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ENG
AUTOMATION
MULTIFUNCTION CONTROLLER
2850T / 3850T SERIES
CODE 81371B
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A SINGLE CONTROLLER FOR DIFFERENT USES
Gefran’s catalog has a new series of controllers for applications that require control, datalogger, and setpoint
functions.
UNIVERSAL MULTILOOP PID CONTROLLER
Independent PID control for each zone.
Cascade control.
Ratio control.
Specific process functions.
Compliance with AMS2750 and CQI-9
for Aerospace/Automotive applications.
DATALOGGER AND BATCH REPORT
Standard CSV file.
Encrypted format.
Report utility for PC.
Graphic trend view.
SETPOINT GENERATOR
Synchronous setpoint profiles.
Asynchronous setpoint profiles.
Up to 4 SP profiles (Ramp&Soak)
for each program.
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… AND MUCH MORE
GETlogic
2850T/3850T
A
IN
MAX
B
MIN
C
OUT
Control logics.
Process interlock.
Mathematical functions.
Process functions.
GETview
Custom graphic pages.
CONNECTIVITY
VNC remote service.
Modbus TCP fieldbus.
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Examples of cascade control
Exchanger
Measurement
UNIVERSAL MULTILOOP CONTROLLER
0 1 2 3 4 5 6 7 8
SCALABLE AND EFFICIENT PID CONTROL
Gefran’s 2850T – 3850T series of controllers provides multiloop PID control solutions with advanced control
functions and simple configuration.
The controllers use a cutting-edge PID control algorithm for high performance and reliable process control.
Each PID can be easily configured as a single loop controller, connected to the profile generator, as a cascade
controller or ratio controller.
Compliance with AMS2750 and CQI-9 standards, allows to use Multifunction series in Aerospace and Automotive
applications, as a temperature PID controller and data logging.
AUTOTUNING
The controllers have an efficient tuning algorithm that ensures stable and
accurate temperature control, preventing overshoots and oscillations even
in critical or very fast thermal processes.
PROCESS FUNCTIONS
Heat treatments and sterilization processes require specific functions to ensure a satisfactory result and, in
many cases, to certify the finished product.
Gefran integrates some of the most common process functions in its 2850T and 3850T controllers. One of these
functions is the F0 algorithm for calculating the sterilization coefficient, used in sterilization applications to
check, guarantee, and certify the quality parameters of the treated product.
Process Fluid
Steam
Valve
Steam
FT
100
FIC
100
Flow Controller
(secondary)
Shell and Tube Heat
TIC
100
TT
101
Temperature
Controller
(primary)
Temperature
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Kp = 5
K
1
K
d
= 3
= 0.8
CASCADE CONTROL
Cascade control is a system with two inputs and one output, with two nested
PIDs, the first of which supplies the setpoint for the second.
This system guarantees more stable temperature control and reduces the
error between the measured and set value.
On the other hand, if you have to control a variable based on another one
and keep a constant ratio between them (for example, a mix of fluids), ratio
control is the answer.
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2850T/3850T
EASY AND FLEXIBLE SETPOINT GENERATOR
Heat treatment requires change of the setpoint over time for the various PID controls. The 2850T/3850T series
meets this requirement by configuring profile generators.
The profile generator provides simple configuration of setpoint profiles and programming of assigned events.
It can be programmed online directly on the controller or offline with a dedicated editor in GF_eXpress
configuration tool.
A setpoint generator program consists of:
Segments: Up to 4 setpoints that follow the configured
profile.
Events: series of conditions or commands assigned to
each segment.
Logic: list of logic and math instructions executed with
the active program.
Report: during program execution, archiving of a
series of values used to certify the production.
SYNCHRONOUS MANAGEMENT
The setpoint generator can be configured with synchronous management
(all profiles can be executed with common time bases).
ASYNCHRONOUS MANAGEMENT
The setpoint generator can be configured with asynchronous management
(each profile can be executed with independent time bases).
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DATALOGGER AND BATCH REPORT
MULTICHANNEL GRAPHIC RECORDER...
The 2850T/3850T series combines process data archiving with safe and easy access, all in a compact controller
with a bright color touchscreen. The data can be displayed in graphic trend mode, a cursor allows a quick and
easy reading, of a series of values in a selected time.
All process data are archived safely in the controller’s memory and can be saved either in standard (.CSV) or
encrypted files and exported via USB or Ethernet.
BATCH REPORTS
The batch report option lets you archive process data, In/
Out event status and production process alarms.
Data archived as batch reports can be used as production
reports or quality reports.
DATALOG
The Datalog option with Real
Time Clock (RTC) lets you
archive process data, In/Out
event status and alarms in
standard (.CSV) or encrypted
files.
