Page 1
Varlogic NR6, NR12
Power factor controller
User manual
Page 2
Table of Contents
1. General...................................................................................................3
1.1 Safety...............................................................................................3
1.2 Description.......................................................................................3
2. Installation ..............................................................................................5
3. Display....................................................................................................6
4. Start-up Procedure.................................................................................6
5. Menu Operations....................................................................................7
5.1 General.............................................................................................7
5.2 Main Menu .......................................................................................9
5.3 Bank Pre-Configuration .................................................................11
5.4 Commissioning ..............................................................................13
5.5 Auto Setup of Parameters .............................................................14
5.6 Manual Setup of Parameters .........................................................15
5.7 Measurement Menu.......................................................................17
5.8 Parameter Update..........................................................................18
5.9 Alarms Menu..................................................................................19
5.10 Maintenance Menu ......................................................................20
6. Miscellaneous.......................................................................................23
6.1 Stepping Programs........................................................................23
6.2 Manual calculation of response value............................................26
6.3 High Voltage use of NR6/NR12......................................................27
7. Glossary ...............................................................................................29
8. Technical specifications .......................................................................31
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USER´S MANUAL
Power Factor Controller NR6 / NR12
USER’S MANUAL
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USER´S MANUAL
1. General
1.1 Safety
The following precautions must be taken into account when installing and operating the controller
• The installation of the controller must be performed by a qualified electrician
• Do not touch the connectors when the controller is energized, make sure that
the operating voltage is disconnected before touching any parts located on the
rear side of the controller
• Do not open a live current circuit, this may cause dangerous overvoltages. Always
short circuit the current transformer (CT) before replacing or removing the controller
installed in a bank.
• Do not open the controller casing, there are no user serviceable parts inside
For better understanding of the terminology used, please refer to the Glossary
(chapter 7) at the end of this manual.
1.2 Description
Front view:
Legend
A Display
B Keys
C Opening of door
D Door
E Alarm information
F Mounting bracket for panel mounting installation
Page 4
Rear view:
Legend
Side view:
Legend
See Chapter 8 for technical specifications.
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G Step output connectors
H Specification label
I Mounting bracket for panel mounting installation
J Fixing spring for DIN-rail mounting
K Current/voltage connection inputs
L Fan and alarm outputs
M DIN-rail mounting installation area
N Screwdriver guide
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2. Installation
The controller is designed for either panel (cut-out 138 x 138 mm) or DIN-rail installation. It is
locked to the rail by a screwdriver-operated fixing spring and to a panel by a side fitting spring.
There are two ways of connecting the controller to the network.
Voltage LN (Line – Neutral) (CT on the same line phase)
Voltage LL (Line – Line) (CT on the third phase)
Incorrect connections can be automatically corrected by the controller when Auto Setup is
selected from the main menu.
Caution: For use in HV network, look first at chapter 6.3
Figure 1: Controller connections
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3. Display
The controller is equipped with a backlighted LCD-display.
Figure 2 : Display layout and symbols
4. Start-up Procedure
Before connecting power, check the wiring of all controller terminals. Check carefully for correct
operating voltage. Selection of wrong voltage input can permanently damage the controller.
After the first power switch-on, the controller will automatically ask for the language setting of
the menu.
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Figure 3: Language setting dialog
5. Menu Operations
5.1 General
Navigation between different menu levels
As a precaution against accidental use, the access of certain menus has been protected by a
keylock, which is a special sequence of keystrokes enabling the use the particular menu item.
Page 8
Figure 4: General way of entering the menu with a keylock
Adjusting a value
Figure 5: Adjusting a value
Special case: The wiring editor
Figure 6: The wiring editor
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USER´S MANUAL
Page 9
5.2 Main Menu
The main menu contains all basic submenus required to set up and operate the controller.
Which menu to choose?
Figure 7: Required skills and menu selection
If bank preconfiguration is properly done, commissioning does not require any special skill.
