Thyristor Power Controller
Single Phase Thyristor Power Controller – POW-1-PA
Single Phase Thyristor Power Controller – POW-1-PA-CL
Two Phase Thyristor Power Controller – POW-2-PA
Two Phase Thyristor Power Controller – POW-2-PA-CL
Three Phase Thyristor Power Controller – POW-3-PA-CL
Three Phase Thyristor Power Controller – POW-12-PA-CL
Single Phase Thyristor Power Switch – POW-1-ZC
Three Phase Thyristor Power Switch – POW-3-ZC
Three Phase Thyristor Power Switch – POW-12-ZC
Thyristor Power Switch – LTSM
Product Specification :
Model wise descriptions :
|POW-1-PA||Single Phase SCR/Thyristor Power Controller/Regulator for Single Phase Heater.|
|POW-1-PA-CL||Single Phase SCR Power Regulator for Single Phase Heater with Current Control/Current Limit and Over Load Protection.|
|POW-2-PA||Two Phase SCR Power Regulator for Two Phase Heater.|
|POW-2-PA-CL||Two Phase SCR Power Regulator for Two Phase Heater with Current Control/Current Limit and Over Load Protection.|
|POW-3-PA-CL||Three Phase SCR Power Regulator for Three Phase Heater connected in 3 or 4 Wire Star or 3 Wire Close or Open Delta Configurations with Current Control/Current Limit and Over Load Protection.|
|POW-12-PA-CL||Three Phase SCR Power Regulator suitable for Three Phase Heaters connected in Star or Delta Configuration.|
|POW-1-ZC||Single Phase Zero Cross Over Pulse Width Modulated SCR Power Switch.|
|POW-3-ZC||Three Phase Thyristor Power Switch suitable for Three Phase Heaters connected in 3 Wire Star without Neutral or in Close Delta (2 leg control mode) (20 KW/30A to 360KW/500A @ 415VAC).|
|POW-12-ZC||Three Phase SCR Power Switch suitable for Three Phase Heaters connected in 3 Wire Star without Neutral or close Delta with 2 leg control (1.5KW/3A to 18KW/30A @ 415VAC).|
|LTSM||Thyristor Power Switch Module for Capacitor Bank.|
Note : For single phase heaters within 8 KW – our low cost model LTC-16 given in 21.2 can be considered.
• 15 Amps to 350 Amps capacity (1KW to 180KW).
• Single phase / 2 phase / 3 phase versions.
• Suitable for 4 wire star with neutral / open delta 6 wire configuration.
• Auto / Manual operation.
• Accepts (4-20)mA / (0-5)VDC / (0-10)VDC control input.
• Soft start for smooth control.
• Adjustable power and current limit.
• Isolated heat sink for safety.
• Simple and Modular design for easy servicing of cards and thyristors.
• Ideally suitable for resistive, transformer, inductive or heating loads like Silicone Carbide and Molybdenum which exhibits significant changes of
• resistance with increase in temperature.
• Other features like partial load failure detection can also be optionally provided
The Thyristor Power Pack has a varied application and can be used with heating elements like Kanthal, Super Kanthal, Silicon Carbide, Molybdenum, Infra Red, etc. where precise and accurate power control is required. There is significant power savings with respect to conventional contactor type temperature control system, which also depends on various other factors.
Description of Thyristor Power Controller :
Libratherm offers ready to use SCR power controller for electrical heating loads ranging from 3 KW/Single phase to 300KW/3-phase. This power pack module comprises of suitable triggering card model LTC-12 or LTC-13 or LTC-15, suitably rated back to back connected SCR module (with electrically isolated base)- mounted on the appropriately rated heat sink (natural air or forced air cool), input and output clip-on type heavy duty connectors or copper bus bars, semiconductor fuses and thermal cutouts. The entire assembly is mounted on MS powder coated plate, which in turn can be easily mounted inside the closed control panel as desired. Complete ready to use control panel with suitable PID / Program temperature controller can also be supplied as per the user’s specifications and requirement.
Technical Specifications :
|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|
|Output||0 to 230VAC or 0 to 415VAC variable voltage proportional to the control signal.|
|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)|
||For adjusting voltage and current per phase using on card presets|
|Load Type||Suitable for both resistive and inductive / transformer load
(15A to 500A @ 110/230/415 VAC)
|Supply Voltage||120/240/380/415 VAC, 50/60 Hz. (User should specify)|
|Available Models||a) Single Phase power pack POW-1
b) Two Phase power pack POW-2
c) Three phase power pack in star with neutral 4 wire configuration –POW-3S
d) Three phase power pack in six wire open delta configuration – POW-3D
|Other accessories provided with each power pack||a) Semiconductor fuse per phase – to protect thyristors against short
b) Thermal cut out switch on heat sink – to protect thyristors against
c) Cooling fan on heat sinks for thyristors above 50Ampere
d) Heavy duty input/output terminals or Copper Busbars 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|
KW (Kilowatt) wise selection table for resistive heating loads :
|Load Current per Phase to Neutral Or Phase1 to Phase 2 AMPS||POW1
@ 230 VAC (Vxi)KW
@415 VAC (Vxix3) KW
(27A SCR module)
|2-10 KW||3-15 KW||6-30 KW
(57A SCR module)
|6-10 KW||11-20 KW||16-30 KW||31-60 KW
|11-18 KW||21-36 KW||31-54 KW||61-108 KW
|19-20 KW||37-40 KW||55-60 KW||109-120kW
|21-30 KW||41-60 KW||61-90 KW||121-180KW
|31-40 KW||61-80 KW||91-120 KW||181-240 KW
|41-50 KW||81-100 KW||121-150 KW||241-300KW
|51-60 KW||101-120 KW||151-180 KW||301-360KW
|61-80 KW||121-160 kw||181-240 KW||361-480KW
|81-100 KW||161-200 KW||241-300 KW||481-600KW
• User can select the required power pack – either by actual current through the heaters or by KW of the heaters.
• Single phase, two phase or three phase selection can be done by selecting appropriate model from the table given above.
• If the heaters are designed at different voltage other than 230VAC or 415VAC, still the selection can be based on the actual current flowing through the heaters at the desired voltage level.
• For inductive / transformer load, the desired KW can be selected as per the requirement.