Never connect the supply power
n some special situations, for example, if it is only used in soft start, can be
normal work if faults occur in some
connected to multiple motors, a separate thermal
dimensioned according to the rated current
Installation Guidelines
27
. No additional protection devices are needed.
If the
overload
switch or a circuit breaker must be used for protecting each cable and
motor. These devices may require a separate fuse to cut off the
short-circuit current.
4.4.3 Protecting the motor against thermal overload
According to regulations, the motor must be protected against thermal overload and the current
must be switched off when overload is detected. The
includes a motor thermal protection
function that protects the motor and closes the output to switch off the current when necessary.
4.4.4 Implementing a bypass connection
It is necessary to set power frequency and variable frequency conversion circuits for the assurance
of continuous
significant
situations.
I
converted
into
power frequency running after starting and some corresponding bypass should be added.
output terminals U, V and W.
Power line voltage applied to the output can result in permanent damage .
If frequent shifting is required, employ mechanically connected switches or contactors to ensure
that the motor terminals are not connected to the AC power line and
output terminals
simultaneously.
