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890CS & 890CD Common Bus Units
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
The Autotune Feature
Note
You MUST carry out an Autotune if you intend to use the drive in Sensorless Vector Fluxing Mode or
Closed-Loop Vector Mode The drive will not perform an Autotune when in Volts/Hz Mode (Open-Loop
Drive.) An Autotune is not necessary in this control mode.
The Autotune feature identifies motor characteristics to allow the drive to control the motor.
It loads the values into the parameters below, which are in the QUICK SETUP menu.
PREF
Parameter
Description
Note
71.03
ENCODER INVERT Encoder direction
Parameter is only set up if drive is
configured to run as Closed-loop Vector
Not measured by Stationary Autotune
27.06
MAG CURRENT
Magnetising current
Not measured by Stationary Autotune
27.14
STATOR RES
Per phase stator
resistance
27.15
LEAKAGE INDUC Per phase stator
leakage inductance
27.16
MUTUAL INDUC
Per phase mutual
inductance
27.17
ROTOR TIME
CONST
Rotor time constant
This is identified from magnetising
current and motor nameplate rpm
For further information on the functions of all parameters, refer to Appendix D: "Programming".