When a pump has been standing still for a specified number of hours, the RTU starts the
pump for a maintenance run.
Configure maintenance run
1. Specify the time between each maintenance run in the Auto start interval menu
(13_13).
2. Specify the pump run time during a maintenance run in the Auto start time menu
(13_14).
Disable maintenance run
Set auto start time to "0".
Operating Sequence
If a pump always start at the lowest sump level, this pump will normally run more than the
other pumps.
Function: Pump alternation
• Pumps part of the alternation change start levels while standing still after a complete
pump cycle.
• Pumps not part of the alternation always start at the same start level.
When a pump cannot start, the next alternating pump will start. Example: Pump is shut off
or faults.
Number of alternating pumps
Number of alternating
pumps
Alternates Pump
1?
AlternatesPump 2? Alternates Pump 3? Alternates Pump 4?
2 Yes Yes No No
3 Yes Yes Yes No
4 Yes Yes Yes Yes
Example: Three alternating pumps
The table shows when pumps start during different pump cycles:
S tart level Pump cycle 1 Pump cycle 2 Pump cycle 3
1 Pump 1 Pump 2 Pump 3
2 Pump 2 Pump 3 Pump 1
3 Pump 3 Pump 1 Pump 2
4 Pump 4 Pump 4 Pump 4
Example: Pump 2 faults with three alternating pumps
The table shows when pumps start if Pump 2 faults:
Start level Pump cycle 1 Pump cycle 2 Pump cycle 3
1 Pump 1 Pump 3 Pump 1
2 Pump 3 Pump 1 Pump 3
3 No pump No pump No pump
4 Pump 4 Pump 4 Pump 4
Configure pump alternation
1. Select "On" in the Pump alternation menu (13_7).
2. Specify number of alternating pumps in the Alternating pumps menu (13_8).
Disable pump alternation
Extended Configuration
22 APP 541 User manual
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