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Figure 8: Main menu
(1) Bank pre-configuration
When factory settings have not been changed, this
menu provides the bank builder the means of preconfiguring the bank at the workshop. After preconfiguration, this menu topic is replaced by
(2) Commissioning, by which the controller is taken
into service.
(3) Automatic setup of parameters
In the event that the controller has not been preconfigured, an inexperienced user can automatically
set up all the characteristics of the bank and bring it
into service.
(4) Manual setup of parameters
In the event that the controller has not been preconfigured, an experienced user can manually set up
all the characteristics of the bank and bring it into
service.
(5) Measurement
The measurement menu contains the most common
measurements taken from the network and provides
some information about the bank. This is a read-only
menu.
(7) Alarm settings
To adjust status and parameters of alarms.
(8) Maintenance
The maintenance menu provides some useful
information about the usage of the bank, capacitors
and contactors. Some auxiliary settings and action
have also been provided. This menu is basically
intended for use by the manufacturer’s maintenance
team.
(6) Parameter update
At any time, an experienced user can access the most
common operating parameters from this menu. Unlike
the configuration and setup sequences, this is a menu
allowing a free and unrestricted entry into all its items
and should be used when an occasional parameter
access is needed.
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5.3 Bank Pre-Configuration
This menu item is a forced sequence, meaning that all items must be accessed before the preconfiguration takes place.
NOTE: Do not use of the Bank Pre-Configuration menu for HV network
applications
The sequence can be interrupted by pressing key.
See Glossary (chapter 7) for parameters definitions.
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Figure 9: Bank pre-configuration
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5.4 Commissioning
A pre-configured controller is put into service by this menu. The sequence contains an automatic
parameter verification to check that the manually entered parameters agree with the network
used.
See Glossary (chapter 7) for parameter definitions.
NOTE: Do not use of the Commissioning menu for HV network applications
What to do in case of error ?
Error codes can help you to identify a problem and make corrections.
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USER´S MANUAL
Figure 10: Commissioning
Page 14
Code Meaning
Unstable network: The controller is unable to
operate due to excessive load variations on the
network. CT oversized.
Step size too small: The effect of the 1
st
step
cannot be measured. CT oversized, wrong
wiring, inoperative steps.
Sequence not found: Step ratio does not match
available step sequences.
Step size too large: The ratio of measured step
compared with the 1
st
step is too large. Step
sequence cannot be resolved.
Non-relevant autosetup process with this bank
configuration
Reserved
Wiring verify error: Controller wiring not correct.
Step count error: The Number of Steps setting
is incorrect.
Step sequence error: The step size ratios differ
from the selected step sequence.
C/K value error.
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5.5 Auto Setup of Parameters
The auto setup sequence is intended for inexperienced users so they can commission the bank
with minimal prior knowledge. The user need only input three of the most common parameters
and then launch an automatic search for the other parameters.
NOTE: The use of Auto Setup of Parameters menu is forbidden on HV network applications
In the event of error, see the Commissioning Menu (chapter 5.4).
Action to do
• Enter the parameter settings
manually using Parameter
Update menu.
• Rerun the commissioning
sequence
• Check wiring, CT, condition of
capacitor steps (1
st
step)
• Check the condition and sizes
of steps and contactors
• Check the condition and sizes
of steps and contactors
• Use manual setup to confirm
or correct the information
obtained by autosetup
• Check the wiring of voltageand current inputs
• Check the Wiring setting from
Parameter Update menu
• Check the Number of Steps
setting
• Check the number of steps in the
bank and the condition of steps
• Check Step Sequence setting
• Check step sizes used in the
bank
• Check the response value used
• Check the size of 1
st
step in the
bank
to
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USER´S MANUAL
Figure 11: Auto setup of parameters
5.6 Manual Setup of Parameters
The manual setup sequence is intended for experienced users. There are nine important
parameters to input before the controller can be taken into service. This sequence is
completed by an automatic verification of the parameters entered earlier in this sequence.
