VFD vs Soft Starter - Inrush

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OK. Next question....
This is the drive I am wanting to use.
I am oversizing it just a bit to make double sure it will do what I want it to do.
My only concern is... can this drive achieve a 15-60 second ramp up time? (I said a 10-15 second ramp up time in an earlier post, but after more research on production side of things, we can deal with a longer ramp up time)
 
Jody Boehs said:
OK. Next question....
This is the drive I am wanting to use.
I am oversizing it just a bit to make double sure it will do what I want it to do.
My only concern is... can this drive achieve a 15-60 second ramp up time? (I said a 10-15 second ramp up time in an earlier post, but after more research on production side of things, we can deal with a longer ramp up time)
Click to expand...
Yes.
 
Jody Boehs said:
We have 2 600KW Generators that are independent of each other, each with a UPS system that allows them to start up and transfer without any loss of power in the plant.
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If it can transfer without any loss of power, then you shouldn't have to worry about startup current (unless it cycles on and off).
 
Before I retired probably ordered close to 100 VFD'S thru a very knowledgeable salesmen that only dealt with drives. He always asked me the model # if I was replacing an old drive where I could no longer secure parts. If it was a new installation always asked me the motor ampere. Always told me that drives are actually rated for output Amps and not horsepower. Every drive always had a maximum horsepower on label. We had a great drive tech who did nothing but work on drives for over 25 years. Think his company only charged around $200 ( 4 years ago ) to perform a new drive start up that extended free parts & LABOR for 3 years. Several times he had to replace an expensive board during thus extended warranty. I would strongly suggest that you hire a drive tech to perform start up and ask him a lot of questions while he is there. I was lucky enough to have company send me to a 2 week A & B drive class and since closed Finn Corr for a week drive class. Probably learned more by picking the drive tech mind while he was there. Some drive companies have great tech support but always had trouble with ABB for some reason. Took them two weeks and several emails just to tell me how to get the DC Buss voltage off touch of touch pad . Danfoss called the touch pad LCB for local control panel. You should have no problem running this 480 volt motor on a drive. Don't let the hundreds of parameters scare you. Only use maybe a combination of 20 of them. First drives that I worked on back in early 1980's only had a few pots to adjust ramp up & down speed and a few other things. Best thing was when they went all digital & IGBT'S.
 
Jody Boehs said:
OK. Next question....
….
My only concern is... can this drive achieve a 15-60 second ramp up time? (I said a 10-15 second ramp up time in an earlier post, but after more research on production side of things, we can deal with a longer ramp up time)
Click to expand...
I would say probably. A drive cannot make a motor produce locked rotor torque for more than a limited time, usually 60 seconds for a Constant Torque rated drive. Acceleration time has everything to do with torque. We are ASSuming that the motor, using Locked Rotor Torque, is capable of accelerating the machine in 10-15 seconds and if so, the drive can make that happen.
 
Jraef said:
I would say probably. A drive cannot make a motor produce locked rotor torque for more than a limited time, usually 60 seconds for a Constant Torque rated drive. Acceleration time has everything to do with torque. We are ASSuming that the motor, using Locked Rotor Torque, is capable of accelerating the machine in 10-15 seconds and if so, the drive can make that happen.
Click to expand...
There is some load on this motor when it starts. I just don't know how to measure it. It runs an emulsifier. There is a series of blades that it spins and those blades are against some fixed sheer plates (not sure if that's what they're called). A gear pump is used to pump product into this emulsifier. Then is "liquifies" it and pumps it into a kettle.
 
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