890CS & 890CD Common Bus Units
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4-52
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
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C
D
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E
The Autotune Feature
Note You MUST carry out an Autotune, unless the drive is in Volts/Hz Mode (Open-Loop Drive) or in PMAC
control mode (Autotune will not perform in these modes as it is unnecessary).
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 SET/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".
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