IMP PUMPS NMT Max C - Control Modes and Priorities; Priority of Settings

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4. CONTROL MODES AND PRIORITIES
4.1. PRIORITY OF SETTINGS
Several signals will influence the pump operation. For this reason, settings have priorities as shown in the table
below. If two or more functions are active at the same time, the one with highest priority will take precedence.
Priority
Pump control panel &
Ethernet settings
External signals
1
Modbus control
1
Stop (OFF)
2
Night mode active
2
3
Max. RPM (Hi)
4
Min. curve
4
5
Stop (Run not active)
6
Max. curve
4
Stop
3
7
Set point setting
4
Set point setting
3
8
Set point setting
4
Examples:
• Stop on the pump display panel will stop the pump, regardless of external set point.
• If External Run input is inactive, the pump cannot be started over Modbus, but can be set to max RPM on
the display panel.
4.2. CONTROL VARIABLES
Pump will respond to external controls according to selected pump operating mode. Consult proper pump
operating manual for explanation.
Symbol
Regulation mode
Module set point controls:
Auto mode
-
(RUN only)
Proportional pressure
Maximum head
Constant pressure
Maximum head
Constant speed
Speed
(RPM)
Combined
5
-
(Web interface only)
Night mode
6
-
(RUN only)
1
Not all inputs are available in all modes.
2
External and Modbus Stop signals become active in night mode. Due to possible confusion, use of night mode
is discouraged while using external control.
3
Only available when pump is bus controlled.
4
Not available when pump is bus controlled.
5
Multiple limits can be set. Not available on all pumps.
6
Night mode is not independent regulation mode.