Sound Pressure Level; Electrical Data; Ar Control Unit; Required Energy - Grundfos DMH 251 Installation And Operating Instructions Manual

Maximum suction lift (continuous operation) for media with
maximum permissible viscosity
Pump type
DMH 251
DMH 252
DMH 253
DMH 254
DMH 255
DMH 257

6.5 Sound pressure level

Pump type
DMH 251
DMH 252
DMH 253
DMH 254
DMH 255
DMH 257
* Testing according to DIN 45635-01-KL3.

6.6 Electrical data

6.6.1 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.
6.6.2 Motor
Version: see motor and pump nameplates.

6.7 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 Alldos 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.
Maximum suction lift
[m WC]
Flooded suction
Flooded suction
Flooded suction
Flooded suction
Flooded suction
Flooded suction
55 ± 5 dB(A)*
55 ± 5 dB(A)*
65 ± 5 dB(A)*
65 ± 5 dB(A)*
75 ± 5 dB(A)*
75 ± 5 dB(A)*
6.7.1 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
Current 0-20 mA
Error signal
Stroke signal
Pre-empty signal
AR control unit factory settings
• Inputs and outputs: NO (normally open)
or
• inputs and outputs: NC (normally closed).

6.8 Required energy

Power supply for AC voltage
Rated voltage
230 / 400 V
240 / 415 V
115 V
Maximum permissible mains impedance
(0.084 + j 0.084) Ohm (testing according to DIN EN 61000-3-11).
These details apply to 50 Hz.

6.9 Ambient and operating conditions

• Permissible ambient temperature: 0 °C to +40 °C
(for an installation height up to 1000 m above sea level).
• Permissible storage temperature: –20 °C to +50 °C.
• Permissible air humidity: max. relative humidity:
70 % at +40 °C, 90 % at +35 °C.
The installation site must be under cover!
Caution
Do not install outdoors!
Pumps with AR control unit only
Maximum permissible mains impedance: 0.084 + j 0.084 Ω
(testing according to EN 61000-3-11).

6.10 Dosing medium

In the event of questions regarding the material
resistance and suitability of the pump for specific
Note
dosing media, please contact Grundfos Alldos.
The dosing medium must have the following basic characteristics
for the standard pumps:
• liquid
• non-abrasive
The dosing of abrasive media is possible with certain versions,
on request.
• non-inflammable
The dosing of inflammable media is possible with certain
versions of explosion-proof pumps, in accordance with ATEX.
Maximum load: 12 V, 5 mA
Maximum load: 22 Ω
Maximum load: 12 V, 5 mA
Maximum load: 12 V, 5 mA
Maximum load: 350 Ω
Maximum ohmic load:
50 VDC / 75 VAC, 0.5 A
Contact time/stroke: 200 ms
Maximum ohmic load:
50 VDC / 75 VAC, 0.5 A
Permissible deviation from rated
value
± 10 %
± 10 %
± 10 %
11