Voltage fluctuation causes dimensional drift in CNC machines, drive faults and premature wear of electronics. A servo regulator detects the deviation at the load input and brings the output back to the nominal value.
At ONS Enerji we manufacture servo regulators in single-phase (1P/1P) and three-phase (3P/3P) designs, sized to your project’s kVA and voltage requirements rather than fixed catalogue ratings.
How does it work?
A microprocessor control board continuously measures the output voltage. When it deviates from the set point, the board drives a servo motor that moves the brush arm of a variac along its winding, changing the transformer’s boost voltage.
Because correction moves continuously along the winding, output voltage is stepless rather than stepped, which precision loads value most. The trade-off is correction speed, limited by motor rotation; for very fast, sudden fluctuations a static regulator is the better fit.
Key features
Applications
- CNC machines and machining centres
- Textile, plastic injection and packaging lines
- Laboratory and measurement equipment
- Medical imaging and clinical devices
- General supply lines of factories, workshops and facilities
- Facilities in regions with weak grids
Technical selection parameters
| Parameter | Options / typical range |
|---|---|
| Phase configuration | Single-phase (1P/1P) or three-phase (3P/3P) |
| Power | Sized per project in kVA |
| Input voltage window | Usually designed between ±15% and ±30% of nominal |
| Output accuracy | Typically ±1% to ±3% with servo technology |
| Correction type | Stepless (continuous) |
| Correction speed | Limited by servo motor speed (V/s); slower than static |
| Protection functions | Over/under-voltage, overload; additional protection and bypass on request |
| Cooling | Natural or fan-assisted (depending on power and environment) |
This table shows general characteristics of the technology and the parameters defined at order. Exact values are confirmed per project and in the datasheet.
How to choose the right unit
- Determine total connected load including motor starting currents; leave roughly 20–25% headroom.
- Record the lowest and highest voltage measured on your grid and choose the input window accordingly.
- If your load changes abruptly, consider a static or combined solution instead of servo.
- Confirm single- or three-phase and neutral requirements.
Frequently Asked Questions
01What is the difference between a servo and a static voltage regulator?
A servo regulator corrects voltage steplessly and precisely with a servo-driven variac, but more slowly. A static regulator corrects in steps using electronic switches, very fast and with no moving parts. Choose servo for accuracy, static for speed.
02How do I choose the kVA rating of a servo regulator?
Add up the power of all connected equipment including motor starting current, convert watts to VA using the power factor, and add roughly 20–25% headroom. Our kVA calculator gives a quick first estimate.
03Can a servo regulator replace a UPS?
No. A servo regulator only corrects voltage deviations; it does not supply power during an outage. If outages are also a risk, it can be used together with a UPS.
04Do you manufacture servo regulators in custom kVA or voltage ratings?
Yes. We build to your load data, with custom kVA, input window and output voltage. Simply share your details through the quote form.