ACS800 Excesive Delay during start
Hello.
We recently changed the speed control on a ACS800.02.0260.3 drive from 3 fixed speeds, defined by parameters 12.02 / 12.03 /12.04, to a 4-20mA signal connected to AI2.
We also use DI1 to start the drive and DI2 to change the rotation direction of the motor.
At first it all worked as it should, but the client felt a lack of power.
Trying to troubleshoot this lack of power, the drive was completely reset to factory parameters.
We went through the settings and reviewed all the parameters on the Drive to the previous ones, except for 99.10 before set to Standard and now ID Magn.
At this moment, when we attempt to start to move the Motor, it takes more than 8 seconds to actually move it.
While monitoring on the screen of the drive, we see the desired set point on the display, then the Amp reading starts to raise, reaching over 2 times the nominal current of the motor and suddenly (after 8 seconds or more) the motor reaches the desired set point abruptly.
Once the motor is running (at any speed other than zero) the reaction is smooth and as desired, from/to any rpm.
Application is on a Bow Thruster motor (380V/250A/132kW) on a 70 meter boat.
We recently changed the speed control on a ACS800.02.0260.3 drive from 3 fixed speeds, defined by parameters 12.02 / 12.03 /12.04, to a 4-20mA signal connected to AI2.
We also use DI1 to start the drive and DI2 to change the rotation direction of the motor.
At first it all worked as it should, but the client felt a lack of power.
Trying to troubleshoot this lack of power, the drive was completely reset to factory parameters.
We went through the settings and reviewed all the parameters on the Drive to the previous ones, except for 99.10 before set to Standard and now ID Magn.
At this moment, when we attempt to start to move the Motor, it takes more than 8 seconds to actually move it.
While monitoring on the screen of the drive, we see the desired set point on the display, then the Amp reading starts to raise, reaching over 2 times the nominal current of the motor and suddenly (after 8 seconds or more) the motor reaches the desired set point abruptly.
Once the motor is running (at any speed other than zero) the reaction is smooth and as desired, from/to any rpm.
Application is on a Bow Thruster motor (380V/250A/132kW) on a 70 meter boat.
Asked 5 months ago
Answers
0
Did you check with Ramp up function / Ramp time in VFD?
FYKI,Usually for Fan/Blower applications we need to set a ramp up and ramp down time for 20 second.
Please read the Ramp up / Ramp down function in the manual.
FYKI,Usually for Fan/Blower applications we need to set a ramp up and ramp down time for 20 second.
Please read the Ramp up / Ramp down function in the manual.
Answered 5 months ago
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