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Thyristor Power Controller

Thyristor Power Controller

Product Specification :
Model wise descriptions :

Sr.No. Product Description Size (mm.)
21.3.1 POW-1 Single Phase SCR Power Controller for single phase heaters
21.3.2 POW-1-CL Single Phase SCR Power Controller for single phase heaters with current limit and current trip features
21.3.3 POW-2 Tow Phase SCR Power Controller for two phase heaters
21.3.4 POW-1-CL Tow phase SCR Power Controller-suitable for 3 phase heaters with current trip features
21.3.5 POW-2 Three phase SCR Power Controller-suitable for 3 phase heaters connected in 3 wire Star wirh neutral configuration
21.3.6 POW-2-CL Three phase SCR Power Controller-suitable for 3 phase heaters connected in 3 wire star withaiut neutral configuration
21.3.7 POW-3S-4 Three phase SCR Power Controller-suitable for 3 phase heaters connected in 4 wire star with neutral configuration with current limit and current trip features
21.3.8 POW-3S-3 Three phase SCR Power Controller-suitable for 3 phase heaters connected in 3 wire star without neutral configuration with current limit and current trip features
21.3.9 POW-3S-4-CL Three phase SCR Power Controller-suitable for 3 phase heaters connected connected in open 6 wire configuration
21.3.8 POW-3S-3-CL Three phase SCR Power Controller-suitable for 3 phase heaters connected connected in open Delta 6 wire configuration with current limit and current trip features
21.3.9 POW-3D-6 Three phase SCR Power Controller-suitable for 3 phase heaters connected in open Delta 6 wire configuration
21.3.10 POW-3D-6-CL Three phase SCR Power Controller-suitable for 3 phase heaters connected connected in open Delta 6 wire configuration with current limit and current trip features
21.3.11 POW-3D-3 Three Phase SCR Power controller suitable for 3 phase heaters connected in close Delta 3 wire configuration
21.3.12 POW-3D-3-Cl Three Phase SCR Power controller suitable for 3 phase heaters connected in close Delta 3 wire configuration with current limit and current trip features

Note : For single phase heaters within 8 KW – our low cost model LTC-16 given in 21.2 can be considered.

Features :

• 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

Applications :
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)
Settings
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
circuit condition.
b) Thermal cut out switch on heat sink – to protect thyristors against
over heating
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
POW
2@ 415
VAC (Vxi)KW
POW-3s
POW-3s-3
@415 VAC (Vxix3) KW
POW-3D-6
POW-3D-3
@415 VAC
(Vxix1.732)KW
25A
(27A SCR module)

1-5 KW

2-10 KW 3-15 KW 6-30 KW
3-17 KW
50A
(57A SCR module)
6-10 KW 11-20 KW 16-30 KW 31-60 KW
18-33 KW

90A
(91A SCR module)

11-18 KW 21-36 KW 31-54 KW 61-108 KW
34-62 KW

100A
(106A SCR module)

19-20 KW 37-40 KW 55-60 KW 109-120kW
63-69 Kw

150A
(162A SCR module)

21-30 KW 41-60 KW 61-90 KW 121-180KW
70-104 KW

200A
(250A SCR module)

31-40 KW 61-80 KW 91-120 KW 181-240 KW
105-138 KW

250A
(250A SCR module)


41-50 KW 81-100 KW 121-150 KW 241-300KW
173-207KW

300A
(330A SCR module)

51-60 KW 101-120 KW 151-180 KW 301-360KW
173-207KW

400A
(500A SCR module)

61-80 KW 121-160 kw 181-240 KW 361-480KW
208-277KW

500A
(500A SCR module)

81-100 KW 161-200 KW 241-300 KW 481-600KW
278-346KW

• 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.

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