Grundfos CONTROL MPC User Manual

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11.7.11 Pump cascade control (4.2)
Fig. 46 Pump cascade control
In this menu section, 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.
11.7.12 Min. time between start/stop (4.2.1)
Fig. 47 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
1. Mark the Settings menu with .
2. Mark Pump cascade control with or , and press
.
3. Mark Min. time between start/stop with or , and
press .
4. Set the required minimum time with or , and save
with .
Factory setting
The setting is done in the start-up wizard and depends on the
application.
11.7.13 Max. number of starts/hour (4.2.1)
Fig. 48 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 351 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 11.7.12, and 3600/n, n being
the set number of starts per hour.
Setting range
1 to 1000 starts per hour.
Setting via control panel
1. Mark the Settings menu with .
2. Mark Pump cascade control with or , and press
.
3. Mark Max. number of starts/hour with or , and press
.
4. Set the permissible number of starts per hour with or
, and save with .
Factory setting
TM03 8962 4807TM03 2367 4607
TM03 2367 4607
Control MPC-E: 200 starts per hour
Other variants: 100 starts per hour
Note
This function has no influence on Stop function
(4.3.1).

Grundfos CONTROL MPC Specifications

General

Brand	Grundfos
Model	CONTROL MPC
Category	Control Systems
Language	English