Operation; Description Of The Pump; Switching On/Off; Adjustment Of Dosing Flow Using A Frequency Converter - Grundfos DMX 227 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

Fig. 13 DMX 227
Pos. Components
1 Motor
2 Frequency converter
3 Worm wheel
4 Eccentric
5 Tappet
6 Support disk
7 Dosing diaphragm
8 Dosing head
9 Suction valve
10 Pressure valve
Functional principle
• Oscillating positive displacement pump with electric drive,
mechanical diaphragm deflection, and constant stroke length.
• Following reduction of the motor speed by a worm gear, the
rotation of the drive is converted into the suction and
compression movement of the diaphragm by means of an
eccentric and tappet. A defined volume (stroke volume) of the
dosed medium is thus sucked into the dosing head via the
suction valve, and displaced into the dosing line by the
discharge valve.
• The dosing flow can be adjusted in the range 1:10 if a
frequency converter is installed.
14

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.
8.3 Adjustment of dosing flow using a frequency
converter
The dosing rate can only be adjusted in the range 1:10 if a
frequency converter is installed. See installation and operating
instructions for the frequency converter!
Warning
Observe the manufacturer's instructions!
The connections must be carried out according to
these instructions.
Settings of frequency converter when used with Grundfos
dosing pumps
Pay special attention to the following parameters of the frequency
converter:
• P013 (maximum motor frequency):
– Set the frequency converter to maximum 100 Hz.
– Due to this setting, the maximum stroke frequency of the
pump cannot be exceeded.
• P086 (motor current limit):
– Do not change the default setting (150 %).
– The motor is protected by a PTC resistor. Therefore, this
parameter is not necessary.
• P081 - P085 (motor data):
– Set these parameters to the values stated on the motor
nameplate.
– Observe the manufacturer's instructions!

9. Operation with electronics

First refer to the general section
Caution
section only describes the additional functions.

9.1 Electronic diaphragm leakage sensor

9.1.1 Technical data
Model 230 V (+ 10 %/- 10 %)
Model 115 V (+ 10 %/- 10 %)
• Contact load: 250 V / 6 A, max. 550 VA
• Power consumption: 1.15 VA
• Enclosure class: IP65
• Permissible temperature range: 0 °C to +40 °C.
9.1.2 Dimensional sketch (electronics enclosure)
113.5
Fig. 14 Electronics enclosure
5. Installation
.
8. Operation . This
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