Grundfos Control MPC Montage- Und Betriebsanleitung Seite 65

8.6.58 Pressure/level switch (4.4.1.1)
Pressure/level switch
Description
The function is primarily used in booster applications. Dry-running
protection can take place by means of a pressure switch on the inlet
manifold or a level switch in a tank on the inlet side.
When the contact is open, CU 352 registers water shortage after
a time delay of approximately 5 seconds. You can set whether the
indication is to be just a warning or an alarm stopping the pumps.
You can set restarting and resetting of alarms to be automatic or
manual.
Setting range
• Selection of digital input for the function.
• Reaction in case of water shortage: Alarm + stop.
• Restarting: Manual or Auto.
Setting via the operating panel
• Settings > Monitoring functions > Dry-running protection >
Pressure/level switch > Go to setting of digital input. Display
Digital inputs (4.3.7) appears.
1. Set the input to dry-running protection.
2. Press .
3. Select:
• Warning or Alarm + stop.
• Manual or Auto.
Factory settings
The setting is done in the startup wizard and depends on the
application.
Related information
8.6.28 Digital inputs (4.3.7)
8.6.59 Measurement, inlet pressure (4.4.1.2)
Measurement, inlet pressure
Description
Dry-running protection can take place by means of a pressure
transmitter measuring the inlet pressure.
You can set two levels:
• Warning
• Alarm + stop.
You can set restarting and resetting of alarms to be automatic or
manual.
Setting range
• Selection of analog input for the function.
• Inlet pressure level for Warning.
• Inlet pressure level for Alarm + stop.
• Restarting: Manual or Auto.
Setting via the operating panel
• Settings > Monitoring functions > Dry-running protection >
Measurement, inlet pressure> Go to setting of analog input.
Display Analog inputs (4.3.8) appears.
1. Select: Inlet pressure.
2. Press .
3. Select: Enabled.
4. Select and set the level:
• Warning.
• Alarm + stop.
5. Select resetting: Auto or Manual.
If one of the levels is not required, the level value must be
the minimum value of the inlet-pressure transmitter. This
disables the function.
Factory settings
The setting is done in the startup wizard and depends on the
application.
Related information
8.6.30 Analog inputs (4.3.8)
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