Grundfos Control MPC Montage- Und Betriebsanleitung Seite 71

8.6.69 Non-return valve (4.4.11)
Non-return valve
Description
The function enables CU 352 to detect if a Non-return valve
is leaking or faulty. A small leakage will after five accumulated
incidents result in a warning. A faulty NRV will instantly result in
an alarm and pump stop. In this case the motor is not able to
overcome the backflow through the pump with the faulty NRV.
The function is only valid for an MPC-E system with MGE
motors model G, H, I or J.
Setting range
• Monitoring, non-return valve: Enabled or Disabled.
• Automatic resetting of alarm: Enabled or Disabled.
Setting via the operating panel
• Settings > Monitoring functions > Non-return valve
1. Enable the function.
2. Select if Automatic resetting of alarm is to be Disabled.
Factory settings
The function is Enabled.
8.6.70 Controlled output 1-2 (4.4.13-4.4.14)
Controlled output 1-2
Description
With this function, CU 352 can monitor up to four different limits by
a set of indicators (switches and/or analog values) and can activate
a digital output. These four limits are Start, Stop, High and Low.
The reaction of the digital output depends on the monitoring type,
which can be Normal or Inverse. Inverse means that the function
of the indicators (switches and/or analog values) works opposite to
their function in Normal. For example, when Normal uses the Tank
filling application, Inverse uses the Tank emptying application.
Normal controlled output:
1. Low: If the level drops below the Low limit, a warning occurs
and activates the digital output Controlled output, Low and
simultaneously activates the digital output Controlled output, if
it is not activated beforehand.
2. Start: If the level drops below the Start limit, the digital output
Controlled output is activated.
3. Stop: If the level exceeds the Stop limit, the digital output
Controlled output is deactivated.
4. High: If the level exceeds the High limit, a warning occurs
and activates the digital output Controlled output, High and
simultaneously deactivates the digital output Controlled output,
if it is not deactivated beforehand.
Controlled output
Pos. Description
H High
2 Stop
1 Start
L Low
Inverse controlled output:
H
2
1
L
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