38 Program features
Cleaning sequence steps
1. The pump system meets the triggering conditions as per the operating mode
(83.12) selected. At this condition, normal operation stops and the drive uses the
target time defined in parameter 83.26 Time to zero-speed to reach zero speed.
2. Acceleration for cleaning is defined by parameter 83.20 Cleaning speed step.
3. The pump runs at cleaning speed for the time defined by parameter 83.27
Cleaning on time.
4. The pump decelerates to zero-speed. Time to zero speed is defined by parameter
83.26 Time to zero-speed.
5. The pump is stopped until parameter 83.28 Cleaning off time is elapsed.
6. The pump accelerates the pump speed to positive direction. See parameter 83.25
Time to cleaning speed.
7. The pump runs at the positive cleaning speed. See parameter 83.27 Cleaning on
time.
8. The pump decreases the pump speed back to zero defined by parameter 83.26
Time to zero-speed.
9. The drive waits until the parameter 83.28 Cleaning off time is elapsed. A new
cleaning sequence starts or normal operation starts.
10. The pump starts following speed/frequency reference of the active control
location. During acceleration to speed/frequency, the drive follows pump cleaning
acceleration time 83.25 Time to cleaning speed.
The cleaning sequence starts based on the selected triggering conditions. The
cleaning sequence follows the diagram on page 36.
You can start the pump cleaning sequence in these conditions:
• On start cleaning now (defined by parameter 83.12 Start pump cleaning)
• Manually (for example, DI4 to DI6, defined by parameter 83.12 Start pump
cleaning)
Settings
Parameter group 83 Pump cleaning (page 161).
Dry run protection
The dry run protection function automatically detects and avoids running of a pump
with no flow of water in the pump. The condition at which the pump runs with no load
is called as dry run condition. The dry run protection can be activated through any of
the following method:
• Dry run protection through DI
• Dry run protection through minimum load current
ACQ80 FW.book Page 38 Thursday, February 14, 2019 11:33 AM
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