16 Operating principle and I/O control
The parameter group 99 START-UP DATA includes all the basic settings required for
matching the ACS880 drive with the motor and to set the control panel display
language. You can set these parameters at the time of start-up. ABB recommends
not to change these settings at any time. See ACS880 primary control program
firmware manual [3AUA0000085967 (English)].
SPRS operation
The SPRS system synchronizes with the motor during the motor start-up and is
available for process control. You can start the motor using either grid rotor resistor or
liquid rotor resistor, based on the requirements of the user and the load torque.
The system integrates start-up functions and speed control functions into one drive
system. You can retrofit the system to an existing motor and retain the existing start-
up functions. The system determines how SPRS coordinates with the motor startup
functions.
The ACS880 Multidrive converter with dedicated control board and customized SPRS
control program facilitates optimum performance of the connected slip ring induction
motor. If there is no tachometer feedback, the control program provides system
performance by using special transducers for voltage reference.
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