18
11.3 Adjusting the dosing flow via the stroke length
• 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.
Fig. 17
Stroke-length adjustment knob
11.4 Stroke-length adjustment
The zero point (no dosing) of the dosing pump is factory-set to a
counter-pressure of 3 bar. See section
If the operating counter-pressure at the injection unit deviates
considerably from this value, it is advisable to readjust the zero
point to obtain more precise values.
1. Install a graduated tube at the suction valve.
– If such a tube is not available, insert the suction line into a
graduated measuring jug.
2. Start the dosing pump.
3. Set the dosing flow to 15 %.
4. For pumps with tank-empty indication, remove the electric plug
of the tank-empty indication.
5. Turn the adjustment knob slowly clockwise (towards the zero
point) until the medium level stops falling in the measuring jug
or tube.
6. Remove the plug with a small screwdriver without changing
the position of the adjustment knob and unscrew the cheese-
head screw together with the flat spiral spring.
7. Gently pull off the adjustment knob and fit it on the adjusting
spindle so that the zero line on the scale and the mark on the
adjustment knob coincide.
8. Screw in the cheese-head screw and the spiral spring until the
spring is preloaded, but does not block. Even when adjusted
to 100 %, the spring of the adjustment knob must remain
preloaded.
Fig. 18
Stroke-length adjustment
11.5 Adjustment of stroke rate using a frequency
converter
If a frequency converter is connected, the stroke rate can only be
adjusted in the range 10-100 % of max. stroke rate. See
installation and operating instructions for the frequency converter!
Settings of frequency converter when used with Grundfos
Alldos 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!
11.6 Using the AR control unit
When using the AR control unit, observe the installation and
operating instructions for "AR control unit" in addition to the
instructions in this manual.
12. Operation with other electronics
12.1 Electronics version stroke sensor
Pump type with inductive-proximity switch of two-wire design
according to NAMUR DIN 19234 for signalling the strokes.
The sensor can be installed in potentially explosive atmospheres
if PTB-approved isolating switching amplifiers with an intrinsically
safe control circuit [EExia] or [EExib] are connected. The sensor
can be used up to zone 1 depending on the isolating amplifier.
The specifications in the declaration of conformity for the isolating
amplifier must be observed.
Supply voltage U
B
: 7.7 to 10 V.
Caution
Adjust the stroke length only while the pump is
running!
T
M
03
63
09
45
06
Warning
Wear protective clothing (gloves and goggles)
when working on the dosing head, connections
or lines!
Caution
Adjust the stroke length only while the pump is
running!
TM
03 631
0 450
6
100%
90
80
70
60
50
40
30
20
10
0
8
Warning
Observe the manufacturer’s instructions!
The connections must be carried out according
to these instructions.
Caution
First refer to the general section
.
This section only describes the additional
functions.
Summary of Contents for DMX 115-3
Page 1: ...DMX 221 GRUNDFOS ALLDOS INSTRUCTIONS Installation and operating instructions ...
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