Grundfos DDA 7.5-16 User Manual

English (GB)
23
6.4 Operation modes
Six different operation modes can be set in the
"Setup > Operation mode" menu.
• Manual, see section 6.4.1
• Pulse, see section 6.4.2
• Analog 0-20mA, see section 6.4.3
Analog 4-20mA, see section 6.4.3
• Batch (pulse-based), see section 6.4.4
• Dosing timer cycle, see section 6.4.5
• Dosing timer week, see section 6.4.6
6.4.1 Manual
In this operation mode, the pump constantly
doses the dosing flow set with the click wheel.
The dosing flow is set in l/h or ml/h in the "Operation"
menu. The pump automatically switches between the
units. Alternatively, the display can be reset to US
units (gph). See section 6.13 Display Setup.
Fig. 15 Manual mode
The setting range depends on the pump type:
* When the "SlowMode" function is active, the
maximum dosing flow is reduced, see section
3.1 Technical data.
6.4.2 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.
Fig. 16 Pulse mode
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:
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.
The contents of the memory will be deleted by:
• Switching off the power supply
• Changing the operation mode
• Interruption (e.g. alarm, External stop).
TM04 1125 1110
Type
Setting range*
[l/h] [gph]
DDA 7.5-16 0.0025 - 7.5 0.0007 - 2.0
DDA 12-10 0.012 - 12 0.0031 - 3.1
DDA 17-7 0.017 - 17 0.0045 - 4.5
DDA 30-4 0.03 - 30 0.0080 - 8.0
Operation
3.40
l/h
Manual 3.40l/h
TM04 1126 1110
Type Setting range [ml/pulse]
DDA 7.5-16 0.0015 - 14.9
DDA 12-10 0.0029 - 29.0
DDA 17-7 0.0031 - 31.0
DDA 30-4 0.0062 - 62.0
Warning
Subsequent processing of saved
pulses can cause local increase in
concentration!
Operation
0.0400
ml/
Pulse 3.40l/h

Grundfos DDA 7.5-16 Specifications

General

Max Flow Rate	7.5 l/h
Max Pressure	16 bar
Protection Class	IP65
Operating Temperature	0°C to +45°C
Analogue Control	4-20 mA
Pulse Control	Yes
Level Control	Yes
Power Supply	100-240 V, 50/60 Hz
Material	Stainless Steel