The cables used in the variable frequency drives must coordinate with the operating environment and other parts of the system.
That’s why one should get the right VFD cable to ensure the reliability and lifecycle of the drive.
Before you decide to buy the VFD cable, it is necessary to know about the voltage and ampacity of both the motor and the cable.
A cable should have enough voltage to support a motor’s working. The rating of a cable should be higher than that of the VFD.
Voltage rate is a key character to specify the VFD cables because VFD cables are available in low and medium voltages.
A high performance VFD cable is best for the high frequency designs because they contain high-flex type and high strand counts.
It is very important to see that you do not use stationary cables for torsion applications and continuous flex.
The physical characteristics of a cable mainly depend upon its environment of application. They are deeply affected by the environmental impacts like abrasion, sunlight, temperature and chemicals.
If you know the load size, then it can be very critical in grabbing the right sized conductor.
Any undersized conductor can damage the insulation material due to increased conductor heating leading to the premature cable failure.
Similarly, an over-sized conductor adds to the cost of the cable and increases the cable OD.
- Construction of the cable
Obviously, the construction of the wire is the most important feature that needs to be noticed before buying a VFD cable.
The insulation and jacketing of the cable are very necessary. The construction of the cable is also linked with the environment and application.
If there are oils or chemicals in the environment then the cable with proper jacketing can withstand.
You should pay special attention to the insulation of the cable.
The cables that have heavy wall of thermoset insulation offer better performance, thermal stability and electrical benefits.
Figure 10 – VFD Cable Selection