Prices are inclusive of Delivery Charges.
TSC-307 – Three Phase Zero Cross Over thyristor Triggering / SCR Firing Card for 3 leg control.
Libratherm offers Thyristor Switch Card TSC-307, which has been specially designed for switching 3 phase Resistive or Capacitive load. This SCR Switch card generates 3 sets of gate/cathode firing pulses to trigger 3 sets of back to back connected silicon controlled rectifiers (SCRs) or thyristors. The gate/cathode triggering pulses are generated using zero cross over cathodic firing techniques. The 3 sets of gate/cathode pulses (12pulses) are galvanically isolated using the on card ferrite core pulse transformers.
TSC-307 accepts 3 independent or one common linear signal of 4-20mA/0-5V/0-10V/Potentiometer or DC pulse/Contact input from temperature controller or from PLC and generates 3 independent gate cathode triggering pulses (G1K1+G2K2) for 3 pairs of back to back connected SCRs. Hence, one can control 3 independent single-phase loads or a single 3 phase load in star or delta configuration. The linear signal is pulse-width modulated to generate pulsating output with the variable on/off duty cycle time of 2 to 30 seconds, adjustable using on card potentiometer.
Each card can simultaneously trigger 3 sets of back to back SCRs or 3 thyristor modules (such as SKKT series of Semikron) to switch 3 phase load banks.
The SCR Firing Card TSC-307 has the provision to accept 2 external thermostat contacts, which can be used to operate the cooling fan mounted on the heat sinks and to trip the circuit in case of overheating. On card LED indicates the on/off status of incoming DC power supply, ON/OFF status of load banks, and status of heat sink temperature.
|Item||Zero cross over SCR Firing Card for 3 phase Resistive Heaters/Capacitor bank selection.|
|Model||TSC-307-S (Stud mounting) and TSC-307-D (DIN rail mounting).|
|Control Command||12 to 24DC pulse or potential-free contact from an external controller or
4-20mA/0-5V/0-10V linear analog signal from an external controller.
|Triggering Pulses||12 Gate/Cathode pulses - for back to back connected SCRs modules.
G1K1+G2K2, G3K3+G4K4 and G5K5+G6K6
|Triggering Technique||Guaranteed zero cross over firing to prevent the generation of transients and
harmonics during switching action.
|Firing is automatically synchronized with incoming 3 phase frequency.|
|Switching time||Min. 100mS (5 AC cycles @ 50Hz line frequency).|
|Load Configuration||Load bank in 3 phase delta configuration or 6 wire open delta configuration or
4 wire star with neutral configuration.
|Over Temperature Protection||Facility to accept 2 nos. of thermostat input for fan control and trip function.|
|LED Indications||For Power ON, THY1 ON, THY2 ON, FAN ON, LOAD ON, and Over Temperature.|
|Aux. Supply Voltage||230VAC or 415VAC / 2 phase, 50Hz +/-10% (Anyone to be specified).|
|Three Phase Line Voltage||110 to 500VAC (Special cards are available for 690/750VAC line supply).|
|Mounting||It can be easily mounted on the 35 mm DIN rail or on the base plate.|
|Card Size||250 (L) x 110 (W) x 70 (H) mm. (TSC-307-S)
255 (L) x 115 (W) x 70 (H) mm. (TSC-307-D)
|Sr. No.||Model||Product Description||Part No.|
|1||TSC-307-S||3 phase zero cross over SCR firing card for 3 leg control (Stud mounting)||2204-1|
|2||TSC-307-D||3 phase zero cross over SCR firing card for 3 leg control (DIN rail mounting)||2204-2|