Question about Hitachi Variable Frequency Drive Inverter

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We have L300 P-900 HFEZ 90 kw,wich drive a IDF. After power shortage gen. set start but VFD is waiting to full stop of the IDF.

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The internal fan in the unit is need to get cool down as its motor get really hot .due to short circuit the motor gets a bit short so it has to be checked .because if the motor is getting short this will spoil the unit.
check out.keep updated.thanks.

Posted on Sep 09, 2009

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Posted on Jan 02, 2017

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Want to start fridge with generater what wattage do I need to start


find the decal on the fridge( side , back inside ) that has the specifications on it
it will show wattage usage for the motor , volts required and phase/cycle requirement
now for example --if the wattage is 750 watts , then the start up wattage will be almost double for a few seconds until the motor builds up speed
so the generator size will be 2000watts continuous
that is an example
however understand this , if you get a genset that just covers the watts required , it will use a lot more fuel under full load than a gen set that has a capacity of say 4 times the requirement
next point-- gensets that just do the job will struggle on compressor start up and that can cause problems on modern fridges power boards where as a larger genset will hardly notice the load of a starting compressor
Lastly always use a surge protection board before the fridge lead as gen sets can "hunt " and produce power surges which can damage a board of the fridge
In reality if you have an outage,-- mostly at night,-- I would consider a gen set of 6500 watts capacity as that will handle fridge , freezer and house lights
I run a scorpion 6.5 kw get set connected to the house by a three way switch and a caravan plug in the meter board and that runs 2 fridges , freezer , lights and one small plate on the electric stove and 20 liter fuel tank lasts up to 6 hours running
and no it is not an inverter type so the cost of the unit is around $1200.00 aud compared to an inverter type which is more than double that price
plenty of food for thought so that you make an informed decision

Aug 21, 2016 | Refrigerators

1 Answer

Gen runs when switch in auto even though power avail. Tried resetting ATS - waited 30 min. No luck. Only way to turn off is to move switch to stop/reset. Any ideas on what is broken?


have an electrician check the relay that is activated when the utility power fails
that is what starts the genset when it is in auto
it should also stop the get set when utility power comes back on

Nov 03, 2015 | Kohler 17RES 17 kW Generator

2 Answers

Does any one know how calculate power saving comparition in VFD and DOL?


1. Refer from the devices manufacturers guide to attain written instructions complimenting operations also complimenting setup from anothet location. 2. Visit the devices manufacturers online networks during business hours to attain expert assistance to operating devices .

Oct 23, 2014 | Electronics - Others

1 Answer

Why my 1996 golf from turn off while driving, it sparks but I won't start, need to wait 30 min and it will start with no problem but if it keep driving it it will do the same thing... please help me


which engine? see list , mind blowing, and what country>???
doing a 60k mile tuneup works, at least once a decade.
ever do the list of parts, spark and fuel , per operators guide?
that be first, 99% of bad running engines are that.
my guess , (weak based on only 1 fact) is has lost fueling
the ECU in the all cars 96 tries 10x to stop stalls.
the reasons are this: (top list)
1: lost 12vdc power ,see dash lamps or other lights go dead at stall>?
2: lost spark (tune up time?)
3: lost fueling, (try test fuel start now.
4: flooded, are the spark tips soaked in raw gasoline. (use wide open throttle cranking, does that work? this cuts fuel. (a secret mode)
5: ISC dead? (start car with 10% throttle) ok ISC is funky. clean it.

can you save the stall with fast right foot? (key fact here)

gen 3 engine list.
1.4 I4 40/44 kW (ABD/AEX/APQ)
1.6 I4 55 kW (ABU/AEA/AEE)
1.6 I4 74 kW (AEK/AFT/AKS)
1.8 I4 55 kW (AAM/ANN)
1.8 I4 66 kW (ABS/ADZ/ACC/ANP)
2.0 I4 85 kW (2E/ADY/AGG/AKR/ABA/AWG/AWF)
2.0 I4 16v 110 kW (ABF)
2.8 VR6 128 kW (AAA)
2.9 VR6 140 kW (ABV)
1.9 I4 D 47 kW (1Y)
1.9 I4 SDI 47 kW (AEY)
1.9 I4 TD 55 kW (AAZ)
1.9 I4 TDI 66 kW (1Z/ALE/AHU)
1.9 I4 TDI 81 kW (AFN/AVG)

Jul 10, 2014 | Cars & Trucks

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

3 Answers

Password of inverter


forget the password how can i solve it

Oct 18, 2012 | Delta Vfd007b43a 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...

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