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…REMOTE DATA ARCHIVING AND MANAGEMENT
ETHERNET TCP/IP
PC REPORT UTILITY
2850T/3850T
The 2850T/3850T series has a dedicated PC utility that
manages the datalog files and batch reports archived
in the controller. The utility lets you automatically (with
manual command or configurable time interval) copy and
delete files archived in the controller from a PC linked in
Ethernet.
Data archived on the PC can be displayed in graphic Trend
or tabular (Excel) format. They can also be exported in
standard .CSV or .PDF format.
TIME SYNCHRONIZATION (SNTP)
For precise archiving of the date/time of datalog archive data, the
controller supports the Simple Network Time Protocol (SNTP) service.
The SNTP service automatically updates the controller’s date/time by
means of connection to an SNTP server linked via Ethernet.
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A SINGLE CONFIGURATION TOOL
GF_eXpress
GF_eXpress is the software configuration suite for all Gefran devices. A series of dedicated graphic interfaces,
allows a clear and simple controller configuration.
Ethernet
CONFIGURATION PARAMETERS
Direct access to all configuration parameters in a simple
and immediate list.
An integrated monitor window, in oscilloscope style, helps
control tuning operations.
CONTROL LOGICS
A fully graphic interface with On-line test functions is
included for control logic configuration to quickly and
securely check the control or mathematics function
sequence.
CUSTOM PAGES
Custom page configuration is available via a fully graphic
simple and intuitive interface.
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...AND ALL AT YOUR FINGERTIPS
CONFIGURATION PARAMETERS
Direct access from touch interface to all parameters
with 3-level password protection.
2850T/3850T
GETlogic
This is the Gefran technology to directly set up all logic
and mathematics functions from the tool.
A
B
IN
MAX
MIN
A B
OUT
C D
C
GETview
GETview is the function that lets users build man-machine
interface pages directly from the touch-screen.
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ALSO REMOTELY
FACTORY INTEGRATION AND SYSTEM DIAGNOSTICS
2850T/3850T series controllers are ready for connection to centralized acquisition or control systems such as
HMI or DCS for integration in factory management. This is done by means of an Ethernet TCP/IP connection
based on standard Modbus TCP protocol.
You can also access the system remotely by PC, tablet or smartphone with the standard VNC service.
In case of failure, the controllers provide clear diagnostics, such as fault, interrupted load, off-scale, etc.
ETHERNET TCP/IP
ETHERNET TCP/IP
INPUTS - OUTPUTS
2850T MODEL 2850T-XX-4 2850T-XX-8
Analog (universal) Ins
Analog Outs (V, mA)
Digital Ins (0-24 VDC)
Digital Outs (0-24 VDC)
Current transformer inputs
Tot
3850T MODEL 3850T-XX-4 3850T-XX-8 3850T-XX-12 3850T-XX-16
Analog (universal) Ins
Analog Outs (V, mA)
Digital Ins (0-24 VDC)
Digital Outs (0-24 VDC)
Current transformer inputs
Tot
4 8 12 16
2 4 6 8
8+16 16+16 24+16 32+16
8+16 16+16 24+16 32+16
2 4 6 8
56 80 104 128
4 8
2 4
8+16 16+16
8+16 16+16
2 4
56 80
1010
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APPLICATION EXAMPLES
Ammonia
AUTOCLAVE STERILIZATION
2850T/3850T
Autoclave sterilization applications require
PID multiloop functions, time base control
programs, and logging of production data. They
generally require 2 PID loops (Temperature and
Pressure) linked to a setpoint profile generator.
The main characteristics of these applications
are the archiving of process values during the
Internal pressure
Internal temperature
T
P
TT
Heating control
Food temperature
Pressure control
sterilization cycle and the calculation of F0, i.e.,
the time equivalent to sterilization temperature.
FO calculation lets you automatically check,
ensure, and certify the quality parameters of
the treated product.
NITRIDING FURNACE
Nitriding is an industrial steel surface hardening
process, also called low temperature case
hardening. The process consists in bringing steel to
a temperature between 480-570°C and introducing
ammonia (NH3) which, through a chemical reaction,
frees nitrogen atoms (N2) that are absorbed by the
ferrite metal surface forming nitrides.
Ammonia On/Off
Nitrogen On/Off
Nitrogen
(N2)
Pressure
Temperature
Temperature
Heating
control
P
T1
PRODUCT
T1
(NH3)
The advantages for the material with nitriding are:
- Surface hardness and wear resistance.
- Tempering stability and thus heat hardness.
- Resistance to fatigue and scoring.
- Rust resistance
- Dimensional stability.
The process requires two PID control loops and two
profile generators. A furnace temperature control
profile and an ammonia dissociation factor profile.
During some heat process phases, the supply
of technical gas required for the nitriding and
tempering process are controlled.
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