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The lighted display has started to darken - cannot read frequency display, etc. Is there a way I can fix it by changing a bulb or an LED?


This problem is not depending on a kind of LED or bulb. The reason is that the display is a VFD (Vacuum Fluorescent Display) with no additional illumination.
The most common problem with VFD is, that the heater of the VFD is going bad. You can't change it because it is built-in. For experienced repairman it is possible to higher the heater voltage or the anode supply to gain the brightness a bit. But thats a tricky thing.
Sometimes it may help to clean the display cover from inside. This is what you can do first. The reason for getting dark by dust inside the cover is that the VFD is working with a anode voltage wich is a bit higher (about 30V - 50V). This sucks the very fine dust electrostatically into the casing.
To clean up the protective display cover from inside, remove the casing and also the cover in front of the VFD and clean the dsplay protection cover (the VFD istself is usually clean). Maybe that's it - but maybe not (that means the VFD is going bad).
Hope it helps.

Oct 14, 2013 | Aiwa AV-X120

1 Answer

Problem With Eaton 9000x VFD drive. All voltages are good. Cannot get drive to activate motor.


Check the windings of the motor at the VFD output. Start by killing power to the VFD. Next, check for voltage on L1, L2 & L3 and U, V & W line to line & line to ground. If all indicate zero, connect an ohm meter from U to V, then V to W and finally W to U. You should see a very low resistance - single digit ohms. They should all be the same value. If that check so out, test from ground to: U, then to V and finally W. This should indicate a very high resistance - 1 meg ohm or more. Do NOT attempt to use a megger to measure ground to U Vand W while connected to the VFD terminals! Low numbers indicate that the insulation on the windings inside the motor are breaking down, and some current is flowing in the ground wire which is dangerous. If all these checks are ok, the likelihood of the motor being to problem is minimal. You should be able to start / run the motor without damage to it at full line voltage - assuming it can start the load at full speed - and that the load can be safely started at full speed. If no to those questions - you should decouple the motor from the load before proceeding. Next, try running the motor "across the line". Many VFD provide such an option and call this "bypass mode" or sometimes "Manual"

Doing this will cause the motor to appear across the *full line voltage* and the motor will attempt to come up to 100% speed *as fast* as it possibly can. If the motor starts & runs, the issue is related to the VFD itself. You may have a loose control wiring, open input / output fuses, etc.

Review the manual with your options, here.

Oct 09, 2013 | Electrical Supplies

2 Answers

What is the variable frequency drive?


VFD is a device used for speed control of 3ph induction motors & automation process control

Mar 18, 2013 | Hitachi Variable Frequency Drive Inverter

1 Answer

We had a Delta vfd037b23a running a fan (we only use it to change the speed) and it was 3 phase input and only drawing 7.5 amps (max is 17). We have moved and no longer have 3 phase line power, we do have...


To cut down on power usage, look into either purchasing or trading for a smaller three phase inverter.


Or the best choice for you is to get a VFD that runs off either single or three phase so that you can move it about at will (to single or three phase set ups).


As for hurting the VFD by using it in the overpowered but underused mode, not likely.

Oct 29, 2012 | Delta Vfd037b23a Ac Drive Vfd B Inverter...

1 Answer

Were can i buy delta vfd at dubai


can u give ur tel no:i want to buy 1.5 kw delta vfd

Nov 14, 2011 | Delta Vfd750b43a Ac Drive Vfd B Inverter...

1 Answer

Thermal overload occurs


I too am experiencing an "oc2" on my gvx1000-1.5-t unit after replacing original motor with near identical, however, relacement motor is rated for 60hz and the vfd is programmed for 50hz. but I don't have a manual nor does my machine manufacturer, so I'm trying to source a manual to alter the vfd parameters for the new motor. My original problem was a locked shaft on the original motor and caused the oc2 fault, but I bent the shaft trying to break the motor flange free and now my spare won't work either :-(. Try removing the load from your unit and see if you still get a fault, if so, you probabley have an enternal problem with the vfd. if by removing the load you don't get a fault, check for anything seized in the drive components, including the motor shaft itself(bad bearings will do it!). An amp test of your load, if it runs long enough to test, will tell you if you're exeeding the vfd's programmed full/max amp set point. Adjust the set point or remove the cause of the excessive amp pull. Good luck. Wouldn't happen to have a manual on the unit I'm looking for, would you?

Jan 23, 2011 | Inverter Bonfiglioli Gvx1000

2 Answers

Any real time function is there in hitachi VFD..? VFD need to operate it certain speed based on time.


Ther are settable ramp up and ramp down times and there are settable speeds (max and run)

Mar 27, 2010 | Hitachi Variable Frequency Drive Inverter

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