Goodrive270 series VFD for fan and pump Troubleshooting
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Pressure, temperature, displacement, and other signals of a sensor are collected and displayed by a
human-machine interaction device. The values are incorrectly displayed as follows after the VFD is
started:
1. The upper or lower limit is wrongly displayed, for example, 999 or -999.
2. The display of values jumps (usually occurring on pressure transmitters).
3. The display of values is stable, but there is a large deviation, for example, the temperature is
dozens of degrees higher than the common temperature (usually occurring on thermocouples).
4. A signal collected by a sensor is not displayed but functions as a drive system running feedback
signal. For example, the VFD is expected to decelerate when the upper pressure limit of the
compressor is reached, but in actual running, it starts to decelerate before the upper pressure
limit is reached.
5. After the VFD is started, the display of all kinds of meters (such as frequency meter and current
meter) that are connected to the analog output (AO) terminal of the VFD is severely affected,
displaying the values incorrectly.
6. Proximity switches are used in the system. After the VFD is started, the indicator of a proximity
switch flickers, and the output level flips.
Solution
1. Check and ensure that the feedback cable of the sensor is 20 cm or farther away from the motor
cable.
2. 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
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sensor.
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voltage of the power supply and the voltage endurance of the capacitor).
5. For interference on meters connected to the AO terminal of the VFD, if AO uses current signals
of 0 to -P$DGGDFDSDFLWRURIȝ)EHWZHHQWKH$2DQG*1'WHUPLQDOVDQGLI$2XVHV
voltage signals of 0±9DGGDFDSDFLWRURIȝ)EHWZHHQWKH$2DQG*1'WHUPLQDOV
Note:
When a decoupling capacitor is required, add it to the terminal of the device connected to the
sensor. For example, if a thermocouple is to transmit signals of 0 to 20mA to a temperature meter,
the capacitor needs to be added on the terminal of the temperature meter; if an electronic ruler is
to transmit signals of 0±30V to a PLC signal terminal, the capacitor needs to be added on the
terminal of the PLC.
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