Inductive Load

INDUCTIVE LOAD – SELECT YOUR LOAD CONNECTION:

PURE RESISTIVE LOAD ON SECONDARY:
Pure Resistive Elements on the Secondary of 1PH Transformer

Pure Resistive Elements Secondary 1PH Transformer

Select

Pure Resistive Load on Secondary of 3PH Transformer

Pure Resistive Load Secondary 3PH Transformer

Select

 

COLD RESISTANCE LOAD ON SECONDARY:
MoSi2 Element 1PH Load

MoSi2 Element 1PH Load

Select

MoSi2 Element Delta Star No Neutral, Star with Neutral, With or Without 3PH Transformer

Delta/Star No Neutral,Star Neutral, With W/out 3PH Transf.

Select

LOAD ON SECONDARY OF TRASFORMER

Transformer have an inrush current on start up. For this kind of application is required special SCR Power Controller.
Up to 700A 1PH loads we suggest you REVO CL. Over this current we recommend the Multidrive family up to a current of 2700A.
REVO E and Multidrive is used for three phase transformer. Close examination of the transformer application needs to be made a the typical inrush current, when switched on. This over-current will have the result to damage Fuses or Thyristor.

To avoid the peak current we suggest you to use the following techniques:

1) Phase angle firing with soft start and current limit. This type of firing can be used with all types of loads.

  • Normal resistance.
  • Cold resistance (Example: Kanthall Super elements)
  • Transformer coupled with normal or cold resistance.
  • With cold resistance use I feed-back.

2) Burst firing using the Delay Triggering (DT) technique. To avoid magnetic circuit saturation, the thyristor unit will switch OFF when the load voltage is negative and switch ON again when positive. The unit also has an adjustable delay on voltage zero crossing. In this way it is possible to switch ON when current is zero. This Firing technique can only be used with normal resistance, where its resistive value remains constant with temperature variations.

Documentation
CD AppNotes Eng Application Notes - Transformers
CD AppNotes Eng Application Notes - Transformers
CD_AppNotes_eng_Application Notes_-_Transformers.pdf
0.4 MiB
1847 Downloads
Details
CD AppNotes Eng Application Notes - Rev2
CD AppNotes Eng Application Notes - Rev2
CD_AppNotes_eng_Application Notes_-_Rev2.pdf
0.6 MiB
1575 Downloads
Details

Navigate inside the other application note:

REVO C 1PH – Revo Connect Universal SCR Power Controller Single Phase

Schema di collegamento del REVO C monofase

  • Phases: 1
  • Current Range form 30 to 800A.
  • Voltage Range 480V , 600V and 690V .
  • Inputs: 4:20mA , 0:10V, SSR and ModBus as std and different Field Bus Listed in the Product Coding
  • Firing mode: Half Cycle,Single Cycle,Burst Firing,Delayed Triggering, Phase Angle with or without Soft Start
  • Control Mode: Voltage,Current and Power or V2 and I2 with additional Transfer to VxI
  • USB: port integrated for configuration in safety mode (No Load and Auxiliary Voltage needed) Unit Powered Through USB
  • 100 KA: Short Circuit Current rating (SCCR) up to 600V
  • cUL and CE + EMC approved

REVO C 2PH – Revo Connect Universal SCR Power Controller Two Phases

Schema di collegamento del REVO C bifase

  • Phases: 2
  • Current Range from 30 to 800A.
  • Range di tensione 480V , 600V & 690V.
  • Inputs: 4:20mA , 0:10V, SSR and ModBus as std and different Field Bus Listed in the Product Coding
  • Load type: Normal Resistance,Infrared Short,Medium and Long,Transformar Primary using Delayed Triggering
  • Inputs: 4:20mA , 0:10V, SSR and ModBus as std and different Field Bus Listed in the Product Coding
  • Firing mode: Burst Firing , Zero Crossing.
  • USB: port integrated for configuration in safety mode (No Load and Auxiliary Voltage needed) Unit Powered Through USB
  • 100 KA: Short Circuit Current rating (SCCR) up to 600V
  • cUL and CE + EMC approved

REVO C 3PH – Revo Connect Universal SCR Power Controller Three Phases

Schema di collegamento del REVO C trifase

  • Phases: 3
  • Current Range form 30 to 800A.
  • Voltage Range 480V , 600V and 690V.
  • Inputs: 4:20mA , 0:10V, SSR and ModBus as std and different Field Bus Listed in the Product Coding
  • Firing mode:Burst Firing , Delayed Triggering and Phase Angle with or without Soft Start
  • Control Mode: Voltage,Current and Power or V2 and I2 with additional Transfer to VxI
  • USB: port integrated for configuration in safety mode (No Load and Auxiliary Voltage needed) Unit Powered Through USB
  • 100 KA: Short Circuit Current rating (SCCR) up to 600V
  • cUL and CE + EMC approved

Pure Resistive Load on Secondary of 3ph Transformer


Thyristor Power Controller designed to Drive Three Phase Transformers Coupled on Secondary With Pure Resistive Loads.

Pure Resistive Elements on the Secondary of 1PH Transformer


Select the SCR ( thyristor ) controller for Pure Resistive Elements on the Secondary of 1PH Transformer.

Transformer have inrush current on start up for this reason special SCR Power Controller are required. For 1ph load REVO CL up to 700A is normally used. Over this current we recommend the Multidrive family up to a current of 2700A. Multidrive and REVO E is used for three phase transformer.

MoSi2 Element 1PH Load


This kind of heaters, MoSi2 Element ( Kanthal Super Elements TM* ), increase resistivity sharply with temperature. The value of the resistance at ambient temperature is very low and increase its value up to 10 times as a function of temperature. To don’t oversize in current the Thyristor unit it’s necessary to limit the current to the load reducing the voltage with phase angle firing and current limit. When the resistance value reach a setted value are possible two types of working method that can be selected from HMI:- Phase Angle plus current limit all the time long Or- Phase Angle plus current limit when the resistance is cold and transfering to Delayed Triggering if load is coupled with transformer. CD Automation can drive this kind of elements with REVO CL and Multidrive 1ph Units.

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