Grundfos Control MPC-Serie Installationsanleitung Seite 38

8.7.13 Pump cascade control (4.2)
Fig. 52 Pump cascade control
In the menu, you can set the functions connected to pump
cascade control.
The following menus can be selected:
• Min. time between start/stop
• Max. number of starts/hour
• Standby pumps
• Forced pump changeover
• Pump test run
• Pilot pump
• Pump stop attempt
• Pump start and stop speed
• Min. performance
• Compensation for pump start-up time.
8.7.14 Min. time between start/stop (4.2.1)
Fig. 53 Min. time between start/stop
Description
The function ensures a delay between the starting and stopping
of one pump and the starting and stopping of another pump.
The purpose is to prevent hunting when pumps start and stop
continuously.
Setting range
From 1 to 3600 seconds.
Setting via the operating panel
Settings > Pump cascade control > Min. time between start/stop.
Factory setting
The setting is done in the startup wizard and depends on the
application.
38
8.7.15 Max. number of starts/hour (4.2.1)
Fig. 54 Max. number of starts/hour
Description
The function limits the number of pump starts and stops per hour
for the complete system. It reduces noise emission and improves
the comfort of systems with mains-operated pumps.
Each time a pump starts or stops, CU 352 calculates when the
next pump is allowed to start/stop in order not to exceed the
permissible number of starts per hour.
The function always allows pumps to be started to meet the
requirement, but pump stops will be delayed, if needed, in order
not to exceed the permissible number of starts per hour.
The time between pump starts must be between the minimum
time between start and stop, see section
between start/stop (4.2.1), and 3600/n, n being the set number of
starts per hour.
Setting range
1 to 1000 starts per hour.
Setting via the operating panel
• Settings > Pump cascade control > Max. number of starts/
hour.
1. Set:
• Min. time between start/stop.
• Max. number of starts/hour.
Factory setting
MPC-E: 200 starts per hour
Other variants: 100 starts per hour.
This function has no influence on
function (4.3.1).
8.7.14 Min. time
8.7.24 Stop