33
11.7.14 Standby pumps (4.2.3)
Fig. 49 Standby pumps
Description
This function makes it possible to limit the maximum performance
of the system, by selecting one or more pumps as standby
pumps.
If a three-pump system has one standby pump, maximum two
pumps are allowed to be in operation at a time.
If one of the two pumps in operation has a fault and is stopped,
the standby pump will be started. The performance of the system
is thus not reduced.
The status as standby pump alternates between all pumps.
Setting range
The number of possible standby pumps in a system is equal to
the total number of pumps in the system minus 1.
Setting via control panel
1. Mark the Settings menu with .
2. Mark Pump cascade control with or , and press
.
3. Mark Standby pumps with or , and press .
4. Select the number of standby pumps with or , and
save with .
Factory setting
The number of standby pumps is set to 0, i.e. function is
deactivated.
11.7.15 Forced pump changeover (4.2.4)
Fig. 50 Forced pump changeover
Description
This function ensures that the pumps run for the same number of
operating hours.
In certain applications, the requirement remains constant for long
periods and does not require all pumps to run. In such situations,
pump changeover does not take place naturally, and forced pump
changeover may thus be required.
Once every 24 hours, the CU 351 checks if any pump running has
a larger number of operating hours than pumps that are stopped.
If this is the case, the pump will be stopped and replaced by a
pump with a lower number of operating hours.
Setting range
The function can be activated/deactivated. The hour of the day at
which the changeover is to take place can be set.
Setting via control panel
1. Mark the Settings menu with .
2. Mark Pump cascade control with or , and press
.
3. Mark Forced pump changeover with or , and press
.
4. Mark Activated with or , and press . The check
mark in the right box shows that the function has been
activated.
5. Mark Time for changeover with , and press .
6. Set the time with or , and save with .
Factory setting
The function is activated. The time is set to 03:00.
TM03 2366 4607
TM03 2365 1109
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