This menu item is a forced sequence, meaning that all items must be accessed before the
validation of the setup takes place.
The sequence can be interrupted by pressing key.
See Glossary (chapter 7), for parameter definitions.
In case of error, refer to the Commissioning Menu, chapter 5.4.
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Figure 12: Manual setup of parameters
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5.7 Measurement Menu
The measurement menu contains the most common measurements taken from the network.
This is a read-only menu sequence.
Figure 13: Measurement menu
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5.8 Parameter Update
The most common operating parameters can be accessed from this menu.
Unlike the configuration and setup sequences presented earlier in this text, this is a menu
allowing a free and unrestricted entry into all of its items and should be used when occasional
parameter access is needed.
See Glossary (chapter 7), for parameter definitions.
In case of error, refer to the Commissioning Menu, chapter 5.4.
Figure 14: Parameter update
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5.9 Alarms Menu
In Alarms menu, each individual alarm can be enabled or disabled.
Once an alarm condition is detected, the corresponding alarm number is shown at the upper
part of the display, and the alarm symbol is on. The alarm relay is also activated.
List of alarms:
Alarm contacts are
• closed when the controller is not energized
• opened when the controller is energized without alarm
• closed when the controller is energized with alarm
ALRM.SET
• informs on the status of each alarm : enabled or disabled
• allows enabling or disabling of each individual alarm by setting it ON or OFF. If an alarm
is set to OFF, it cannot cause an alarm under any condition. To allow a normal alarm
response, the appropriate alarm must be enabled, i.e. set ON.
Some alarm triggering levels can be adjusted
Alarm No 9 (overtemperature ), with temperature limit setting
Alarm No 10 (voltage distortion ), with THD(U) limit setting
An alarm can be reset by an extended pressure of key, this clears all passive alarms.
If alarm condition is still active, the alarm cannot be reset.
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USER´S MANUAL
Alarm
No
.
1
2
3
4
5
6
7
8
9
10
Alarm Possible cause Controller action
Low power factor
Hunting
Abnormal Cos Phi
Low voltage
Overcapacitive
Wrong frequency
Overcurrent
Overvoltage
Overtemperature
Voltage distortion
• Wiring or LL/LN definition error
• Undersized bank
• Too small C/K value
• Wrong program choice
• Defective capacitors
(optimal program)
• Wiring mistake
• overcapacitive network
(welded contactors)
• Too low current
• Wiring or LL/LN definition error
• Improper use of
fixed steps
• Wrong or unstable network
frequency detected at startup
• Undersized CT
• Ambient temperature too high
• Defective coolingsystem
• Harmonic pollution
• Resonance
Pauses regulation for 10
minutes
Disconnection till voltage
returns
Stop regulation. No automatic restart
Temporary disconnection of steps
Temporary disconnection of steps
Temporary disconnection of steps
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Figure 15: Alarms menu
5.10 Maintenance menu
The maintenance menu provides useful information about the usage of the bank, capacitors
and contactors. Also, some auxiliary settings have been provided.
CAUTION: This menu access is dedicated to specialists.
CAUTION: In case of installation in a HV bank (with VT), you must adjust the default
factory settings. The reconnection delay must be changed to a larger
value (e.g. 600 secs) to prevent destruction of capacitors.
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Figure 16/1: Maintenance menu
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Figure 16/2: Maintenance menu
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6. Miscellaneous
6.1 Stepping programs
The controller's algorithm will try to reach the target cos inside a tolerance area dependant
upon the C/K value. It reaches the value by switching on or off available relevant steps.
