SYStronics AC-3301L, User Manual, Page: 18 / 21

AC-3301L MANUAL
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Electronic control equipment has different operating characteristics from electromechanical equipment. Safety
instructions for the application, installation and maintenance of the electronic control unit, important differences
between the electrical and electronic control unit and the electric machine, and contents of the use for the
electric control unit. Due to these differences and the various uses of electronic equipment, the person
responsible for the application of this equipment must use and install this equipment only within the permitted
scope of application.
Overview of electrical noise control
Electrical noise can be caused by normal operation of components or components of the system due to
voltage spikes. The conduction mechanism may interfere with the operation of parts or elements of other
systems (noise interference), resulting in malfunction.
Generate noise source
1. Mechanically switched inductive loads generate strong noise intermittently. (MC, MCCB, etc.)
2. PWM drive power output generates severe continuous noise.
3. Switch mode DC power supply (SMPS) may continue to generate noise.
4. Noise source may occur due to contact switching.
Among the causes of the above noise sources, the noise that the system manufacturer can reduce is only
the contact switching noise.
Conduction noise
Electrical noise interferes with the normal operation of the equipment. In the case of electrical noise
conduction, noise may be directly conducted by the system power wiring, and may be emitted to the outside
through the wiring of the industrial control device (inverter).
ACㆍDC power cable installation
For AC·DC power installation, it is recommended to use junction, isolation, shielding and filter for power
supply and related wiring.
Motor power cable installation
If possible, do not extend the motor power cable. In principle, the cable between the drive and the motor can
not be used in extended connection. The universal reason for changing (extending) cables in the middle is
for applications that require flexible cables. Observe the following guidelines when handling the remaining
cables.
1. Do not detect different types of cables together. A transformer which is valid in HF is formed.
2. Cable length should be cut to fit the application.
3. If you can not cut the remaining cable, please arrange it in '8' or 'S' form. Never roll it round.
Precautions
Good example Good example Incorrect example