Goodrive270 series VFD for fan and pump Installation guidelines
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3. Protecting the motor against thermal overload
The motor must be protected against thermal overload. Once overload is detected, current must be
cut off. The VFD is equipped with the motor thermal overload protection function, which can block
output and cut off the current (if necessary) to protect the motor.
4. Bypass connection
In some critical scenarios, the power/variable frequency conversion circuit needs to be configured to
ensure proper operation of the system when a fault occurs to the VFD.
In some special scenarios, such as in soft startup, power-frequency running is directly performed after
the startup, which requires bypass connection.
 Do not connect any power source to the VFD output terminals U, V, and W.
The voltage applied to the motor cable may cause permanent damage to the
VFD.
If frequent switchover is needed, you can use the switch which carries mechanical interlock or a
contactor to ensure motor terminals are not connected to input power cables and VFD output ends
simultaneously.
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