Goodrive300-21 integrated machine for air compressor
Common EMC problems and solution
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the exception is not necessarily caused by interference. You can find out the causes as follows:
Check whether the RS485 communication bus is disconnected or in poor contact.
Check whether the two ends of line A or B are connected reversely.
Check whether the communication protocol (such as the baud rate, data bits, and check bit) of
the inverter 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:
Arrange the communication cables and motor cables in different cable trays.
In multi-inverter application scenarios, adopt the chrysanthemum connection mode to connect
the communication cables between inverters, which can improve the anti-interference
capability.
In multi-inverter application scenarios, check and ensure that the driving capacity of the master
is sufficient.
In the connection of multiple inverter
s, you need to configure one 120 Ω terminal resistor on
each end.
Solution:
Check and ensure that the ground wire of the motor is connected to the PE terminal of the
inverter (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).
Do not connect the inverter and motor to the same ground terminal as the upper computer
(PLC, HMI, and touch screen). It is recommended that you connect the inverter and motor to
the power ground, and connect the upper computer separately to a ground stud.
Try to short the signal reference ground terminal (GND) of the inverter with that of the upper
computer controller to ensure that ground potential of the communication chip on the control
board of the inverter is consistent with that of the communication chip of the upper computer.
Try to short GND of the inverter to its ground terminal (PE).
D.3 Failure to stop and indicator shimmering due to motor cable coupling
Interference phenomenon
Unable to stop
In an inverter 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 be used to stop the inverter.
