Configure EX-mode
• To enable EX-mode, select "On" in the EX mode menu (16_2).
• To disable EX-mode, select "Off".
Related configuration
EX-mode affects General purpose inputs.
Trim Pump Control
Delay a Pump Start
The RTU can delay the start of a pump.
Type of start delay
Start delay Condition Delay for next pump
Minimum pump stop time A pump has stopped. 5 seconds
Time between starts A pump has started. Configurable
Power failure Power supply has been restored after a power
failure.
10 seconds
Specify time between pump starts
Specify the time in the Time betw. starts, P1 – P4 menus (13_9 –-13_12).
Limit Pump Operation
The RTU can limit:
• Number of pumps running at the same time.
• Maximum time any pump is allowed to run continuously.
Example: The maximum runtime is useful to stop a clogged pump from running too long.
Function: Maximum number of running pumps
When the maximum number of pumps are running at the same time, no idle pump is
allowed to start.
Function: Maximum runtime
When a pump has run longer than the maximum run time:
• Pump is temporarily stopped.
• Maximum runtime alarm is generated.
Considerations: Maximum runtime
To avoid a flooded pump sump, the maximum runtime must exceed one pump cycle.
Consider that the following can add time to a pump cycle:
• High level runtime. (Reference: see page14).
• Stop delay. (Reference: see page14).
Limit pump operation
1. Specify maximum number of running pumps in the Max. no. run. pumps menu
(13_6).
2. Specify maximum runtime for pumps in the Max. run time menu (13_14).
Disable runtime limit
Set maximum runtime to "0".
Maintenance run
A pump that stands still for a long time can be run automatically with regular intervals. This
is useful to keep the mechanical seals in the pump in shape.
Function: Maintenance run
Extended Configuration
APP 541 User manual 21
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