GoHz 2-5kVA Frequency Converter Troubleshooting

50Hz and 60Hz power supplies are common used in our daily life, most of countries are using either 50Hz or 60Hz except Japan, and lots of industrial machines/home appliances are running on either 50Hz or 60Hz, not compatible with both frequency, hence, a device that can change between 50Hz and 60Hz is necessary in global business/travel etc. then GoHz frequency converter comes, it's a specialized device to convert between 50Hz and 60Hz to make the appliance work at its rated frequency among different countries. But sometimes, an issue may be happened during the long-time operation of the frequency converter, this article illustrates the potential problems of running a GoHz frequency converter (2kVA, 3kVA, 5kVA), and the methods to solve such problems.

Part.1
GoHz Frequency Converter Main Parts

Frequency converter inside overview Frequency converter main circuit board
Frequency converter side parts Frequency converter rectify circuit board



Part.2
GoHz Frequency Converter Internal Components Measuring Methods

2.1 Fuse Measurement
Find the fuse as following picture shows, turn the multimeter to Ω, the measured value should be less than 3Ω, if not, the fuse is failed.

Frequency converter fuse Frequency converter fuse measurement


2.2 White Feedback Capacitor Measurement (30uF)
Find the white feedback capacitor as following picture shows, pull out the 2 wires on the capacitor, turn the multimeter to Ω, the measured value should be greater than 20uF, if not, the feedback capacitor is failed.

Frequency converter feedback capacitor Frequency converter feedback capacitor measurement


2.3 Contactor Measurement
Find the contactors as following picture shows, turn the multimeter to Ω, press down the top side of the contactor while measure it, the unit of the measured value should be Ω, if not, the contactor is failed.

Frequency converter contactor Frequency converter contactor measurement


2.4 Electrolytic Capacitor Measurement (6800uF)
Note: The electrolytic capacitor should be discharged before measurement, a bulb or a resistor (≥20W 500Ω) is a good device for rapid discharging of the capacitor, if don't have such devices, just disconnect the power supply of the frequency converter for 10-20 minutes, make sure the capacitor measured values is less than 5V before proceeding with following steps.

Turn the multimeter to Ω, the measured value should be greater than 5000uF (the measured value will be more accurate by pulling out the wires on the capacitor), if not, the capacitor is failed.

Frequency converter electrolytic capacitor discharged Frequency converter electrolytic capacitor measurement


2.5 IGBT Measurement
Find the driver board as following picture shows, turn the multimeter to Ω, measure the points as following picture shows, the unit of the measured value should be kΩ, if the unit is Ω, the IGBT is failed.

Frequency converter IGBT measurement (1) Frequency converter IGBT measurement (2)
Frequency converter IGBT measurement (3) Frequency converter IGBT measurement (4)
Frequency converter IGBT Frequency converter IGBT measured value



Part.3
General Faults Troubleshooting

GoHz Frequency Converter Mainboard
Frequency converter mainboard

GoHz Frequency Converter Driver Board
Frequency converter driver board

3.1 Frequency converter warning in startup, in case of the LED2, LED7 are lighting up, check the followings:
Turn off the frequency converter's input & output switches, discharge the electrolytic capacitor (refer to 2.4), check the CN9 plug (mainboard), CN5 and CN6 plugs (driver board) are loosened or not, if not, check the fuse (refer to 2.1) and IGBT (refer to 2.5) is failed or not.

3.2 Frequency converter warning in startup, in case of the LED4, LED7 are lighting up, check the followings:
Turn off the frequency converter's output switch, and pull out the CT plug of the mainboard.

  1. If the frequency converter not warning anymore, means it's overloaded, contact GoHz to re-calculate the load capacity, choose a suitable frequency converter for your loads.
  2. If the frequency converter still warning, check the cement resistor is falling off or not, if not, adjust the potentiometer (mainboard) 2-3 cycles in anticlockwise direction, plug back the CT plug, and try again.

Frequency converter cement resistor
Frequency converter potentiometer

3.3 Frequency converter warning in startup, in case of the LED5, LED7 are lighting up, check followings:
Check the TEMP plug is loosened or not, and the temperature switch is well-connected or not.
Frequency converter temperature switch position
Frequency converter temperature switch

3.4 Frequency Converter No-output
Check the fuse is failed or not (refer to 2.1).

3.5 Display Off
Open the 2 side covers of the frequency converter, then open the front display, find the header board as following picture shows, measure the two points of the board by a multimeter (AC voltage), the measured value should be 8-9V (measure in power on), if not, the header board is failed.
Frequency converter header board

3.6 Frequency, Voltage Fluctuation
Check the feedback capacitor is failed or not, refer to 2.2
Check CN8 plug is loosened or not.
If still not solved, replace the mainboard.
Frequency converter mainboard

 

Related article: GoHz Frequency Converter Operation Guide, GoHz Frequency Converter Calibration

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