VFD commissioning step by step

Every manufacturer names parameters differently, but commissioning a frequency inverter follows the same sequence. Use the drive's quick-commissioning menu or wizard where available, and keep the manual open for parameter numbers.

1. Before power-up

• Drive rating matches motor current (heavy/normal duty) and supply voltage.
• Motor cable: shielded, correct length (check the limit and the need for output reactor/filter), shield terminated at both ends with 360° clamps.
• Insulation test of the motor with the drive disconnected.
• Safe Torque Off (STO) inputs wired as designed; brake resistor connected if needed.

2. Motor data

Enter nameplate data: rated voltage, current, frequency, speed, power, cos φ, connection (star/delta must match the voltage). Wrong motor data is the root cause of many overcurrent and overload trips.

3. Control mode and source

• Control method: V/f for pumps/fans and multi-motor, sensorless vector for most machines, closed loop with encoder for high torque at zero speed.
• Command source (terminals, keypad, fieldbus) and setpoint source (analog input, preset, fieldbus).

4. Limits and ramps

Minimum/maximum frequency, acceleration/deceleration times (long enough for the load inertia, or with braking), current limit, stop mode (ramp/coast), motor thermal protection.

5. Identification (auto-tuning)

Static identification is possible with the load connected; rotating identification gives better vector control results but requires the motor to be free to turn. Check direction of rotation first in jog.

6. I/O and fieldbus

Configure digital inputs (run, direction, reset), relay outputs (fault, ready, running), analog input range (0–10 V / 4–20 mA, with fault on wire break). For fieldbus: control word/status word, setpoint scaling (often 16384 or 4000h = 100 %), communication-loss reaction.

7. Test run and handover

Run unloaded, then with load across the speed range; watch current, DC-link voltage and temperatures. Back up the parameter set (keypad memory, PC tool) and attach it to the documentation.