gefran GTF Series - 1.1 GTF Series Profile; 1.2 General GTF Description

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80960G_MHW_GTF_05-2019_ENG
1.1 Profile
The “ GTF” series of microprocessor advanced solid state po-
wer units controls, in compact and optimized size, high electric
powers with different types of heating elements, single-phase,
biphase or triphase.
Current levels range from 40A to 250A, nominal voltage from 480
VAC to 600VAC.
The command input is congurable and accepts 0-10V, 0/4-20mA
signals, potentiometer, logic signals, including with PWM modes
for cost effective solutions.
The device can also be operated via Modbus RTU serial com-
munication, with IN/OUT chain connections facilitated by plug-in
RJ10 (telephone) connectors.
The several trigger modes are software congurable and provide:
- ZC: Zero Crossing constant cycle time (settable in range
1-200sec), for conventional loads
- BF: Burst-Firing, Zero crossing with optimized minimum cycle
time, for systems with low thermal inertia, medium-wave IR lamps
- HSC: Half Single Cycle Zero Crossing corresponds to Burst
Firing that manages single semi-cycles of conduction or stop
cycles, useful for short-wave IR lamps, reduces ickering and
limits generation of EMC noise on the power line (applied only to
single-phase load or open delta).
- PA: Phase angle control, useful for short-wave IR lamps, tran-
sformer primaries. Completely eliminates ickering of load la-
ments, but generates EMC noise on power line (harmonics).
Soft Start and soft stop ramp functions can be assigned to these
controls with limitation of current peaks and/or maximum RMS
current level.
Thanks to sophisticated Hardware and Software solutions, you
can precisely control different types of loads.
Phase angle control (the only control method that completely
eliminates IR lamp ickering), matched with current, voltage, or
load power feedback functions, allows the easy use of “critical”
applications such as (for example), special resistors such as spe-
cial Super Khantal™ heating elements, Silicon Carbide resistors,
or transformer primaries either single-phase or triphase.
GTF runs complete diagnostics of current, voltage, power, and
temperature levels:
Current Diagnostics:
- Total and partial load interrupt alarm
- Self-learn function of alarm limit for interrupted load
- Alarm for SCR in short circuit
- Alarm for load in short circuit or overcurrent
Voltage Diagnostics:
- Alarm for absence of phase
Temperature Diagnostics:
- Alarm for over temperature of power module
Power control with Soft start ramp limits load, optimizes the con-
sumptions and increases the load operating duration.
1 • PRELIMINARY INSTUCTIONS
Device parameters can be congured from PC, by means of a sim-
ple conguration SW which lets you save all parameters in a con-
guration le that is easy to manage and to copy to other devices.
Moreover, an RS485 serial connection of GTF is offered with
Modbus RTU protocol to control currents, voltages, powers, load
status, and device status from the supervisor terminal (HMI) or
PLC.
The section contains general information and
warnings to be read before installing, configuring
and using the controller.
1.2 General DescriPtion
GTF is single-zone advanced solid state power unit, extremely
compact, equipped with different optional functions; it offers an
exclusive combination of performance, reliability, and flexibility.
In particular, this new line of Gefran controllers is the ideal
solution for sectors demanding high performance and continuity
of service, such as:
• Thermoforming
• Blowing
• Hot runners for injection presses
• Texturizing of fibers
• Heat treatment furnaces
• Woodworking machines
• Glass tempering furnaces
The modules series GTF controllers are based on an extremely
versatile hardware and software platform, with options to select
the best I/O configuration for your system.
GTF is used for the power control of single-phase and 2-phase
loads, including resistive loads with high and low temperature
coefficient, short wave IR lamps, or transformer primaries.
Attention: the description of programming and
configuration parameters are contained in the
“Programming and configuration” manual,
downloadable from the website www.gefran.com.