D.4.4 Insulation Checking - INVT Goodrive35 Series Operation Manual

Goodrive35 Series Closed-loop Vector Control VFD

D.4.4 Insulation checking

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 rated current of the VFD.
 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.
D.5.1 AC 3PH 380 V (-15%)–440 V (+10%)
Model
GD35-1R5G-4-C1/D1/H1
GD35-2R2G-4-C1/D1/H1
GD35-004G-4-C1/D1/H1/H2
Input power cable
90°
Min. 200mm
Control cable
Figure D-3 Wiring layout distances
Breaker (A)
Motor cable
Power cable
Motor cable
Min. 500mm
Fuse (A)
15 16
17.4 16
30 25
277
Optional peripheral accessories
Min. 300mm
Control cable
The rated working current
of the contactor (A)
10
10
16