ABB ACQ580, Руководство по прошивке

Страница: 58 / 422

54 Program features

Pump cleaning
The pump cleaning function is mainly used in wastewater applications to prevent
solid particles from being stuck on the pump impellers or in the piping. This function
consists of a programmable sequence of forward and reverse rotations of the pump
to shake off and remove any residue or rags on the impeller or piping.
The Pump cleaning function prevents:
• blockages and decreases the need of manual cleaning
• increases the lifetime of the pump, pipes and impellers, and
• improves energy efficiency of the system.
Pump cleaning sequence
The drive starts cleaning with a pulse in the opposite direction of the running
direction. The speed step size is same for both positive and negative directions.
The pump cleaning sequence can have several positive and negative direction speed
steps in one cleaning sequence.
When the negative speed is not allowed, the drive ignores phases 1…4.
Note: Cleaning in a negative direction requires negative minimum speed/frequency in
parameter 30.11 Minimum speed / 30.13 Minimum frequency .
Normal operation
Time
1
2 3 4
5
6
7
8
9
10
Normal operation
2 3 4
5
6
7
8
9
83.20
83.20
The time from zero speed to 83.20 Cleaning speed step is considered as Time to zero speed.
Sequence Parameter Sequence Parameter
1 83.26 Time to zero-speed 6 83.25 Time to cleaning speed
2 83.25 Time to cleaning speed 7 83.27 Cleaning on time
3 83.27 Cleaning on time 8 83.26 Time to zero-speed
4 83.26 Time to zero-speed 9 83.28 Cleaning off time
5 83.28 Cleaning off time 10 83.25 Time to cleaning speed