INVT Goodrive300-01A Series, Руководство по эксплуатации

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Goodrive300-01A series VFD for air compressor Common EMC problems and troubleshooting
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
The communication cable cannot be routed with motor cable in the same cable tray;

In multi-machine application, the connection of communication cables between VFDs should
adopt chrysanthemum mode to improve anti-interference ability;

In multi-machine application, it is necessary to confirm that the drive capacity of the master is
strong enough;

For multi-machine connection, both ends should be connected to
120Ω terminal resistors.
Solution :

Check and confirm the motor ground line is connected to PE terminal of the VFD (if motor ground
line has been connected to the grounding bar of VFD cabinet, measure with multimeter to confirm
that the resistance between
grounding bar and PE terminal is less than 1.5Ω);

The VFD and motor cannot be common grounded along with the communication upper PC (PLC,
HMI, touch screen, etc.). It is recommended to connect the VFD and motor to the power GND,
and connect the communication upper PC to the ground pile separately;

Try to short connect reference GND terminal of VFD signal to the reference GND terminal of
upper PC controller signal to ensure the ground potential of their communication chips is the
same;

Try to short connect reference GND terminal of VFD signal to the grounding terminal (PE) of the
VFD.
E.3 Unstoppable or shimmering indicator caused by coupling of motor cable
Interference phenomena:

Unable to stop
For VFD system whose start/stop is controlled by S terminal, the motor cable and control cable are
routed in the same cable tray. After system starts, it cannot stop by S terminal.

Shimmering indicator
After VFD starts to run, shimmering, flickering or abnormal noise occurred to below equipment:
a) Relay indicator
b) Indicator of distribution box
c) PLC indicator
d) Indicating buzzer
Solution:
a) Check and confirm the abnormal signal cable is routed with motor cable motor cable at a distance
of at least 20cm;
b) Connect in parallel the digital input terminal (S) used for start/stop control with other idle digital
input terminals. For instance, S1 terminal is used for start/stop control, S4 terminal is idled, then
try to short connect S1 terminal with S4 terminal.