The regulation step program choice is as follows:
a) Stack Program (linear) :
All capacitor steps are of equal size (ex :1.1.1.1). The operation sequence obeys to a last-in-
first-out (LIFO) principle. The first step connected will be the last one to be disconnected and
vice versa. See Fig. 17
b)
Normal program (2+ linear)
Normal program can be used on bank whose step ratio is 1.2.4.4.. The linear sequence starts
with the 3rd step. The two first steps are used as fine-tuning. The controller always start by
switching the first step then the second. Other steps are used successively See Fig. 18.
c)
Circular A program
All capacitor steps are of equal size (ex :1.1.1.1). The operation sequence obeys the first-in-firstout (FIFO) principle. The first step connected will be the first one to be disconnected and vice
versa. Then a circular sequence is followed. In order to operate correctly, the number of steps
programmed into the controller must strictly comply with the number of physical steps
See Fig. 19.
d) Circular B program (1+Circular)
Circular B program can be used on a bank whose step ratio is 1.2.2.2… The first step is used
as tuning after the activating limit is exceeded. The circular sequence starts with the 2nd step.
Figure 17: Stack program - Operation
sequence 1:1:1:1
Figure 18: Normal program - Operation
sequence 1:2:4:4
Step Step number
demand 1 2 3 4 5 6
+ X
+ X X
+ X X X
+ X X X X
+ X X X X X
+ X X X X X X
- X X X X X
- X X X X
- X X X
- X X
+ X X X
+ X X X X
+ X X X X X
- X X X X
- X X X
- X X
- X
Step Step number
demand 1 2 3 4 5 6
+ X
+ X X
+ X X X
+ X X X X
- X X X
- X X
+ X X X
+ X X X X
+ X X X X X
- X X X X
- X X X
- X X
- X
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e) Optimal Program :
The optimal program operates with many step configurations:
1.1.1.1.1 1.2.2.2.2 1.2.4.4.4 1.2.4.8.8 1.1.2.2.2
1.1.2.3.3 1.1.2.4.4 1.2.3.3.3 1.2.3.4.4 1.2.3.6.6
The target cos
power is reached using the fewest number of steps in minimal time. Like the
circular program, this algorithm equalises the usage of steps.
This program uses optimally selected steps sizes when approaching the target power and at
the same time the response delays are shortened, particularly if there is a large requirement for
kvar or if the network suddenly becomes capacitive.
Comparison between normal and optimal program:
Normal program will reach the cos
target value by successive connection/disconnection of
kvar corresponding to the smallest step value.
Optimal program will reach the target cos
value by successive connection/disconnection of
kvar corresponding to the highest relevant and available step value
Figure 20: Circular B program Operation sequence 1:2:2
Figure 19: Circular A program - Operation
sequence 1:1:1
Step Step number
demand 1 2 3 4 5 6
+ X
+ X X
+ X X X
+ X X X X
- X X X
- X X
+ X X X
+ X X X X
- X X X
- X X
+ X X X
+ X X X X
- X X X
Step Step number
demand 1 2 3 4 5 6
+ X
+ X X
+ X X X
- X X
+ X X X
+ X X X X
- X X X
- X X
- X
+ X X
+ X X X
+ X X X X
+ X X X X X
- X X X X
- X X X
- X X
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Figure 21: Regulation example - Optimal vs. Normal
Ind
Cap
+4
-4
-4
Steps on :
4
Steps on :
4+4+4+1
Steps on :
4+1
Compensated reactive power
Connection of steps
Disconnection of steps
+4
+1
t
Q
Uncompensated reactive power
Optimal Stepping Program
Step sizes : 1:2:4:4
+4
-4
Normal Stepping Program
Q
Ind
Cap
Step sizes : 1:2:4:4
+4
-4
Steps on :
4
Steps on :
4+4+4+4
Steps on :
4
-4
-1
+4
+1
+2
t
-4
+4
-2
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USER´S MANUAL
6.2 Manual calculation of response value
