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 2 to 16 zone control panel for hot runner temperature control system,widely used in plastic injection moulding. The panels are designed taking into consideration all the required controlling and safety features to accurately maintain the desired temperature of all the zones.. The main components of the control panel are listed below.

1) PID temperature controller model PID-723 : This controller accepts the input from either
K type or J type thermocouple or from RTD (Pt-100) sensor. The control output is in the form of DC pulse to drive external solid state relay or in the form of 4-20mA/0-5V signal to drive phase angle control SCR power regulator (model LTC-16). The built in Power limit and Ramp time features allows the gradual heating to evaporate the moisture content in the heaters. The ramp heating can be achieved by opting for the SCR control instead of SSR control. The controller has dual display, the upper display shows the heater temperature
and the lower display shows the heater current. The heater current in the form of 4-20mA signal is received from the separate heater monitoring card (HMC-8) as the second input. PID-723 has the built in logic to detect the heater break condition and to generate the HBA alarm. HBA relay output is also provided to activate audio/visual alarm. Depending upon the required number of heating zones, the number of PID controllers are used in the panel.

2) SCR based Heater power Regulator (LTC-16) : This power control module accepts the control signal of 4-20mA / 0-5V from the PID controller and in turn regulates the heater power very precisely. This module also has built settings for power limit, ramp up and ramp down for gradual increase and decrease of current flowing through the heater. The
Phase angle control technique is used to fire the back to back connected SCRs – thereby giving smooth and uniform power control across the heater. The SCRs are rated suitably to control heater of up to 4 KW @ 230VAC. All the terminals for heater connections are brought out on the back panel terminals.

3) Heater Monitoring Card (HMC-8): This card is integrated and wired in the same control panel, which accepts the heater current through built in CT and converts the same to proportional (4-20)mA signal. This signal is connected to the PID controller as the second input to display the heater current and to generate the HBA condition.

4) Pulse Width Modulation Card (PWM-4) : This card is mainly used for the manual control of the heater power using front panel potentiometer. For the SCR based control panel, the heater power can be controlled manually in the MANUAL mode by feeding the analog signal to the SCR firing module. But for SSR based control panel – the manual operation is carried out using the PWM card. This card accepts the analog signal from the front panel
potentiometer and generates the time proportional (variable duty cycle) pulse for the SSR. The percentage of power to be delivered can be set using the front panel potentiometer dial – marked as 0 to 100% power. Each such PWM-4 card can control 4 heaters in the manual mode.

5) Other Panel Accessories : Apart from the above important components, the panel is integrated with the banana terminals for thermocouples, Heavy duty mutli-pin Male/Female connector for the heaters, RYB phase indicating lamps, audio/visual alarm for HBA, Heavy duty plug / socket for the incoming mains supply, 2 pole MCBs in series with
each heater and cooling fan to exhaust out the heat generated inside the panel. The panel is MS fabricated and duly powder coated for the lasting operation in the industrial environment.