Delta Electronics 115V Series manual Affecting Other Machines, Serial reactor Phase lead capacitor

Chapter 7 Troubleshooting VFD-S Series

4.Store within a relative humidity range of 0% to 90% and non-condensing environment. Use an air conditioner and/or exsiccator.

7.15Affecting Other Machines

An AC motor drive may affect the operation of other machines due to many reasons. Some solutions are:

High Harmonics at Power Side

High harmonics at power side during running can be improved by:

1.Separate the power system: use a transformer for AC motor drive.

2.Use a reactor or rectifier at the power input terminal of the AC motor drive or decrease high harmonic by multiple circuit.

3.If phase lead capacitors are used (never on the AC motor drive output!!), use serial reactors to prevent capacitors damage from high harmonics.

serial reactor

phase lead capacitor

Motor Temperature Rises

When the motor is a standard induction motor with fan, the cooling will be bad at low speeds, causing the motor to overheat. Besides, high harmonics at the output increases copper and core losses. The following measures should be used depending on load and operation range.

1.Use a motor with independent ventilation (forced external cooling) or increase the motor rated power.

2.Use a special inverter duty motor.

3.Do NOT run in the low speed range.

7-10 Revision August 2006, SE08, SW V2.61