Normally the response value, more generally known as the C/K value, is set automatically as
a part of the Auto Setup sequence, but there are cases when these values must be entered
manually. The correct value can be calculated using an equation requiring the 1st step size
(in vars), line-to-line voltage of the network used (in volts) and the CT ratio as follows
where Q
1st
= size of 1
st
step in vars
U
LL
= line-to-line voltage in volts
I1/5A = CT ratio
Alternatively, the C/K value can be taken from the table below (valid for 400 V networks)
Table 1: C/K-values for 400 V network
By successive connections (or disconnections) of steps we adjust the reactive power between
two symmetrical limits corresponding to response value
n1/n
2
Smallest step (kvar)
12,5 20 25 30 40 50 60 100
100/5 0,91 1,44
150/5 0,60 0,96 1,20 1,44
200/5 0,45 0,72 0,90 1,08 1,44
250/5 0,36 0,58 0,72 0,87 1,16 1,44
300/5 0,30 0,48 0,60 0,72 0,96 1,20 1,44
400/5 0,36 0,45 0,54 0,72 0,90 1,08
500/5 0,29 0,36 0,43 0,58 0,72 0,87 1,44
600/5 0,30 0,36 0,4 0,60 0,72 1,20
800/5 0,27 0,36 0,45 0,54 0,90
1000/5 0,29 0,36 0,43 0,72
1500/5 0,24 0,29 0,48
2000/5 0,22 0,36
2500/5 0,29
3000/5 0,24
35
/
1
1
××
=
LL
st
UAI
Q
KC
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Figure 22: Compensation example and consequences
6.3 High Voltage use of NR6/NR12
This controller is primarily intended for LV network, but may be used in HV networks under
the commissioner’s full responsibility, if the following points are taken into account.
Connections must employ VT and CT with respect to the following figure.
In HV applications the power values displayed in Measurement Menu represent only the secondary
side values of the VT. To avoid potential misunderstandings, set the CT ratio to percentage
scale.
Safety (or reconnection) delay must be adapted to the value of the discharge resistors of the
capacitors, the most usual value is 10 minutes (600 seconds). The controller’s default response
delay is adapted for LV use. Using too short a response delay may damage the capacitors.
Important:
• the whole commissioning process must be performed using the Manual setup menu and
Parameter menu
• the commissioner should not use Bank Pre-Configuration and Commissioning menus
• the use of Auto Setup menu is strictly forbidden to prevent capacitor destruction
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Figure 23: HV use of the controller
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ALARMS Alarms Menu
ALRM.SET Alarm Setup (Enable/Disable)
AUTO Automatic search of C/K response value
AUTO.SET Automatic Setup Sequence
BANK.PRE Bank Pre-configuration Sequence Menu
BANK.TST Bank Test: each step is automatically connected
and disconnected in turn. This facilitates testing of
the operation of each capacitor step contactor.
See also Step Test.
CIRC.A Circular A stepping program
CIRC.B Circular B stepping program
C/K Response value, normally set up automatically by
the controller
CLR.STAT Clear Statistics
COMMISS Commissioning Sequence Menu
COS PHI Target cos value 0,8ind 1.00 0,9cap
CT Current Transformer primary setting, xxx/5 A 25/5 % 6000/5
DELAY Safety Delay or reconnection delay. Response 10s 50s 600s
delay is fixed 20% of reconnection delay. The
default value corresponds to capacitors with
internal discharge resistors 50V 1 min
ENGLISH Language names: English, for instance
ERR NN Error in parameter search or verify. NN= error number
FACTOR.S Restore Factory Settings
IGNORED The controller does not require the information
about step sequence for any program outside
Optimal. The controller defines it automatically.
