Rockwell Automation 150 SMC-Flex User Manual - Manual (Page 83)

Wiring 3-39
SMC-Flex Controller as a Bypass to
an AC Drive By using the controller as shown in Figure 3.37, a soft start
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 3.37 Typical Application Diagram of a Bypass Contactor for an AC
Drive
M
3-Phase
Input Power
VFD Branch
Protection
VFD
L1/1
L3/5
L2/3
T1/2
T3/6
T2/4
SMC-Flex
Controller
AF AF
IC IC
O.L.
➀ ➀
➁ ➁ ➁
➁
➃
➁ ➁
➂
➀ Mechanical interlock required
➁ Customer supplied
➂ Many VF drives are rated 150% FLA. Because the SMC-Flex controller can be used for 600% FLA starting,
separate branch circuit protection may be required.
➃ Overload protection is included as a standard feature of the SMC-Flex controller.