Ambient And Operating Conditions; Dosing Medium; Electrical Data; Ar Control Unit - Grundfos DMX 226 Montage- Und Betriebsanleitung

3.6 Ambient and operating conditions

• Permissible ambient temperature: 0 °C to +40 °C.
• Permissible storage temperature: -20 °C to +50 °C.
• Permissible air humidity: max. relative humidity
(non-condensing): 70 % at +40 °C, 90 % at +35 °C.
The installation site must be under cover!
Ensure that the enclosure class of motor and pump
are not affected by the atmospheric conditions.
Caution
Pumps with electronics are only suitable for indoor
use! Do not install outdoors!
Warning
Risk of hot surfaces!
Pumps with AC motors may become hot.
Allow a minimum space of 100 mm above the fan
cover!
• Sound pressure level: ± 55 dB(A), testing according to
DIN 45635-01-KL3
• Minimum counterpressure: 1 bar at the pump discharge valve.
Pay attention to the pressure losses along the way to the
injection point inclusively.
Pumps with AR control unit only
Maximum permissible mains impedance: 0.084 + j 0.084 Ω
(testing according to EN 61000-3-11).

3.7 Dosing medium

In the event of questions regarding the material
Caution
resistance and suitability of the pump for specific
dosing media, please contact Grundfos.
The dosing medium must have the following basic characteristics:
• liquid
• non-abrasive
• non-flammable.
3.7.1 Permissible media temperature
Dosing head material
PVC
Stainless steel*
PP
PVDF
* For SIP/CIP applications (not with ATEX): A temperature of
145 °C at a counterpressure of max. 2 bar is permitted for a
short period (15 minutes).
Observe the freezing and boiling points of the dosing
Caution
medium!

3.8 Electrical data

3.8.1 Enclosure class
The enclosure class depends on the motor variant selected,
see motor nameplate.
The specified enclosure class can only be ensured if the power
supply cable is connected with the same degree of protection.
Pumps with electronics: The enclosure class is only met if the
sockets are protected! The data regarding the enclosure class
applies to pumps with correctly inserted plugs or screwed-on
caps.
3.8.2 Motor
Version: see motor and pump nameplates.
Temperature range
p < 10 bar
0 °C to +40 °C
-10 °C to +70 °C
0 °C to +40 °C
-10 °C to +60 °C
+70 °C at 9 bar

3.9 AR control unit

Functions of pumps with electronics:
• "Continuous operation" button for function test and dosing
head deaeration
• memory function (stores a maximum of 65,000 pulses)
• two-stage tank-empty signal (e.g. via Grundfos tank empty
sensor)
• stroke signal/pre-empty signal (adjustable), e.g. as a feedback
to the control room
• dosing controller function (only with sensor - optional)
• diaphragm leakage detection (only with sensor - optional)
• access-code-protected settings
• remote on/off
• hall sensor
• operating hours counter
• motor monitoring.
Operating modes:
• manual
Stroke frequency: manually adjustable between zero and
maximum
• contact signal control
Multiplier (1:n) and divisor (n:1)
• current signal control 0-20 mA / 4-20 mA
Adjustment of stroke frequency proportional to the current
signal.
Weighting of current input.
3.9.1 Inputs and outputs
Inputs
Contact signal
Current 0-20 mA
Remote on/off
Two-stage tank-empty signal
Dosing controller and diaphragm leakage sensor
Outputs
Maximum load: 350 Ω
Current 0-20 mA
Maximum ohmic load: 50 VDC / 75 VAC, 0.5
Error signal
A
Stroke signal Contact time/stroke: 200 ms
Maximum ohmic load: 50 VDC / 75 VAC, 0.5
Pre-empty signal
A
AR control unit factory settings
• Inputs and outputs: NO (normally open)
or
• inputs and outputs: NC (normally closed).

3.10 Materials

Pump
• Pump housing: Al 226
• Diaphragm flanges: GG 25
• Stroke-length adjustment knob: ABS.
AR control unit enclosure
• Upper part of enclosure: PPO blend
• Lower part of enclosure: aluminium.
Optoelectronic diaphragm sensor
• Housing: ABS.
Maximum load: 12 V, 5 mA
Maximum load: 22 Ω
Maximum load: 12 V, 5 mA
Maximum load: 12 V, 5 mA
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