Standby Pumps (4.2 - Grundfos CONTROL MPC Installation And Operating Instructions Manual

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
.
3. Mark Standby pumps with
4. Select the number of standby pumps with
save with .
Factory setting
The number of standby pumps is set to 0, i.e. function is
deactivated.
.
or , and press
or , and press .
or , and
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
.
3. Mark Forced pump changeover with
.
4. Mark Activated with
mark in the right box shows that the function has been
activated.
5. Mark Time for changeover with
6. Set the time with or
Factory setting
The function is activated. The time is set to 03:00.
.
or , and press
or , and press
or , and press . The check
, and press .
, and save with .
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