Resetting To Default Settings; Current Signal Control 0-20 Ma / 4-20 Ma - Grundfos DDI 222 Montage- Und Betriebsanleitung

9.8 Resetting to default settings

You can reset the first and second function levels to the default
settings when the power supply is being connected.
The service level settings (pump type, unit of display
for the dosing flow, input and output settings) and the
Note
values for the total dosing capacity and operating
hours counter remain as they are.
The pump is disconnected from the power supply.
1. Simultaneously press the "Up" and "Down" buttons and hold
them down.
2. Switch on the power supply.
– "boot" appears in the display.
3. Release the "Up" and "Down" buttons.
– All modified settings at the first and second function levels
are reset to the default settings.

9.9 Current signal control 0-20 mA / 4-20 mA

For controlling the dosing pump via an external current
signal of 0-20 mA (4-20 mA)
0-20m A
Run
Fig. 33 Display: 0-20 mA current signal control
2.50
4-20mA
Run
Fig. 34 Display: 4-20 mA current signal control
• The flow rate is proportional to a current input signal of
0-20 mA (4-20 mA).
• Above 19.5 mA, the pump runs in continuous operation at
maximum dosing flow (Q
max.
• Below 0.2 (4.2) mA, the pump switches off.
Default setting for Q
(default calibration value). Once the pump has been
calibrated, the current signals must be weighted. See
Note
sections 9.9.2 With calibrated pump
9.9.3 Setting the weighting
The pump must be started first in this operating
mode (LED lights up green and "Run" appears in the
Note
display).
• Use the "Start/Stop" button to start or stop the pump.
34
Analog
0
l/h
Analog
l/h
).
is the dosing flow up to 3 bar
max.
and
.
4-20 mA current signal control
If the current input signal falls below 2 mA, the error relay is
switched, as an error has probably occurred at the signal source
or on the cable.
• The error signal relay switches on. The LED flashes red.
• "4-20 mA" and "ERROR" flash in the display.
0.000
4-20mA
Run
ERROR
Fig. 35 Display: 4-20 mA current signal control
Analog
l/h