# Slip Compensation

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### #1 Crv

Crv

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Posted 29 April 2010 - 04:25 PM

Hi all!, I'm having some troubles with a VSD it's a mitsubishi F700 the motor is loosing power, I'm try to up with toorque boost Pr 0. but it's a little diference, I was reading about Slip compensation but not very sure how I can set it up, there are 3 parameters
Pr 245=Rated Slip from 0 to 50%
Pr 246=Slip compensation time constant from 0.01 to 10s
Pr 247=Constant-output region slip compensation selection
Not sure how I can set each one to working very well, without damage motor or vsd. any advice

### #2 AB2005

AB2005

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Posted 30 April 2010 - 11:34 AM

QUOTE (Crv @ Apr 29 2010, 09:25 PM) <{POST_SNAPBACK}>
I'm try to up with torque boost Pr 0. but it's a little difference,

What thing is the difference?
You can increase the torque boost within max current limit. But first;

1) Is it a new application or a replacement?
2) What is the type of load?
3) What is the name plate info of motor and drive?
4) Do you face problem only during start up?
5) When motor loose power, what is the current, freq, and out put voltage?

"Don't assume any thing, always check/ask and clear yourself".

### #3 Crv

Crv

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Posted 30 April 2010 - 02:35 PM

Hi thanks for respond, i get more data
The diference to increase the torque boost is in the output voltage, if I increas too high or too low output voltage decrease, so i decide to put in a 0.8.

It's a replacement first we had a VSD 40HP 220V, with 2 motor, and now we replace with to VSD 20HP 220V each one, the motor are for 220V, 15Hp.
Type of load i can't explain you by english, but it's to make cement block it's necesary to shake.

The problem is whe the drive show 68Hz it's a maximun frequency voltage is 220V, start with 35Amps and decresae to 25Amp I think that's the problem I need the current constant but i don't know how to do it.

QUOTE (AB2005 @ Apr 30 2010, 05:34 AM) <{POST_SNAPBACK}>
What thing is the difference?
You can increase the torque boost within max current limit. But first;

1) Is it a new application or a replacement?
2) What is the type of load?
3) What is the name plate info of motor and drive?
4) Do you face problem only during start up?
5) When motor loose power, what is the current, freq, and out put voltage?