Kruger Ecowatt K320 Series Operation Manual page 356

Ecowatt Drive K320 series Optional peripheral accessories
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Shield layer
Insulating layer
Cross-section of the cable
D.4.2 Control cables
All analog control cables and cables used for frequency input must be shielded cables. Analog
signal cables need to be double-shielded twisted-pair cables (as shown in figure a). Use one
separate shielded twisted pair for each signal. Do not use the same ground wire for different
analog signals.
Multiple double-shielded twisted-pair cables Multiple shielded twisted-pair cables
Power cable arrangement
For low-voltage digital signals, double-shielded cables are recommended, but shielded or
unshielded twisted pairs (as shown in figure b) also can be used. For frequency signals,
however, only shielded cables can be used.
Relay cables need to be those with metal braided shield layers.
Keypads need to be connected by using network cables. In complicated electromagnetic
environments, shielded network cables are recommended.
Note: Analog signals and digital signals cannot use the same cables, and their cables must be
arranged separately.
Do not perform any voltage endurance or insulation resistance tests, such as high-voltage
insulation tests or using a megohmmeter to measure the insulation resistance, on the VFD or
its components. Insulation and voltage endurance tests have been performed between the
main circuit and chassis of each VFD before delivery. In addition, voltage limiting circuits that
can automatically cut off the test voltage are configured inside the VFDs.
Note: Check the insulation conditions of the input power cable of a VFD according to the local
regulations before connecting it.
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