
the upper and lower terminal strips must be done externally.
COM
0
1 2 3 4 5 6A B
S1 S2
C D
RELAYS C1..C6
SUPPLY AND MEASURE
TERMINALS
V
P1 P2
COM 7 8 9 10 11 12
COM
0
1 2 3 4 5 6A B
S1 S2
C D
RELAYS C1..C6
RELAYS C7..C12
SUPPLY AND MEASURE
TERMINALS
V
P1 P2

User's manual
PFC max 6, PFC max 12 Page 16
5. CONFIGURABLE PARAMETERS
In order to adapt the regulator to the loads, certain parameters of the PFC 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.
5.1 Target cosφ
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.
5.2 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 5.1.3
shows a simple calculation to obtain the C/K value. See also foot NOTE.
Table 5-1.- C/K factor according to smaller capacitor power and CT ratio.
CT
ratio
(Ip/Is)
Smaller capacitor power in kvar, at 400V (*)
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
150/5
0,12
0,24
0,36
0,48
0,60
0,72
0,96
200/5
0,09
0,18
0,27
0,36
0,45
0,54
0,72
0,90
250/5
0,07
0,14
0,22
0,29
0,36
0,43
0,58
0,72
0,87
300/5
0,06
0,12
0,18
0,24
0,30
0,36
0,48
0,60
0,72
0,90
0,96
400/5
0,05
0,09
0,14
0,18
0,23
0,24
0,36
0,48
0,58
0,67
0,72
0,87
500/5
0,07
0,11
0,14
0,18
0,22
0,29
0,36
0,45
0,54
0,54
0,72
0,87
600/5
0,06
0,09
0,12
0,15
0,18
0,24
0,30
0,36
0,45
0,48
0,60
0,72
0,90
0,96
800/5
0,07
0,09
0,11
0,14
0,18
0,23
0,27
0,33
0,36
0,45
0,54
0,68
0,72
1000/5
0,05
0,07
0,09
0,11
0,14
0,18
0,22
0,27
0,29
0,36
0,43
0,54
0,57
1500/5
0,05
0,06
0,07
0,10
0,12
0,14
0,18
0,19
0,24
0,29
0,36
0,38
2000/5
0,05
0,07
0,09
0,11
0,13
0,14
0,18
0,22
0,27
0,28
2500/5
0,06
0,07
0,09
0,10
0,12
0,14
0,17
0,22
0,23
3000/5
0,05
0,06
0,07
0,09
0,10
0,12
0,14
0,18
0,19
4000/5
0,05
0,06
0,07
0,09
0,11
0,14
0,14
(*) NOTE: For supply voltages other than 400V the C/K factor obtained from the table must be multiplied by the ratio (400 / Vsupply)

User's manual
PFC max 6, PFC max 12 Page 17
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.
5.3 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, Vand the current transformer ratio, K;
sec
/IIK prim
.
Where:
prim
I
is the CT primary rated current (i.e. in a 250/5 CT , the primary rated current is 250 A)
sec
I
is the CT secondary rated current , usually 5 A
Then, the smaller step reactive current, IC, can be calculated as:
V
Q
C
I.3
and the C/K parameter would be
VK
Q
K
I
KC C
..3
/
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:
Kratio
1005/500K
Smaller capacitor current
AIC28,69
500.3
1000.60
C/K parameter
69,0
100
28,69
/K
Ic
KC
5.4 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.
The available programs of PFC max regulator are listed in table 5.2. The default factory setting of PFC
max devices is 1:1:1:1

User's manual
PFC max 6, PFC max 12 Page 18
Table 5-2.- Available configuration programs for PFC 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….
5.5 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 re-
connection 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 4s to999s. Tr is automatically set to 5
times Tc (Notice that Tr is needed to guarantee the capacitors discharge). The default setting of Tc is
10s.
5.6 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, PFC max 6 ó max 12 we can select up to 6 or 12 stages. If the number of stages is less
than 6 or 12 respectively in PFC max6 or max12 the relay number 6 or 12 is automatically assigned as
alarm relay (see paragraph 3.3)
5.7 V,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 PFC 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.

User's manual
PFC max 6, PFC max 12 Page 19
Table 5-3.- Phase shift options in PFC max
Screen
V-I phase shift at
cos =1
V measured in phases
CT placed in phase
T1
30º
L3-L2
L3
T2
270º
L3-L2
L1
T3
150º
L3-L2
L2
T4
210º
L3-L2
L3 (P1-P2 or S1-S2 reversed)
T5
90º
L3-L2
L1 (P1-P2 or S1-S2 reversed)
T6
330º
L3-L2
L2 (P1-P2 or S1-S2 reversed)
5.8 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.
F

User's manual
PFC max 6, PFC max 12 Page 20
6.2 Navigation schematic
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.