RECTIFIERS FOR PLATING AND ANODIZING
AVAILABLE:
  • PROCESS COMPUTER
  • TREATMENT PARAMETERS
    PRINTING DEVICE
    (for quality control)
 

main unit
Main Unit

 

PLATING (Zinc, Nichel, Chromium, Hardchromium)

Four types of ELCA rectifiers are available for plating 

TYPE PRP TYPE PRPR
TYPE N

Conventional rectifier

TYPE NR

Conventional rectifier with reversing polarity

 

TIPO PRP TIPO PRPR
TYPE PRP

Pulse rectifier with periodic reversing polarity

TYPE PRPR

Pulse rectifier with periodic and continuous reversing polarity

 

TECHNICAL FEATURES  

Control:
By means of SCR set on: primary or secondary side (if reverse polarity is requested) 

Rectifier circuit:
Six-phase provided with interphase transformer, or three-phase bridge. 

Main transformer: according to IEC 742 standard "Safety isolating transformers" 

General switch:
Magnetothermic or magnetic (automatic) type. 

Cooling:
Air cooling: by means of ventilator and air filters (max ambient temperature: 45°C). Protection IP20

On request: closed loop air cooling by means of air/water exchanger (IP54). 

Protections:
- Max current: by means of electronic device and automatic general switch
- Max temperature: by means of thermostats inside the main transformer windings and on the diode cases. 

Voltage/current control:
Constant current and (or) constant voltage control
Accuracy: ±1% against ±10% network variation and load variation from 10% to 100% 

For pulse rectifiers:
In ELCA pulse rectifiers the pulse current value can reach 1.5 times the base value. Moreover if pulse rectifier works without any pulses the continuous working current is 1.35 times the base current.

 

RECTIFIERS TYPE N - NR
 
"Constant current" and "constant voltage" control (choice by means of a switch) 

RIPPLE 

It is well known that the lower the working actual voltage in comparison with the rated voltage of the rectifier the higher the ripple value (alternate voltage superimposed on the average direct one). If you foresee a widely changeable working voltage and if a low ripple value is requested it is advisable to equip the unit with an inductance-capacitor (L-C) smoothing filter (see optional list).
By means of it the ripple value is lower than 5% if the output voltage is between 30% and 100% of the rated value and at any current value.
We remind you that the rectifiers can't be equipped with the smoothing filter after their construction and delivery. 

RECTIFIERS TYPE PRP
 
They have the following particular features:
- Positive pulses can be superimposed on the base level (adjustable between 0-50% of the base level).
- Longer period (some seconds) of direct current are followed by very short (some milliseconds) polarity reversals. 

Thanks to the positive pulses superimposed on the base level the deposition rate and the throwing power are increased.
Thanks to the periodic reversing polarity, the uniformity is increased and, as regards hard-chromium, a crack-free deposit can be obtained 

RECTIFIERS TYPE PRPR
 
By means of them also continuous reversing polarity (f.i. for etching) can be obtained. 

OPTIONALS FOR ELCA RECTIFIERS

  • PROCESS COMPUTER ELCA RAMPER
  • FILTER for low ripple (hard chromium)
  • THICKNESS PRESETTER (anodizing)
  • Interfacing with PLC (4-20 mA)