I HIGH Current too high >115%
I
N
I LOW Current too low <2,5%
I
N
LANGUAG Language Selection for menus
LL Line to Line connection
LN Line to Neutral connection
LV Low Voltage
MAINTEN Maintenance Menu
MAN.SET Manual Setup Sequence Menu
MANUAL Manual setting of C/K response value. See further 0,01 0,50 1,99
MEASURE Measurements Menu
7. Glossary
Display
information
Long form text Min
value
Default
value
Max
value
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N.CONNEC Number of Connections
N.STEPS Number of used steps 1 6/12 12
NORMAL Normal, Standard stepping program
OPTIM Optimal program
PARAMET Parameters Menu
PROGRAM Selection of suitable stepping program between
(see 6.1 Stepping programs)
The controler’s algorithm will try to reach the target
cos
inside a tolerance area dependant upon the
C/K value. It reaches the value by switching on or off
available relevant steps.
Stack
Normal
Circular A
Circular B
Optimal
SEARCH Search (response value, step sizes, wiring...)
SERIAL.N Serial Number of the product (for internal
manufacturer use)
STACK Linear stepping program
STEP.SEQ Setting of Step Size Sequence
1.1.1.1.1 - 1.1.2.2.2 - 1.1.2.3.3 - 1.1.2.4.4 - 1.2.2.2.2 -
1.2.4.4.4 - 1.2.4.8.8 -1.2.3.3.3 - 1.2.3.4.4 - 1.2.3.6.6
This concerns the Optimal program.
Step sequence are predefined with other programs and
modification request are not then taken into account
STEP.TST Step Test: each step can be manually connected and
disconnected. This facilitates testing of the operation
of each capacitor step contactor. See also Bank Test.
TEMP.LIM Temperature Limit (adjustable) 20
°
C50°C60
°
C
Fan switch-on limit is 15°C lower than temperature limit.
THD.U Total Harmonic Distortion of Voltage
THD.U.LIM Maximum Harmonic Distortion of Voltage (adjustable) 5% 7% 20%
U LOW Voltage too low
<85%U
N
UPTIME Uptime (Power On Hours)
VERIFY Automatic verification of parameters
VERSION Software version number (for internal manufacturer use)
VOLTAGE Input Voltage reference value for voltage alarms 80V 400V 460V
WIRING Connections of voltage and current inputs.
Example: U.L2-L3
(Voltage connected between phase 2 and 3)
Example: I.1.AUTO
(Current connected to phase 1 with automatic polarity
selection)
Current polarity selections:
DIR = direct connection
INV = inverted connection
AUTO = automatic polarity (defined by controller)
Display
information
Long form text Min
value
Default
value
Max
value
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8. Technical specifications
Number of steps 6 or 12
Dimensions 155 x 155 x 70 mm
Frequency 48...52 Hz, 58...62 Hz
Measuring current 0...5 A
Measuring and supply voltages 88...130 V
185...265 V
320...460 V
Relay outputs 120 Vac/5A, 250 Vac/2A, 400 Vac/1A
110 Vdc/0,3A, 60 Vdc/0,6A, 24 Vdc/2A
Display LCD glass with 160 symbols, backlighted
Protection class IP41 front panel, IP20 rear part
Target cos
-range 0,85 ind...1,00...0,90 cap
Response limits, C/K 0,01...1,99 symmetrical
Reconnection delay 10...600 s
Response delay 20 % of reconnection delay, min. 10 s
Displayed measurements cos
, P, Q, S, THD(U), temperature
Installation method Panel installation, DIN-rail installation
Casing Impact resistant PC/ABS, UL94V-0
Operating temperature range 0...60°C
Alarm log List of 5 last alarms
Step counters Yes
Fan control with dedicated relay Yes
Accuracy (of FS) Is: 5%
Iq: 5%
U/I-samples: 5%
Phase: 5°
Distortion: ±3 dB (up to 11
th
)
Temperature: ±3°C
CT setting range 25/5...6000/5
Power outage detection Reaction time > 15 ms
Approvals IEC 61010-1
IEC 61000-6-2
IEC 61000-6-4
IEC 61326
Page 32
Schneider Electric Industries SAS
As characteristics and dimensions of our products are constantly
changing, please contact our offices for confirmation.
10/2003Rec NM39EN
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