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Thyristor Power Controller
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 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 cut outs. The entire assembly is mounted on MS powder coated plate, which in turn can be easily mounted inside the closed control panel. The controller is available with suitable PID / Program temperature controller as per requirement.
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.
|
Available
Ratings |
3KW
Single phase to 600KW Three phase |
|
Available
Configuration |
Single
phase, Two phase, Three phase (3 or 4 wire star andÂ
3 or 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. (Settable in the range of 2 to 20 seconds |
|
Current
Control |
Using
on card Current Limit and Trip settings. (LTC-13 and CLM-15) |
|
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 |
 AsÂ
given in the above table (Under Model wise description) |
|
Other
accessories provided with each power pack |
a)
Semiconductor fuse per phase – to protect thyristors against short   Â
circuit condition. RC snubber / MOV across the SCRs to protect   Â
against transients. b)
Thermal cut out switch on the heat sink – to protect thyristors   Â
against over heating c)
Cooling fan on heat sinks for thyristors above 50Ampere d)
Heavy duty input/output terminals or Copper Bus bars for supply and heater
Connections. |
|
Size
(Power Pack) |
As
per Std. (Sizes can be given on request – based on the model) |
|
Mounting
|
Power
pack can be mounted on the base plate of the control panel |
- 15 Amps to 350 Amps capacity (1KW to 180KW)
- Single phase / 2 phase / 3 phase versions
- Suitable for 3 or 4 wire star configuration / 3 or 6 wire delta 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
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