dear engineer ,
thanks alot for your assistance
i raised the run boost parameter and acc boost but the max output voltage only comes to 100 v but frquency going up and the motor move slowly,where the SPEED ON THE DRIVE GO TO 400 RPM BUT THE ACTUAL SPEED OF MOTOR ABOUT 150 RPM
I SEE THAT OUTPUT VOLTAGE NOT CORRECT AND THE MOTOR SPEED NOT SAME SPEED ON THE DRIVE
Let me make sure that I understand what you are trying to solve .. apparently I missed on the last post.
You are trying to start your motor.
- you bumped the boost setting up
- you adjusted the acceleration boost
The drive normally starts the motor at a certain speed. With a motor rated for 1770 rpm, with an 1800 rpm 4 pole motor (nominal) that would be 30 rpm of slip, or about 0.5 Hz.
The drive starts the acceleration of the motor, increasing the frequency and the output voltage as it goes.
If you are showing 400 rpm on your motor output, but the motor is actually turning at 150 rpm, your slip is 400 - 150 = 250 rpm. 250 rpm is very high slip. That is over 4 Hz.
If you take a look at the torque versus speed curve for an induction motor ... here
https://en.wikipedia.org/wiki/Induction_motor
Under the standard torque section you will see that there is a hump in the torque versus speed curve. It's in the range of 200% to 250% of rated torque for a high efficiency T frame motor, at somewhere in the range of 200 rpm of slip.
I think your VFD won't speed up because it is already putting out the maximum current that it can at the speed it is turning. But that's just a guess, based on what you are describing.
If this was a new install, I'd say your motor is not powerful enough. But you say this was running .. so it should still run ... so something is taking too much power. I'd suggest that your load is likely having some mechanical problems.