Delta Electronics AC Motor Drive VFD-VE Series - Manual (Page 224)

Chapter 5 Troubleshooting|
Revision August 2008, 03VE, SW V2.04 5-9
5.13 Electromagnetic/Induction Noise
There are many noises surround the AC motor drives and invade it by radiation or power circuit. It
may cause the misoperation of control circuit and even damage the AC motor drive. Of course, that
is a solution to increase the noise tolerance of AC motor drive. But it is not the best one due to the
limit. Therefore, solve it from the outside as following will be the best.
1. Add surge killer on the relay or contact to suppress switching surge between ON/OFF.
2. Shorten the wiring length of the control circuit or serial circuit and separate from the main
circuit wiring.
3. Comply with the wiring regulation for those shielded wire and use isolation amplifier for
long wire.
4. The grounding terminal should comply with the local regulation and ground independently,
i.e. not to have common ground with electric welding machine and power equipment.
5. Connect a noise filter at the input terminal of the AC motor drive to prevent noise from
power circuit.
In a word, three-level solutions for electromagnetic noise are “no product”, “no spread” and
“no receive”.
5.14 Environmental Condition
Since AC motor drive is an electronic device, you should comply with the environmental condition
stated in the appendix A. Following are the remedial measures for necessary.
1. To prevent vibration, anti-vibration spacer is the last choice. The vibration tolerance must
be within the specification. The vibration effect is equal to the mechanical stress and it
cannot occur frequently, continuously or repeatedly to prevent damaging AC motor drive.
2. Store in a clean and dry location free from corrosive fumes/dust to prevent rustiness, poor
contact. It also may cause short by low insulation in a humid location. The solution is to
use both paint and dust-proof. For particular occasion, use the enclosure with whole-seal
structure.
3. The surrounding temperature should be within the specification. Too high or low
temperature will affect the lifetime and reliability. For semiconductor components, damage
will occur once any specification is out of range. Therefore, it is necessary to clean and
periodical check for the air cleaner and cooling fan besides having cooler and sunshade.
In additional, the microcomputer may not work in extreme low temperature and needs to
have heater.