Gefran GTF Data Sheet
GTF
POWER CONTROLLER
Main applications
• Industrial furnaces for heat treatments,
metallurgy
• Fusion, sinterization, nitruration furnaces
• Furnaces for ceramics and precious
metals
• Dryers
• Heating systems with infrared lamps
(long-, medium-, short-wave)
• Wood edge banding Machines
• Plastic-blowing Machines
• Welding applications on Packaging
Machinery
• Thermoforming Machines
• Furnaces with Super Kanthal™ Silicon
carbide heating elements
Main features
• Current levels from 40A to 250A
• Rated voltage 480Vac, 600Vac and
690Vac
• Trigger congurable in “Zero crossing”
(Fixed Cycle, Burst Firing, Half
single Cycle) or “Phase angle”
• Analog control input, congurable in:
Volt, mA, potentiometer (digital in
PWM)
• Total and partial load interrupt alarm (HB)
(optional)
• Communication Modbus RTU, RS 485 2
wires (optional)
• Current limit (optional)
• V, I, P feedback (optional)
• Connections for monophase and triphase
applications (just in zero crossing”
mode)
• Conguration from PC (by USB – TTL
cable)
•
CE, TÜV, UL Marking
PROFILE
The “GTF” series of microprocessor
advanced solid state power unit controls,
in compact and optimized solutions, offer
various power outputs for use with diffe-
rent types of heating elements. Current
levels range from 25A to 250A, nominal
voltage from 480Vac, 600Vac and 690Vac.
The command input is congurable and
accepts 0-10V, 0/4-20mA signals, poten-
tiometers, logic signals, including with
PWM modes for cost effective solutions.
The device can also be operated via
Modbus RTU serial communication, with
cascade chain connections facilitated by
plug-in RJ10 (telephone) connectors.
The many trigger modes are software con-
gurable and provide:
- ZC:
Zero Crossing constant cycle time (setta-
ble in range 1-200sec), for conventional
loads
-BF: Burst-Firing, Zero crossing with op-
timized minimum cycle time, for systems
with low thermal inertia, medium-wave IR
lamps
- HSC:
Half Single Cycle Zero Crossing (corre-
sponding 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 3-phase open
delta 6 leads)
- PA:
Phase angle control, useful for short-wave
IR lamps, transformer primaries.
Completely eliminates ickering of load
laments. Soft Start and soft stop ramp
functions can be assigned to these con-
trols 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 matched with cur-
rent limit and current, voltage, or load
power feedback functions, can be used
with “critical” applications such as (for
example), special resistors such as spe-
cial Super Kanthal™ heating elements,
Silicon Carbide resistors, or transformer
primaries.
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
- Alarm for interrupted internal fuse
Voltage Diagnostics:
- Alarm for absence of phase
Temperature Diagnostics:
- Alarm for over temperature of power mo-
dule
The power control with Soft start ramp li-
mits load current peaks at power-on, oop-
timizes the consumptions and increases
the load operating duration.
Installation notes:
- To ensure maximum reliability, it is
essential to install the unit correctly in
the panel in order to guarantee
adequate heat exchange between the
heat sink and the room under natural
convection conditions.
- Install the unit vertically (max 10°
inclination from vertical axis).
- Vertical distance between unit and panel
wall >100mm
- Use the high speed fuses specied in
the catalog
- Applications with solid state power
units must also include an automatic
safety switch to cut out the load power
line.
A specic, linear Soft Start curve, desig-
ned to control gradually the current in the
initial phase is available for IR lamps.
Device parameters can be congured from
PC, by means of a simple conguration
SW which lets you save all parameters in
a conguration 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 supervi-
sor terminal (HMI) or PLC.
2
DESCRIPTION OF CONNECTIONS GTF 25-120A
KEY HB
Top view
WITH OUT option Fieldbus
J2
TTL port for
PC conguration
Syncronous output for Ma-
ster/Slave connection
Alarm output
(solid state relay - HB option)
KEY HB
J3, J4
RJ10 connectors
RS485 serial line
Modbus
(GND)
Input control signal (+)
Potentiometer output power supply (+5Vdc)
Top view
WITH option Fieldbus
Address x 1
Address x 10
Switch for serial line
Digital input (PWM input)
Power supply terminal 24Vac/Vdc
Green Led (RUN)
Yellow Led (STATUS)
Red Led (Alarm output HB)
Yellow Led (Status digital input)
Led: Green = Thyristor ON
Yellow = Temperature OVER
1/L1
LINE connection
Key HB
J1
Power supply /control
connector
Fixing screw
at heatsink
Identication label
Fixing screw
at heatsink
2/T1
LOAD connection
3/L2
Reference connection
of line voltage
PE
EARTH
GTF 150-250A DESCRIPTION OF CONNECTIONS
Top View
Line voltage
connector
Protection
fan
“Line”
Connection
Line voltage
connector
Screw front cover
(view fuse)
“Line” Connection
RUN .............................. (Green)
STATUS ........................ (Yellow)
ALARM HB ...................... (Red)
STATE DIGITAL INPUT (Yellow)
ON Thyristor ................. (Green)
OVER Temperature ......... (Yellow)
Address Rotary Switch (optional)
(Potentiometer)
Control analog
input connector
“Load” Connection
Low view WITHOUT option RS485 serial line
“Load”
Connection
Protection
fan
Conguration TTL
means of PC
Low view WITH option RS485 serial line
“Load”
Connection
4
Dip Switch
serial line
RJ10 connectors for
Serial RS485 Modbus
DERATING CURVES GTF
GTF 25 / 40
GTF 75 / 90 / 120 GTF 150 / 200 / 250
GTF 50 / 60
Loading...