Goodrive300-01A-RT series integrated machine Common EMC problems and troubleshooting
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consistent with that of the upper PC.
If it is confirmed that the abnormality is caused by interference, rule out the problem cause by
below means.
Troubleshooting:
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.
Solutions:
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, 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:
Stop failure
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.
Indicator shimmering
After a VFD is started, the relay indicator, power distribution box indicator, PLC indicator, and
indication buzzer shimmers, blinks, or emits unusual sounds unexpectedly.
Solutions:
Check and confirm the abnormal signal cable is routed with motor cable at a distance of at least
20cm.
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, S3 terminal is idled, then
try to short connect S1 terminal with S3 terminal.
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