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Chapter 7 Troubleshooting |VFD-S Series
7-10 Revision August 2006, SE08, SW V2.61
4. Store within a relative humidity range of 0% to 90% and non-condensing environment.
Use an air conditioner and/or exsiccator.
7.15 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 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.