INVT Goodrive350-19 Series Operation Manual page 510

Goodrive350-19 Series VFD for Crane Optional peripheral accessories
Shield layer
Insulating layer
Cross-section of the cable
Figure D-22 Cable cross section
D.5.2 Control cable
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 single-shielded twisted-pair cables
Power cable arrangement
Figure D-23 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.
Dielectric withstand tests have been performed between the main circuit and housing of each VFD
before delivery. In addition, the VFD has the internal voltage limiting circuit, which can automatically
cut off the test voltage. Do not perform any voltage withstand 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.
Note: Check the insulation conditions of the input power cable of a VFD according to the local
regulations before connecting it.
-498-