Libratherm Instruments Private Limited
Libratherm Instruments Private Limited
Dahisar East, Mumbai, Maharashtra
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Thyristor Power Controller

Our range of thyristor power controller is used for heating systems and DC rectifiers and ready to use control panels.

Three Phase Thyristor Based Solid State Relay Module SSR-3

Three Phase Thyristor Based Solid State Relay Module SSR-3
  • Three Phase Thyristor Based Solid State Relay Module SSR-3
  • Three Phase Thyristor Based Solid State Relay Module SSR-3
  • Three Phase Thyristor Based Solid State Relay Module SSR-3
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Approx. Price: Rs 12,500 / NumberGet Latest Price

Product Details:

Minimum Order Quantity1 Number
Voltage TypeAC
BrandLibratherm
MountingIndustrial Mounting
Phase3 Phase
Available Ratings3KW to 60KW @ 3 phase 415/440VAC
Output0 to 230VAC or 0 to 415/440 VAC variable on/off duty cycle directly proportional to the control
Load TypeSuitable for resistive heaters.
Incomer Supply Voltage415/440 VAC, 50/60 Hz. (User should specify)
Dimensions165 x 170 x 145 (h x w x d) mm. for 25A and 50A module. 230 x 190 x 170 (h x w x d) mm. for 100A
Mounting In PanelThyristor module can be mounted on the base plate of the control panel. ( User must AIR circulation)
Mounting Holes4mm x 4 @ 150 H x 90 W mm / 5.5mm x 4 @ 120 H x 168 W mm
ModelAs specified in the above table
Heater LoadThree phase 3 or 4 wire star or 3 wire close delta.
Control ActionZero cross over firing
Control Signal12 to 24VDC logic pulse or contact from external PID/DDC controller.

Model Wise Descriptions
Model Product Description

SIZE (H x W x D) mmSSR-3-ZC-2L-25
SSR-3S-ZC-3L-25Three Phase Thyristor based 2 leg or 3 leg solid state relay module - suitable for 3 phase heaters connected in 3 wire Star or Delta configuration (3 to 15KW @ 415/440VAC) - Natural Air Cooled.165 x 170 x 145SSR-3-ZC-2L-50
SSR-3S-ZC-3L-50Three Phase Thyristor based 2 leg or 3 leg solid state relay module - suitable for 3 phase heaters connected in 3 wire Star or Delta configuration (16 to 30KW @ 415/440VAC) - Natural Air Cooled.165 x 170 x 145SSR-3-ZC-2L-100
SSR-3S-ZC-3L-100Three Phase Thyristor based 2 leg or 3 leg solid state relay module - suitable for 3 phase heaters connected in 3 wire Star or Delta configuration (31 to 60KW @ 415/440VAC) - Force Air Cooled (through FAN).230 x 190 x 170
Features
Uses High PIV Semikron make SCR modules (SKKT series)
3 phase load / 2 leg star/delta or 3 leg star control.
Accepts DC pulse (12-24) VDC as the control signal from external controller.
Simple and Modular design for easy servicing of cards and thyristors.
Suitable for resistive heating loads.
Finds application in 3 phase Air heaters in Ovens/Furnace/AHU / DHU/ HVAC etc
Compatible with DDC/PID/PLC of any brand.

Description of Thyristor based 3 phase Solid State Relay (SSR)
Libratherm offers ready to use 3 phase Zero Cross over thyristor based solid state relay module model SSR-3-ZC-2L and SSR-3S-ZC-3L for electrical heating loads ranging from 3KW to 60KW @ 415/440VAC. This SSR module comprises of Libratherm make triggering card, which generates the zero cross over firing pulses to control suitably rated back to back connected SCRs, which is duly mounted on the heat sink with input terminal for control signal and heavy duty bus bars for heaters and incomer AC power supply. The entire assembly is mounted in MS powder coated enclosure, 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.

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Additional Information:

  • Item Code: SSR-3-ZC-2L_SSR-3S-ZC-3L
  • Pay Mode Terms: T/T (Bank Transfer)
  • Port of Dispatch: Mumbai
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Hot Runner Temperature Control Systems

Hot Runner Temperature Control Systems
  • Hot Runner Temperature Control Systems
  • Hot Runner Temperature Control Systems
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Approx. Price: Rs 1 Lakh / UnitGet Latest Price

Product Details:

Minimum Order Quantity1 Unit
BrandLibratherm
Output4-20mA
Panel1 to 16
TypeDigital

Libratherm offers 2 to 16 zone control panel for Hot Runner Temperature Control Systems, widely used in plastic injection molding. 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 multi-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.
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Thyristor Based Heater Power Regulator

Thyristor Based Heater Power Regulator
  • Thyristor Based Heater Power Regulator
  • Thyristor Based Heater Power Regulator
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Approx. Price: Rs 5,000 / UnitGet Latest Price

Product Details:

Minimum Order Quantity1 Unit
Control ActionPhase angle control (self synchronized)
Available ratings1KW Single phase to 360KW Three phase
Output0 to 230 VAC or 0 to 415 VAC

Our range of single, two and three-phase Heater Power Controller are suitable for triggering pulses to fire back-to-back connected SCRs.
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Additional Information:

  • Pay Mode Terms: T/T (Bank Transfer)
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Kamlesh Panchal (Managing Director)
No. 401-403, Diamond Industrial Estate, Ketki Pada Road
Dahisar East, Mumbai- 400068, Maharashtra, India



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