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
-Phas
In
ut Powe
VFD Br
n
h
Prot
tio
L1
L
L2
T1
T
T2
M
-Flex
ontrolle
I
I
.L
➀➀
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 startin
,
separate branch circuit protection may be required.
➃ Overload protection is included as a standard feature of the SMC-Flex controller.
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