Grundfos DDI 209, Инструкция по установке и эксплуатации

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English (GB)
57
9.10 Flow Monitor
9.10.1 Application notes
Dosing of degassing media (H
2
O
2
, chlorine
bleaching agents)
• For a robust operation, set the number of
permissible error strokes to a value higher than
10.
Dosing of antiscalent (viscosity higher than
20 mPa s), in particular for DDI 0.4-10 with Plus
3
• Use spring-loaded valves for high-viscosity
media.
Dosing of viscous media
• For media with a viscosity higher than 20 mPa s,
spring-loaded suction and discharge valves are
recommended.
• Dosing media with a viscosity higher than
100 mPa s on request.
For batch or timer operation
• Set the number of permissible error strokes to a
value lower than the number of working strokes.
• If, while the pump is stopped, the pressure in the
discharge line falls below the minimum pressure
of 2 bar (e.g. in the event of a leak in the
pressure-loading valve), increase the number of
permissible error strokes so as to prevent
unnecessary error messages.
Ensuring the counter-pressure by a pressure-loading
valve:
•
Check the counter-pressure 2 to 3 weeks after
start-up.
– If it is below 2 bar, the pressure-loading valve
has to be re-adjusted.
– If the volume flow is not constant (as, for
example, in the case of contact or analog
control), even small volume flows should not
fall below the minimum pressure or minimum
pressure difference of 2 bar.
9.10.2 Setting the Flow Monitor
In order for the pressure sensor (if installed) to
function as a dosing controller, the dosing controller
must be switched on.
To allow the pump to switch off in the event of
overpressure and to set the cut-off pressure of the
pump, the pressure control function must be
switched on and set.
If no pressure sensor is connected, the pump
determines the pressure from the motor current.
Switching on dosing controller
Menu item "flow" is open.
•
"flow OFF" appears in the display.
1. Press the "Up" button.
– "flow ON" appears in the display.
– The dosing controller is activated.
Switching on pressure control function
1. Press the "Menu/Info" button.
– Menu item "P" is open.
– "P:OFF" appears in the display.
2. Press the "Up" button.
– "P:ON" appears in the display.
– The pressure control function is activated.
Set cut-off pressure
Fig. 56 Set cut-off pressure
Note
For applications with high
requirements in terms of precision, the
pressure control function must be used
with a pressure sensor.
Note
This menu item only appears if the
pressure sensor has already been
detected once.
TM
03
66
80
45
06
P:OFF
bar
Up
Down
10.0
Down
Up
P:OFF
P:on Stop
Start
6.0
Stop
Start
Menu
Info
Menu
Info
Menu
Info
bar
bar
bar
bar
Second function level