Insulation Inspection; Breaker And Electromagnetic Contactor - INVT Goodrive350 Series Operation Manual

Goodrive350 series high-performance multifunction VFD
Input power cable
Control cable
D.4.7 Insulation inspection
Check the motor and the insulation conditions of the motor cable before running the motor.
1. Ensure that the motor cable is connected to the motor, and then remove the motor cable from the
U, V, and W output terminals of the VFD.
2. Use a megameter of 500 V 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 Breaker and electromagnetic contactor
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.
The fuse/breaker model selection for a VFD in a parallel product is consistent with that for a single
VFD, and the capacity of the fuse/breaker for a parallel product is twice the rated current of the
parallel product. (For details about the rated current of each parallel product, see 3.8 Ratings of
parallel products.

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.
VFD model
GD350-1R5G-4
GD350-2R2G-4
Min. distance:
200 mm
Cable arrangement distances
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.
Table D–5 AC 3PH 380V(-15%)–440V(+10%)
Breaker rated
current (A)
6
10
Motor cable
Power cable
Motor cable
Min. distance: 500 mm
Fast-acting fuse
rated current (A)
10
10
-401-
Optional peripheral accessories
Min. distance:
300 mm
Control cable
Contactor rated current
(A)
9
9