Grundfos CONTROL MPC, Инструкция по установке и эксплуатации

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8.7.21 Compensation for pump start-up time (4.2.10)
Fig. 62 Compensation for pump start-up time
Description
The function is used for MPC-F systems only.
The purpose is to avoid disturbances when a mains-operated
pump with fixed speed is started. The function compensates for
the time it takes a mains-operated pump to reach its full
performance after start. The start-up time of the mains-operated
pump must be known.
Setting via control panel
• Settings > Pump cascade control > Compensation for pump
start-up time.
• Set: Pump start-up time
Factory setting
The start-up time is set to 0 seconds.
8.7.22 Secondary functions (4.3)
Fig. 63 Secondary functions
Description
Functions that are secondary in relation to the normal operation
of the system can be set in this display. Secondary functions are
functions that offer additional functionality.
The display makes it possible to open these specific displays:
•
Stop function (4.3.1)
•
Soft pressure build-up (4.3.3)
•
Digital inputs (4.3.7)
•
Analog inputs (4.3.8)
•
Digital outputs (4.3.9)
•
Analog outputs (4.3.10)
•
Emergency run (4.3.5)
•
Min., max. and user-defined duty (4.3.14)
•
Pump curve data (4.3.19)
•
Flow estimation (4.3.23)
•
Control source (4.3.20)
•
Fixed inlet pressure (4.3.22)
•
Flow estimation (4.3.23)
•
Reduced operation (4.3.24)
.
8.7.23 Stop function (4.3.1)
Fig. 64 Stop function
Description
This function is typically used in constant pressure applications
and makes it possible to stop the last pump if there is no or a very
small consumption.
Purpose of the function:
• to save energy
• to prevent heating of shaft seal faces due to increased
mechanical friction as a result of reduced cooling by the
pumped liquid
• to prevent heating of the pumped liquid.