Merlin Gerin Varlogic NR6 User manual

Varlogic NR6, NR12
Power factor controller
User manual

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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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
ADisplay
BKeys
COpening of door
DDoor
EAlarm information
FMounting bracket for panel mounting installation

Rear view:
Legend
Side view:
Legend
See Chapter 8 for technical specifications.
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GStep output connectors
HSpecification label
IMounting bracket for panel mounting installation
JFixing spring for DIN-rail mounting
KCurrent/voltage connection inputs
LFan and alarm outputs
MDIN-rail mounting installation area
NScrewdriver 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.

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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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 pre-
configuring the bank at the workshop. After pre-
configuration, 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 pre-
configured, 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 pre-
configured, 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 pre-
configuration 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

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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Figure 10: Commissioning

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 1st 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 1st 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 (1st 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 voltage-
and 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 1st step in the
bank
to

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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

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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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.