Operation; Description Of The Pump; Switching On/Off; Adjusting The Dosing Flow Via The Stroke Length - Grundfos DMX 226 Montage- Und Betriebsanleitung

8. Operation

In the event of a diaphragm leakage, the dosing
liquid may leak out of the hole in the intermediate
flange between the pump and the dosing head. The
parts inside the housing are protected from the
dosing liquid for a short time (depending on the type
Caution
of liquid) by the housing sealing. It is necessary to
check regularly (daily) if liquid is leaking out of the
intermediate flange. For maximum safety, we
recommend the pump version with diaphragm
leakage detection.

8.1 Description of the pump

7 4
5
6
Fig. 18 DMX 226
Pos. Components
1 Motor
2 Gears
3 Eccentric
4 Dosing diaphragm
5 Dosing head
6 Suction valve
7 Discharge valve
8 Stroke-length adjustment knob
9 AR control unit (optional)
10 Stroke sensor
Functional principle
• Reciprocating positive displacement pump with electric motor
and mechanical diaphragm control.
• The rotation of the motor is transformed into the reciprocating
movement of the dosing diaphragm by the eccentric and the
tappet.
• The dosing flow can be set by adjusting the stroke length of
the tappet.

8.2 Switching on/off

Before switching on the pump, check that it is
Caution
installed correctly. Refer to sections
and 7. Commissioning
• To start the pump, switch on the power supply.
• To stop the pump, switch off the power supply.
22
9
2
3
5. Installation
.
10

8.3 Adjusting the dosing flow via the stroke length

Adjust the stroke length only while the pump is
Caution
running!
• Slacken the locking screw (A) on the stroke-length adjustment
knob (8) a little using a screwdriver.
• To increase the dosing flow, turn the stroke-length adjustment
knob (8) slowly to the left until the desired dosing flow is
reached.
• To decrease the dosing flow, turn the stroke-length adjustment
knob (8) slowly to the right until the desired dosing flow is
reached.
• Gently retighten the locking screw (A) using a screwdriver.
5
6
0
0
7
0
8
0
9
0
100
%
Fig. 19 Stroke-length adjustment knob
1
8
4
0
3
0
2
0
1
0
0
8
A