Yaskawa VCD 723 - Manual (Page 25)

2 Installation and Start-up
19 Electrical Connection
9/15/93
All basic connections are shown in Figure 3 and the drive’s external connection
locations are shown in Figure 4. Most of the control I/O are shown in a general
fashion for an example of proper wiring. Because of the flexibility of the VCD
723, many of the control functions (i.e., RUN, Speed Reference, etc.) are not
permanently assigned to a specific I/O point. The function that many of the I/O
points serve is dependent upon the designer. See schematic and interconnection
diagrams for specific connections.
It is very important that voltage isolation be maintained with all the I/O points
which are not already isolated. For example, the analog outputs are not isolated.
Therefore, if an analog output is driving a meter movement, then the movement
must be in reference to the VCD 723 I/O common and not to any other common
(i.e., earth common). On the other hand, if the analog output is connected to a
non-isolated analog input of some test equipment, then analog isolation is
necessary. The analog isolation must be performed with components not
supplied with the VCD 723.
Electrical
Connection