Settings And Diagnostics; Cavitation Protection - ABB ACS880 Supplement Manual

16 Program Features
external (remote) control mode of the drive, and disable it every time that user switches the
drive in local control mode (operates the drive with the panel). See the block diagram below.
86.01
Disable
Enable
87.02
FALSE
TRUE
Other
*
87.03
FALSE
TRUE
Other
*

Settings and diagnostics

￭
Parameters: 86.01, 87.01, 87.02, 87.03, 87.04.
Events: -

Cavitation protection

In the Cavitation detection control program, the Cavitation detection function is active always
when the program is enabled. The program protects the pump only when the program
controls the motor speed in case of cavitation.
If the Cavitation detection control program detects a possible cavitation situation and the
program has been configured to control the drive speed
source in 22.11 or 22.12), the program starts to decrease the speed by steps (86.05) in
order protect the pump. After each step, the program examines if there is still cavitation. If
cavitation continues, the drive reduces the speed more after a time delay (86.06) by a new
speed step.
If the program reduces the drive speed to the minimum protection speed (86.04) and
cavitation continues for a predefined time (86.07), the protection function generates a fault
or warning depending on the user selection (86.03).
At each speed step, if the drive does not detect cavitation for the pre-defined time (86.08),
the speed reference starts to increase by steps (86.05).
Cavitation detection and protection are inactive if:
Enable/disable Cavitation protection
control program
(1
87.04
Input1
In1 AND In2
In1 OR In2
(2
AND
87.01
Bit 0
(1 Bit 1
(2 Bit 2
(09.04 is set as the speed reference