Pulse; Analog 0/4-20 Ma - Grundfos SMART Digital XL DDA 60-10 Installation And Operating Instructions Manual

7.4.2 Pulse

In this operation mode, the pump doses the
set dosing volume for each incoming (potential-free)
pulse, e.g. from a water meter. The pump
automatically calculates the optimum stroke
frequency for dosing the set volume per pulse.
The calculation is based on:
• the frequency of external pulses
• the set dosing volume/pulse.
Operation
18.4
Pulse
Pulse mode
Fig. 19
The dosing volume per pulse is set in ml/pulse in the
"Operation" menu using the click wheel. The setting
range for the dosing volume depends on the pump
type:
Type Setting range [ml/pulse]
DDA 60-10
DDA 120-7
DDA 200-4
The frequency of incoming pulses is multiplied by the
set dosing volume. If the pump receives more pulses
than it can process at the maximum dosing flow, it
runs at the maximum stroke frequency in continuous
operation. Excess pulses will be ignored if the
memory function is not enabled.
Memory function
When the "Setup > Pulse memory" function is
enabled, up to 65,000 unprocessed pulses can be
saved for subsequent processing.
Subsequent processing of saved pulses
can cause local increase in concentration!
The contents of the memory will be deleted by:
• Switching off the power supply
• Changing the operation mode
Interruption (e.g. alarm, External stop).
•
26
ml/
6.62l/h
0.0111 - 111
0.0232 - 232
0.0386 - 386

7.4.3 Analog 0/4-20 mA

In this operation mode, the pump doses
according to the external analog signal. The
dosing volume is proportional to the signal input
value in mA.
Operation Input value
mode [mA]
≤ 4.1
4-20 mA
≥ 19.8
≤ 0.1
0-20 mA
≥ 19.8
If the input value exceeds 22 mA, an alarm is
displayed and the pump stops dosing. If the input
value in operation mode 4-20 mA falls below 2 mA,
an alarm is displayed and the pump stops dosing.
The "Sensor signal" alarm symbol is displayed in the
"Signal and error display" area of the display.
Q [%]
100
80
60
40
20
0
0 4 8
Fig. 20 Analog scaling
Operation
51.4
0-20mA
Fig. 21 Analog operation mode
Dosing flow
[%]
0
100
0
100
12 16 20 [mA]
l/h
17.14mA