CED and electroplating rectifiers
Low-ripple DC with current control tight enough that deposit thickness repeats across a shift — 50 A to 1000 A at 100 to 300 V, air or oil cooled.
- DC output current
- 50 A – 1000 A
- DC output voltage
- 100 / 150 / 200 / 250 / 300 V
- Regulation
- ±1% CC and CV
- Ripple
- < 5% standard · < 2% filtered option
More views of the CED & Plating Rectifier
Detail 
Terminations 
Installed on site
By rating and configuration
Each of these is a distinct build, not a filter on one page.
And when it’s the right answer
In cathodic electrodeposition and in plating generally, the deposit thickness is a direct function of current × time. If the current wanders, the coating varies, and you find out at the salt-spray test rather than on the line. A plating rectifier is therefore first a current regulator and only incidentally a power supply.
Ripple matters as much as regulation. High ripple produces a grainy, poorly-adherent deposit and wastes chemistry. Our units hold ripple under 5% and, with the filtered option, under 2%.
CED lines additionally need a ramp: voltage rises on a defined profile as the body enters the tank, to avoid gassing and to control film build. Our CED units store multiple ramp recipes and switch between them from the panel or from the line PLC.
A bench supply regulates voltage. Plating needs constant current across a changing bath resistance, plus ramp control and ampere-hour totalising for chemistry dosing.
A plain transformer and bridge gives you DC, but the current wanders with bath resistance and mains voltage. Closed-loop thyristor control holds the setpoint, which is what makes the deposit repeatable.
Where these get installed
- CED / e-coat paint lines
- Zinc, nickel, chrome and copper plating
- Anodising lines
- Electropolishing
- Electrowinning and refining
- Phosphating and passivation
Full specification
Typical values for the standard build. Every unit is configured to order — the figures on your general arrangement drawing are the ones that apply.
| DC output current | 50 A – 1000 A |
|---|---|
| DC output voltage | 100 / 150 / 200 / 250 / 300 V |
| Regulation | ±1% CC and CV |
| Ripple | < 5% standard · < 2% filtered option |
| Control | Thyristor phase-angle, closed loop |
| Modes | Constant current · constant voltage · ramp profile |
| Ramp | Programmable, multiple stored recipes (CED) |
| Totalising | Ampere-hour counter for chemistry dosing |
| Polarity reversal | Optional, timed (periodic reverse plating) |
| Cooling | Forced air or oil cooled |
| Interface | HMI, RS-485 Modbus, 4–20 mA, PLC-ready |
| Protection | Over-current, over-temp, phase loss, earth leakage |
Sectors that buy this
Electroplating & Surface Finishing
Deposit thickness is current × time. If the current wanders, the coating varies — and you find out at the salt-spray test, not on the line.
CNC & Machine Shops
A CNC controller that resets mid-cycle scraps the job and can crash the tool. On MIDC feeders that is a voltage problem far more often than an outage problem.
CED & Plating Rectifier — questions we get asked
Anything not covered here, call us — most of it is faster to answer on the phone.
What ripple is acceptable for a plating rectifier?
Under 5% is fine for most decorative and functional plating. Under 2% is worth specifying for bright nickel, chrome and any application where deposit grain structure is critical. Above roughly 10% you will see it in the finish.
Air cooled or oil cooled?
Air cooled is simpler and cheaper to maintain. In a plating shop where the atmosphere is corrosive and airborne chemistry attacks the heatsinks and windings, oil cooled lasts significantly longer. The shop environment usually decides this rather than the current rating.
Can the rectifier be controlled from our line PLC?
Yes. Standard interfaces are RS-485 Modbus RTU and 4–20 mA analogue setpoint with run/stop and fault contacts. Ethernet/IP and Profibus are available to order — tell us the PLC make at the enquiry stage.
Do you supply the busbar and tank connections?
We supply the rectifier with output terminals sized for the rating. Busbar runs to the tank are usually done locally because the layout differs per shop, but we will produce the busbar sizing calculation and a layout drawing with the order.
Where we supply and attend
CED & Plating Rectifier units are built at our Pune works and delivered, installed and commissioned across the city and the industrial belt around it.
Outside these areas we contract individually against distance, and we will tell you honestly if the response time you need is not one we can hold to. All areas served
After it’s installed
We service what we build, and what everyone else builds too.