Goodrive350-19 series VFD for crane
Troubleshooting
-395-
2.
Check whether the two ends of line A or B are connected reversely.
3.
Check whether the communication protocol (such as the baud rate, data bits, and check bit) of
the VFD is consistent with that of the upper computer.
If you are sure that communication exceptions are caused by interference, you can resolve the
problem through the following measures:
1. Perform simple inspection.
2. Arrange the communication cables and motor cables in different cable trays.
3. In multi-VFD application scenarios, adopt the chrysanthemum connection mode to connect the
communication cables between VFDs, which can improve the anti-interference capability.
4. In multi-VFD application scenarios, check and ensure that the driving capacity of the master is
sufficient.
5.
In the connection of multiple VFDs, you need to configure one 120 Ω terminal resistor on each
end.
Solution
1. Check and ensure that the ground wire of the motor is connected to the PE terminal of the VFD (if
the ground wire of the motor has been connected to the ground block, you need to use a
multimeter to measure and ensure that the resistance between the ground block and PE terminal
is lower than 1.5
Ω).
2. Do not connect the VFD and motor to the same ground terminal as the upper computer (PLC,
HMI, and touch screen). It is recommended that you connect the VFD and motor to the power
ground, and connect the upper computer separately to a ground stud.
3. Try to short the signal reference ground terminal (GND) of the VFD with that of the upper
computer controller to ensure that ground potential of the communication chip on the control
board of the VFD is consistent with that of the communication chip of the upper computer.
4. Try to short GND of the VFD to its ground terminal (PE).
5. Try to add a safety capacitor of 0.1
μF on the power terminal of the upper computer (PLC, HMI,
and touch screen). During this process, pay attention to the voltage of the power supply and the
voltage endurance capability of the capacitor. Alternatively, you can use a magnet ring (Fe-based
nanocrystalline magnet rings are recommended). Put the power L/N line or +/- line of the upper
computer through the magnet ring in the same direction and wind 8 coils around the magnet ring.
8.7.3 Failure to stop and indicator shimmering due to motor cable coupling
Interference phenomenon
1. Failure to stop
In a VFD system where an S terminal is used to control the start and stop, the motor cable and control
cable are arranged in the same cable tray. After the system is started properly, the S terminal cannot