English (GB)
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8.7.11 Setpoint ramp (4.1.9)
Fig. 51
Setpoint ramp
Description
When this function is enabled, setpoint changes will be affected
by the setpoint ramp, and the setpoint will change gradually over
a period of time.
"Proportional pressure" or "Setpoint influence" will not be affected
by this function.
Setting range
The function can be enabled and change per minute can be set.
Setting via control panel
• Settings > Primary controller > Setpoint ramp.
1. Select: Enabled.
2. Set: Change per minute.
Factory setting
The function is disabled.
8.7.12 Pump cascade control (4.2)
Fig. 52
Pump cascade control
It is possible to 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.
8.7.13 Min. time between start/stop (4.2.1)
Fig. 53
Min. time between start/stop
Description
This function ensures a delay between the starting/stopping of
one pump and the starting/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 control panel
Settings > Pump cascade control > Min. time between start/stop.
Factory setting
The setting is done in the start-up wizard and depends on the
application.
8.7.14 Max. number of starts/hour (4.2.1)
Fig. 54
Max. number of starts/hour
Description
This 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, the 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/stop, see section
, and 3600/n, n being
the set number of starts per hour.
