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Join Date: May 2009
Posts: 6

O/L Problem in Drive

05/28/2009 1:09 AM

Dear sir

we have T verter N2 series 22 kw drive being used for centrifuse application.Now,we are facing a problem of frequent tripping of drive on Overload where as the actual load remains with in permissible limit ie 20 Amp.we set the current limit 30 amp ,Ramp up time 170 sec and ramp down time 225 sec.but problem could not be solve.so looking for ur expert comments

Regd

Satish

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Power-User

Join Date: Nov 2008
Location: India
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#1

Re: O/L Problem in Drive

05/28/2009 8:19 AM

dear ,

Drive ... if there is no electronics fault, pl. check the following

1. loose connections in motor terminals up to drive terminal.

2. lugs condition of power cable, if it is oxidised, need replacement, re connections.

tripping is due to the third harmonics flowing in the drive electronics.

regards

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#2

Re: O/L Problem in Drive

05/28/2009 9:34 AM

The N2 drive can display multiple OL faults. One is Motor OL, the other is Drive OL. Which type are you getting?

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#7
In reply to #2

Re: O/L Problem in Drive

06/23/2009 4:01 AM

motor ol

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#3

Re: O/L Problem in Drive

05/29/2009 12:40 AM

HI dear

the solution of yoour problem is so simple just put the circuit out of the inverter n wash it with thinner n then change the I.G.B.T module inside and put it back on the work feild it will be ok then thnkz to me at Farri_1433@yahoo.com got it

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#5
In reply to #3

Re: O/L Problem in Drive

05/29/2009 3:31 PM

Hopefully the OP understands this is a sarcastic joke.

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Anonymous Poster
#6
In reply to #5

Re: O/L Problem in Drive

06/04/2009 1:24 AM

---any ideas on what a cetrifuse might be?? Or am I just ignorant.

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Commentator

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#4

Re: O/L Problem in Drive

05/29/2009 7:47 AM

Centrifuses are complicated loads to drive via drives. If the other suggestions does not work you may want to try a resistor on the drive to prevent regenerative feedback from the centrifuse (via the motor) to the drive.

Centrifuses once on speed become a flywheel and starts driving the motor (resonate), which in turns generate a back emf to drive. The drive then may see this as an overload condition (not to fimiliar with the N2).

The solution is to connect a resistor (manufacturer of drive to advise the resistance value and watt rating) to the dc circuit of the drive. The resistor will absorbed the spikes generated back to the drive.

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#8
In reply to #4

Re: O/L Problem in Drive

06/23/2009 2:17 PM

That actually turns up as an Over Voltage to the drive, not an Over Load.

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#9

Re: O/L Problem in Drive

06/23/2009 2:19 PM

A Centrifuge is as mentioned, a large flywheel load. It has a lot of inertia to get it moving, but once moving it doesn't take a lot of power to keep it moving. So if the VFD is tripping on OL during acceleration, then you are attempting to accelerate too fast. If it is tripping on OL after it is running at full speed, you have too small of a motor. This is assuming you have properly programmed the VFD for the motor parameters. If you did not do that, it may be just a simple issue of properly setting up the VFD for the application.

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