Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 136)

5-12 SMC Dialog Plus Controller Special Application Considerations
SMC Dialog Plus Controller
as a Bypass to an AC Drive By using the controller as shown in Figure 5.9, a soft star
characteristic can be provided in the event that an AC drive is non-
operational.
Note: A controlled acceleration can be achieved with this scheme,
but speed control is not available in the bypass mode.
Figure 5.9 Typical Application Diagram of a Bypass Contactor for an AC
Drive
!
ATTENTION: Proper care must be taken to isolate th
AC drive from line and load potential when the
controller is energized.
➀ Mechanical interlock required.
➁
➂
➃
Custom er supplied.
Many VF drives are rated 150% FLA. Because the SMC Dialog Plus controller can be
used for 600% FLA starting, separate branch circuit protection m ay be required.
Overload protection is included as a standard feature of the SMC Dialog Plus controller.
Pow er Input
VFD Branch
Protection ➂
SMC Dialog Plus Controller ➃
L1/1
L2/3
L3/5
T1/2
T2/4
T3/6
Motor
➁
VFD
3-Phase
O.L.➁
➀ ➀