ANYHZ FST-500 Series, Manual, Page: 119 / 151

FST 500 Manual
- Page 119 -
5.15 Affecting 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 at the power input terminal of the AC motor drive.
3. If phase lead capacitors are used (never on the AC motor drive output!!), use serial reactors to
prevent damage to the capacitors damage from high harmonics.

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 at low speeds for long time