What to identify
A motor must match the compressor in power, speed, frame, mounting, voltage, frequency, insulation and protection. A drive must match the motor and the controller and be set up correctly.
What we need
Please send:
- Photographs of the motor and drive nameplates
- Compressor make, model and serial number
- Supply voltage, frequency and phase
- Symptoms and any fault codes shown
Check the cause
A motor or drive failure often has a cause such as overheating, supply problems, contamination or a mechanical fault. Replacing the part without finding the cause risks a repeat failure.
Safety and competence
Electrical work should be done by competent people following the applicable codes and the manufacturer's instructions. We state clearly what we supply and what the installation requires.
Before you order
Confirm that the electrical rating, frame, mounting and protection match, and that the controller and drive settings are compatible.
Ask for the supply status of the item: whether it is genuine, OEM-approved or an alternative, and whether it is in stock or must be sourced.
Check the lead-time basis and the warranty terms that apply.
Frequently asked questions
Can I replace a motor with a different brand?
Possibly, if the electrical and mechanical details match and the machine allows it. We check the fit before recommending it.
What if the VFD shows a fault code?
Send the code and a photograph of the display. Many codes point to a specific cause, which we help you investigate.
Do I need to re-programme a new drive?
Often yes. The drive settings must match the motor and the machine, so setup is part of the job.
Field guide
Motors and VFD parts: find the fault before buying the part
An electrical fault often looks like a motor or drive failure when the cause lies elsewhere: a loose terminal, a failed contactor, low supply voltage, a blocked cooling path or a compressor that is overloading the motor. Measure first, then replace.
Common symptoms
| Symptom | Check first |
|---|---|
| Overload or thermal trip | Supply voltage and balance, motor current against nameplate, discharge pressure setting, cooling air flow, airend condition |
| Motor hums but will not start | Missing phase, contactor contacts, star-delta timer and wiring, seized airend |
| Bearing noise from the motor | Greasing interval and quantity, alignment, belt tension |
| VFD fault code | Record the code and the conditions; check supply, cooling fans, filters and cable connections before replacing the drive |
| Burnt smell or discoloured terminals | Loose connections and undersized cables; isolate and inspect immediately |
Replacing a motor
A replacement motor must match power, speed, frame size, shaft dimensions, mounting, enclosure rating and efficiency class. On variable-speed compressors it must also be suitable for inverter duty. Record all nameplate data from the old motor, including the frame designation, before ordering.
VFD components
Drives contain cooling fans, filters, capacitors and control boards that age with heat and dust. Clean filters and working fans are the cheapest way to extend drive life. Where a drive must be replaced, the new unit needs the correct rating, parameter settings and any compressor-specific configuration from the original.
Electrical work on compressors must be done by qualified people with the machine isolated and locked off.
What to send for a quotation
- Compressor make, model and serial number.
- Motor nameplate photo (power, voltage, speed, frame).
- VFD model and the fault code shown.
- Supply voltage readings if available.
Send it through find my part or the spare parts enquiry, or call +91 99590 60718 or +91 92468 88812.