Frequency Inverter ST600 Series High-Performance Multifunction VFD Troubleshooting
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2. Solution to RCD misoperation (handling the VFD)
(1) Try to remove the jumper cap at "EMC/J10" on the middle casing of the VFD.
(2) Try to reduce the carrier frequency to 1.5 kHz (P00.14=1.5).
(3) Try to modify the modulation mode to "3PH modulation and 2PH modulation" (P8.40=0).
3. Solution to RCD misoperation (handling the system power distribution)
(1) Check and ensure that the power cable is not soaking in water.
(2) Check and ensure that the cables are not damaged or spliced.
(3) Check and ensure that no secondary grounding is performed on the neutral wire.
(4) Check and ensure that the main power cable terminal is in good contact with the air switch or
contactor (all screws are tightened).
(5) Check 1PH powered devices, and ensure that no earth lines are used as neutral wires by these
devices.
(6) Do not use shielded cables as VFD power cables and motor cables.
7.7.5 Live device chassis
Phenomenon
After a VFD 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 VFD is powered on but not running.
Solution
1. If there is power distribution grounding or ground stud on the site, ground the cabinet chassis of the
drive system through the power ground or stud.
2. If there is no grounding on the site, you need to connect the motor chassis to the ground terminal
PE of the VFD, and ensure that the jumper at "EMC/J10" on the middle casing of the VFD is shorted.
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