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 To preset a target speed prior to enable, press the key whilst the drive is stopped. The display will show the target speed,

use the & keys to adjust as required then press the key to return the display to .

 Pressing the key will start the drive accelerating to the target speed.

 To allow the ACS255 to be controlled from the keypad in a forward and reverse direction, set parameter 1103 =2:

 Operation is the same as when parameter 1103=1 for start, stop and changing speed.

 Press the key. The display changes to ..

 Press to increase speed

 The drive will run forward, increasing speed until is released. Acceleration is limited by the setting in parameter 2202. The

maximum speed is the speed set in parameter 2008.

 To reverse the direction of rotation of the motor, press the key again.

7.3. Sensorless Vector Speed Control Mode

ACS255 can be programmed by the user to operate in Sensorless Vector mode, which provides enhanced low speed torque, optimum motor

speed regulation regardless of load and accurate control of the motor torque. In most applications, the default Voltage Vector control mode will

provide adequate performance, however if Sensorless Vector operation is required, use the following procedure.

 Enter the motor nameplate details into the relevant parameters as follows

o 9905 MOTOR RATED VOLTAGE

o 9906 MOTOR RATED CURRENT

o 9907 MOTOR RATED FREQUENCY

o (Optional) 9908 MOTOR RATED SPEED (Rpm)

o 9915 Motor Power Factor Cos Ø

 Select Sensorless Vector control mode by setting parameter 9903 MOTOR CONTROL MODE = 0

 Ensure that the motor is correctly connected to the drive

 Carry out a motor data Autotune by setting parameter 9910 MOTOR PARAMETER AUTO-TUNE ENABLE = 1

The Autotune will begin immediately when parameter 9910 MOTOR PARAMETER AUTO-TUNE ENABLE = 1 is set regardless of

the status of the drive enable signal. Whilst the autotune procedure does not drive or spin the motor, the motor shaft may still

turn slightly. It is not normally necessary to uncouple the load from the motor; however the user should ensure that no risk

arises from the possible movement of the motor shaft.

It is essential that the correct motor data is entered into the relevant drive parameters. Incorrect parameter settings can result

in poor or even dangerous performance.

ABB ACS255 User Manual

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