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  Features
   
 
Designed for tropical conditions
Designed for 500C ambient temperature.
Special surface treatment*.
Process controller’ for referencing, interlocking and protection - thus avoiding several electrical moving contacts which are prone to malfunctioning in dusty environments.
   
  Conceived for process stability
Speed holding accuracy of 0.5%.
Bumpless transfer from SPRS to rotor resistance control in case of fault.
Changeover to voltage feedback in case of tacho-generator failure.
   
  Environment - friendly configuration
Typically for ratings above 1000kW, SPRS is equipped with a 12-pulse configuration to eliminate 5th & 7th harmonics - thus ensuring good quality power, without polluting the grid.
     
  Safety to induction motor
DC reactor to reduce stress on motor winding.
Software-based rotor current asymmetry detection.
Fail-safe changeover from rotor resistance control to SPRS to avoid a rotor open circuit.
   
  Safety to mechanical system
Closed-loop speed control to reduce vibrations.
Resonance speed skip facility to avoid excessive vibrations and damage.
   
  Supply voltage fluctuations
Control system designed to withstand upto 20% voltage dip.
Fast undervoltage detection circuit to take corrective action.
DC resistance plus bypass system* to protect SPRS in case of severe undervoltage.
   
  Applications    
       
Iron and Steel    
  Sponge iron plants , Blast furnaces/arc furnaces, Continuous casting plants, Wire rod mills, Annealing furnaces, Cold rolling mills, Cold rolling mills, Process and finishing lines...
Cement    
  Plant-wide drives, control and instrumentation from crusher to packing. SPRS for ID, FD fans, classifier fans . . . .
Paper    
  Sectional paper machines, Super calenders, Slitters, Rewinders . . .
Material Handling    
  Port-based long conveyor, Stacker reclaimers, Bagging plants . . . .
Chemical    
  LPG/gas sweetening, Distillation column control, Naphtha cracker and aromatic plants, Lactum and anone plants . . . .
Power    
  Boiler interlocks, burner management, ¨ Water treatment ,Coal & ash handling . . .
       
 
  SPRS
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