Grundfos AR - Current Signal Control 0-20 mA; 4-20 mA

English (GB)
17
8.6.5 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)
Fig. 23 Input signal: 0-20 mA
Fig. 24 Input signal: 4-20 mA
• The stroke frequency is proportional to a current input signal
of 0-20 mA (4-20 mA).
• Above 19.8 mA, the pump runs in continuous operation at
maximum stroke frequency.
• Below 0.2 (4.2) mA, the pump switches off.
• Use the "Start/Stop" button to start or stop the pump.
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.
Fig. 25 Display: current input signal < 2 mA
TM03 6368 4506TM03 6369 4506
Note
The pump must be started first in this operating
mode (LED lights up green, "Run" appears in the
display).
TM03 6370 4506
Analog
0-20mA
1/min
Run
0
Analog
1/min
Run
0
4-20mA
Analog
1/min
Run
0
ERROR
4-20mA