Goodrive300-21 integrated machine for air compressor
Common EMC problems and solution
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Solution to mal-operation of RCD (on the part of inverter)
a) Try to disassemble the jumper cap in "EMC/J10" (see chapter 2.1.2 Terminal diagram of the main
circuit for the position of J10 jumper)
b) Try to decrease the carrier frequency to 1.5KHz (P00.14=1.5).
c) Try to modify the modulation mode to "3PH modulation and 2PH modulation" (P08.40=00).
Solution to mal-operation of RCD (on the part of system distribution)
a) Check and ensure that the power cable is not soaking in water.
b) Check and ensure that the cables are not damaged or spliced.
c) Check and ensure that no secondary grounding is performed on the neutral wire.
d) Check and ensure that the main power cable terminal is in good contact with the air switch or
contactor (all screws are tightened).
e) Check 1PH powered devices, and ensure that no earth lines are used as neutral wires by these
devices.
f) Do not use shielded cables as inverter power cables and motor cables.
Leakage protection of motor autotuning
During motor autotuning, the measurement on differing motor parameters is conducted step by step,
in which the first two steps is to measure the resistance of motor stator/rotor while the inverter will
output square wave to motor stator winding at 4kHz (default carrier frequency), as leakage current
generated by 4kHz carrier frequency against distributed capacitance between motor rotor and stator
during charging/discharging is quite obvious, which may cause mal-operation of RCD. If such
problem occurred, bypass RCD first and restore after parameter autotuning is completed.
D.5 Live device chassis
After the inverter is started, there is sensible voltage on the chassis, and you may feel an electric
shock when touching the chassis. The chassis, however, is not live (or the voltage is far lower than
the human safety voltage) when the inverter is powered on but not running.
Solution:
a) If there is power distribution grounding or ground stud on the site, ground the cabinet chassis of
the inverter through the power ground or stud.
b) If there is no grounding on the site, you need to connect the motor chassis to the ground terminal
PE of the inverter, and ensure that the jumper at "EMC/J10" on the middle casing of the inverter is
shorted. For the position of EMC/J10 jumper, see chapter 2.1.2 Terminal diagram of the main
