1. VARLOGIC NRC12 Varmetric Controller

2. NRC12 positioning An even higher level of performance
In addition to Varlogic NR6/NR12 functions, the Varlogic NRC12 controller also offers:
additional measurements: percentage of harmonic current distortion, spectral analysis of network harmonic currents and voltages,
the solution to specific applications
4 quadrants, dual cos j, medium voltage application, fixed step
improved capacitor bank and step status monitoring
easier-to-read interface with graphic display and online help.
A communicating model
optional communication auxiliary (RS485 Modbus)

3. Interface 7 buttons: F1/F2: screen navigation Screen: Help graphic
4 navigation buttons
Screen:
graphic
backlit

4. Interface: sample screens

5. Interface: Menu structure

6. Technical data (1) General data operating temperature: 0…60°C
storage temperature: – 20°C…60°C
standards: IEC/EN EMC: IEC UL certification
flush-mounted or mounted on 35 mm DIN rail (EN 50022)
flush-mounting protection class: front panel: IP41
rear panel: IP20
display: NR6, NR12 type: 65 x 21 mm backlit screen
NRC12 type: 55 x 28 mm backlit graphic screen
languages: English, French, German, Portuguese, Spanish
alarm contact
internal temperature sensor
separate cubicle fan control contact
access to the alarm history.

7. Technical data (2) Inputs
type of connection: phase-to-phase or phase-to-neutral
insensitive to CT connection polarity
insensitive to phase rotation direction
NRC12 : separate measurement and supply input
NRC12 : measurement input up to 690 V
current input: NR6, NR12 type: CT… X/5 A
NRC12: CT… X/5 A and X/1 A
input for dual cos phi control
external temperature sensor input
Outputs
dry contacts: AC: 1 A/400 V, 2 A/250 V, 5 A/120 V
DC: 0.3 A/110 V, 0.6 A/60 V, 2 A/24 V

8. Technical data (3) Settings and parameters
target cos j setting: 0.85 ind…0.9 cap
possibility of dual cos j set point (NRC12 type)
manual or automatic setting of controller parameters
choice of programs: linear, normal, circular, optimised
main step sequences:
time delay between successive same step energisations:
- NR6, NR12 type: 10 … 600 s / - NRC12 type : 10 … 900 s
step configuration parameter setting : fixed, auto, disconnected
4-quadrant operation for generator application (NRC12)
parameter setting for MV operation with a PT
manual operating test control.

9. Available measurements and information
NR6/NR12 NRC12 information supplied
Cos j, steps energised
Counter recording the number of operations and the step operation time
Step configuration (fixed, auto, disconnected)
Step status (capacitance loss monitoring)
Network characteristics: apparent and reactive currents, voltage, power
Temperature inside the cubicle and remote measurement by external sensor
Percentage of total harmonic voltage distortion THD (U)
Percentage of total harmonic current distortion THD (I)
Capacitor bank current overload (Irms/I1)
Harmonic voltage and current spectrum (H 3, 5, 7, 11, 13)
Alarm history

10. Alarms and protective devices

11. Varlogic: Product range and models
Model NRC12 available only in the Merlin Gerin version

12. General communication architecture

13. Varlogic communication architecture

14. Varlogic communication composition
CCA : Controller Communication Adapter
installed on the controller, used to connect the optical fibre
Optical fibre
connects the CCA to the MCU
MCU : Modbus Coupler Unit
Modbus network connection
RS485 interface, 2/4 wires

15. Varlogic communication characteristics
Modbus RTU protocol
RS 485, 2/4 wires
Screw terminal connection
Modbus slave
address 1 to 247
baud rate 1200 to 38400
MCU supply: 10 …30 V DC, 10…20 V AC
Certification: Modbus over serial line interoperability test

16. Communication connection

17. Communication parameter setting (1)

18. Communication parameter setting (2)

19. Communication data Data tables
All the Varlogic data can be accessed via Modbus communication
measurements: read
parameters: read / write
Communication via EGX 400 gateway
read only data
main measurements
alarms