Eaton PowerXL DA1 - Using a Bypass Connection

2 Engineering
2.3 Safety and switching
46 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
2.3.6 Using a bypass connection
If a bypass is required, use mechanically linked switches or contactors or
electrically interlocked contactors in order to ensure that the motor terminals
will not be simultaneously connected to the mains connection and to the
variable frequency drive’s output terminals.
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WARNING
Never connect the DA1 variable frequency drive’s output
terminals U, V, and W to the power feed system (L1, L2, L3)!
Connecting the mains voltage to the output terminals can result
in the variable frequency drive being irreparably damaged.
a Q1 thermal overload and short-circuit protection
b F1 fuse and F2 overload relay (alternative to ①)
Q1 Mains contactor
T1 DA1 variable frequency drive
S1 Interlocked switching between variable frequency drive
and bypass
F2 Motor protection (overload relay, alternative to ①)
M1 Three-phase motor
Figure 26:Bypass motor control (example)
Q1 F1
I
>
I
>
I
>
Q11
S1
M1
F2
T1
M
3∼
L1
L2
L3
UVW
①
②
②