Using Abypass Connection - Eaton PowerXL DA1 Series Installation Manual

2.3.6 Using abypass connection

WARNING

Never connect the DA1 variable frequency drive's output
terminals U, V, and W to the feed-in system (L1, L2, L3)!
Connecting the mains voltage to the output terminals can result
in the variable frequency drive being irreparably damaged.
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.
L1 L2 L3
Q1 F1
I > I > I >
①
Q11
T1
U V W
S1
②
F2
M
M1
3∼
Figure 32: Bypass motor control (example)
DA1 Variable Frequency Drives 08/18 MN04020005Z-EN www.eaton.com
②
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
2 Engineering
2.3 Safety and switching
55