Our product SCR firing and triggering cards using phase angle control technique for single,two or three phase heater control and DC rectifier. Using synchronized phase angle control technique. Models : LTC-12, LTC-13, LTC-14 and LTC-15

Design	Digital and Linear circuit based
Control Technique	Phase angle control – synchronized for each phase.
Input Control Signal	(4-20)mA, or (0-5)V or (0-10)VDC or external 10Kohms potentiometer.
Outputs	Suitable Gate Kathode triggering pulses to fire back-to-back connected SCRs. G1K1 + G2K2 using LTC-12, LTC-13 and LTC-14 (for Single and Two phase supply) G1K1 + G2K2 X 3 using LTC-15 (for Three phase supply)
Smooth Control	On card setting to adjust Ramp Up and Ramp Down Time for soft increase and decrease of output voltage.
Current Control	Using On card Current Limit and Trip settings – using presets. (LTC-13 and LTC-13/D).
Voltage Settings	For adjusting max / min voltage per phase
Supply Voltage	110/230/380/415 VAC, 50/60 Hz. Configuration dependent
Load Configuration	Single LTC-12 or LTC-13 card can be used for single phase or two phase load. Three nos. of LTC-12 or LTC-13 card can be used for three phase star or delta load Single LTC-15 card can be used for three phase star or delta load.
Sizes (Triggering Card) in mm.	230 x 80 x 180 (LTC-12) 230 x 80 x 180 (LTC-13) 65 x 80 x 125 (LTC-14)--- DIN rail mount. 125 x 160 x 70 (LTC-15)
Mounting	All these cards can be mounted inside the control panel.

Our range of SCR Triggering or Firing card for single phase and three phase load is used for burst firing control technique. Models: SCRF-4

Item	SCR Firing Card with ZERO cross over
Model	SCRF-4
Control Input Logic level	3 to 32 VDC
No. Of Outputs	4 nos. of back to back connected SCRs can be fired using single card.
Triggering Pulses	Gate/ Cathode pulse - isolated from the Input
Output Line Voltage	110VAC/230VAC/415VAC (50 to 440VAC)
Mounting	35 mm. DIN rail or can be mounted on surface with screws
Size	As per standard
Wiring Details	Please contact us for complete wiring details for single phase, two phase or three phase loads.

Our range of single, two and three phase heater power controller are suitable for triggering pulses to fire back-to-back connected SCRs. Models: POW-1, POW-2, POW-3/S and POW-3/D

Available Ratings	3KW Single phase to 300KW Three phase
Available Configuration	Single phase, Two phase, Three phase (3 or 4 wire star and 6 wire delta)
Control Action	Phase angle control (self synchronized)
Control Signal	(4-20)mA / (0-5)VDC / (0-10)VDC / Potentiometer (Control signal available from PID temperature controller.
Output	Suitable Triggering pulses to fire back-to-back connected SCRs.
Smooth Control	Adjustable Ramp Up and Ramp Down Time for soft increase and decrease of output voltage.
Current Control	Using Current Limit and Trip settings on card. (LTC-13)
Settings	For adjusting voltage and current per phase
Load Type	Suitable for both resistive and inductive / transformer load (15A to 300A @ 110/230/415 VAC)
Availability	In the form of 1, 2 & 3 phase triggering cards, complete Thyristor power pack or ready to use control panel with suitable PID or Program controller. Triggering cards are also suitable for 1 & 3 phase rectifiers.
DC rectifier application	Using LTC-15 card 6 SCRs can be controlled in full wave bridge configuration.
Supply Voltage	230/380/415 VAC, 50/60 Hz.
Available Models	Single Phase power pack POW-1 Two Phase power pack POW-2 Three phase power pack in star with neutral 4 wire configuration – POW-3/S Three phase power pack in six wire open delta configuration – POW-3/D
Other accessories provided with each power pack	Semiconductor fuse per phase – to protect thyristors against short circuit condition. Thermal cut out switch on heat sink – to protect tyristors against over heating Cooling fan on heat sinks for thyristor above 50Ampere Heavy duty input/output terminals for supply and heater connections.
Size (Power Pack)	As per Std.
Mounting	Power pack can be mounted on the base plate of the control panel

Libratherm offers ready to use control panel for electrical furnaces, ovens or any other electrical heating system, which can be used by the OEMs or the end users. The panels are fabricated as per the auto-cad drawing using the high grade steel and are duly powder coated. The size, volume and the air circulation arrangement of the panel is chosen as per the requirement. Depending upon the requirement and application of heating system and desired degree of temperature accuracy the temperature controllers, controlling method and the end controlling device is selected. The panels can be supplied for single phase load or three phase load. The main controllers can be simple On/Off controllers (model DTC-300, DTC-720) or more precise single or multi loop PID controllers (model PID-300, PID-966, PID-723 or PID-8000) or the single or multi zone Ramp/Soak profile programmers (model PRC-300, PRC-309, PRC-8000 etc…) The parallel safety controllers can be selected as model DTC-300 or linearized controller model DLC-301. The final controlling device can be a suitably rated electromechanical contactor or solid state relays for single and three phase load. For larger capacity heating systems requiring precise control, thyristor power controllers (either phase angle controlled or burst firing control) are incorporated, having single phase, two phase or three phase star/delta load configuration. The suitably rated heavy duty terminals or bus bars are provided for heater and power line connections. The load connections are isolated using the suitable contactors in series to isolate the heating system during maintenance of the panel or the heater load. The front of the panel incorporates all the required switch gear components and meters to make the user friendly and safe operation of the panel. The incoming power line MCBS or MCCBS of suitable ratings are used for switching the electrical supply to the panel. Suitably rated fuses are incorporated per phase or per heating arm. Digital or Analog current meters are installed on the panel to monitor the current flowing through the load.