Goodrive270 series VFD for fan and pump Troubleshooting
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difference between two actions need to be longer than 20ms. For example, 1s, 0.5s, and 0.2s.
(3) For circuits in VFD systems, electromagnetic RCDs are recommended. Electromagnetic RCDs
have strong anti-interference capability, and thus can prevent the impact of high-frequency
leakage current.
Low cost, high sensitivity, small in volume,
susceptible to voltage fluctuation of the
grid and ambient temperature, and weak
anti-interference capability
Requiring highly sensitive, accurate, and stable
zero-phase sequence current transformer, using
permalloy high-permeability materials, complex
process, high cost, not susceptible to voltage
fluctuation of the power supply and ambient
temperature, strong anti- interference capability
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" (P08.40=00).
3. Solution to mal-operation of RCD (on the part of system 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
After the 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 VFD 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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