Goodrive270 series VFD for fan and pump Optional peripheral accessories
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2. Use a megohmmeter of 500V DC to measure the insulation resistance between each phase
conductor and the protection grounding conductor. For details about the insulation resistance of
the motor, see the description provided by the manufacturer.
Note: The insulation resistance is reduced if it is damp inside the motor. If it may be damp, you need
to dry the motor and then measure the insulation resistance again.
D.5 Breakers and electromagnetic contactors
You need to add a fuse to prevent overload. You need to add a fuse to prevent overload.
You need to configure a manually manipulated molded case circuit breaker (MCCB) between the AC
power supply and VFD. The breaker must be locked in the open state to facilitate installation and
inspection. The capacity of the breaker needs to be 1.5 to 2 times the VFD rated input current.
 According to the working principle and structure of breakers, if the
manufacturer's regulation is not followed, hot ionized gases may escape from
the breaker enclosure when a short-circuit occurs. To ensure safe use,
exercise extra caution when installing and placing the breaker. Follow the
manufacturer's instructions.
To ensure safety, you can configure an electromagnetic contactor on the input side to control the
switch-on and switch-off of the main circuit power, so that the input power supply of the VFD can be
effectively cut off when a system fault occurs.
Table D-3 Ratings for AC 3PH 380V VFD models
Breaker rated
current (A)
Fast-acting
fuse rated
current (A)
Contactor rated current
(A)
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