A servo voltage stabiliser preventive maintenance schedule lists the checks and jobs done on the equipment at fixed intervals, how long each takes, and in what order of frequency, so problems are found before the servo voltage stabiliser fails. This page gives the schedule used in the PlantOps360 task library for servo voltage stabiliser (and voltage regulator), which follows common industry practice for general-purpose equipment. It is also searched for as servo stabilizer, voltage stabiliser, automatic voltage regulator, constant voltage transformer.
The maker’s manual and your site safety procedures always come first where they differ. Intervals set by law differ by state.
Servo voltage stabiliser preventive maintenance schedule and checklist
| How often | Task | Estimated time |
|---|---|---|
| Daily | Check the input and output voltage readings and the indicators; check for overload or fault alarms | 3 min |
| Weekly | Listen for humming or abnormal noise and feel for overheating; keep the ventilation clear | 10 min |
| Monthly | Check the servo motor, carbon brush or roller contact and the correction movement; clean the variac track on dry types | 20 min |
| Quarterly | Check the oil level and condition on oil-cooled units; check contactors, terminals and the cooling fan | 30 min |
| Half-yearly | Tighten power terminals and control connections; thermography under load | 45 min |
| Annual | Service: replace worn brushes or rollers, test the control card and the bypass switch, measure insulation resistance and the output accuracy | 90 min |
Servo voltage stabiliser maintenance frequency and yearly workload
At the estimated times, one servo voltage stabiliser needs about 36 hours of preventive maintenance a year. The biggest single job is “Service: replace worn brushes or rollers, test the control card and the bypass switch, measure insulation resistance and the output accuracy” at 90 minutes, done annual. Multiply by the number of units you have to see the workload for your plant.
| Frequency | Tasks | Time per round | Hours per year |
|---|---|---|---|
| Daily | 1 | 3 min | 18.3 h |
| Weekly | 1 | 10 min | 8.7 h |
| Monthly | 1 | 20 min | 4.0 h |
| Quarterly | 1 | 30 min | 2.0 h |
| Half-yearly | 1 | 45 min | 1.5 h |
| Annual | 1 | 90 min | 1.5 h |
What goes wrong on a servo voltage stabiliser without preventive maintenance
- Servo motor and carbon brush wear
- Control card faults
- Overheating from loose connections
- Dust and moisture
What to watch between services
- Output voltage accuracy
- Brush and servo condition
- Terminal temperature
Safety and statutory notes for servo voltage stabiliser maintenance
Isolate the supply and discharge before opening. Record voltage readings to see trends.
Where a servo voltage stabiliser preventive maintenance schedule is used
A servo voltage stabiliser is found in almost every industry. The industry guides below show how it fits into the wider schedule of each one:
- Preventive maintenance schedule for pharmaceutical plants
- Preventive maintenance schedule for food, dairy and beverage plants
- Preventive maintenance schedule for automotive plants
- Preventive maintenance schedule for chemical, fertiliser and petrochemical plants
- Preventive maintenance schedule for cement, glass, ceramics and building materials plants
- Preventive maintenance schedule for steel, foundry, forging and metal plants
- Preventive maintenance schedule for textile and garment mills
- Preventive maintenance schedule for thermal and hydro power plants
See all industry preventive maintenance schedules.
Related equipment maintenance schedules
- Power / distribution transformer preventive maintenance schedule
- Dry-type / cast resin transformer preventive maintenance schedule
- HT switchgear preventive maintenance schedule
- LT switchgear preventive maintenance schedule
- Motor control centre preventive maintenance schedule
- APFC panel and capacitor banks preventive maintenance schedule
- Uninterruptible power supply preventive maintenance schedule
- Battery bank preventive maintenance schedule
Browse the full list of equipment preventive maintenance schedules (317 types).
Run this servo voltage stabiliser schedule in maintenance software
In preventive maintenance software, each row above becomes a recurring task on the asset with its checklist, time estimate and parts. Tasks can be triggered by calendar date, running hours, meter readings or production cycles, each completed task is recorded with the person and date, and a failed check can open a work order. For the method behind it, read the guide to the preventive maintenance schedule, or use the free generator to get a 12-month plan for your whole equipment list.
Build my preventive maintenance schedule (free Excel)
Frequently asked questions
How often should a servo voltage stabiliser be serviced?
In our schedule a servo voltage stabiliser has 6 tasks: 1 daily, 1 weekly, 1 monthly, 1 quarterly, 1 half-yearly, 1 annual. The biggest job is “Service: replace worn brushes or rollers, test the control card and the bypass switch, measure insulation resistance and the output accuracy”, which is done annual. Always follow the maker’s manual where it gives a different interval.
What is included in servo voltage stabiliser preventive maintenance?
It covers routine checks and jobs such as “Check the input and output voltage readings and the indicators; check for overload or…”, “Listen for humming or abnormal noise and feel for overheating; keep the ventilation clear”, “Check the servo motor, carbon brush or roller contact and the correction movement; clean…”, up to the annual overhaul or inspection. The full list with times is in the table above.
How many hours of maintenance does a servo voltage stabiliser need per year?
About 36 hours per unit per year at the estimated times in our library, including the daily checks done every day. Use it to plan workload, not as a benchmark.
Is there a free servo voltage stabiliser maintenance checklist?
Yes. The table on this page is a ready checklist. The free preventive maintenance schedule generator turns it into a 12-month Excel schedule for your list of equipment, with monthly workload hours.