Grundfos DMH 25 Series User Manual

11
Maximum suction lift (continuous operation) for media with
maximum permissible viscosity
6.5 Sound pressure level
* 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.
6.7.1 Inputs and outputs
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
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.
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
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.
Pump type
Maximum suction lift
[m WC]
DMH 251 Flooded suction
DMH 252 Flooded suction
DMH 253 Flooded suction
DMH 254 Flooded suction
DMH 255 Flooded suction
DMH 257 Flooded suction
Pump type
DMH 251 55 ± 5 dB(A)*
DMH 252 55 ± 5 dB(A)*
DMH 253 65 ± 5 dB(A)*
DMH 254 65 ± 5 dB(A)*
DMH 255 75 ± 5 dB(A)*
DMH 257 75 ± 5 dB(A)*
Inputs
Contact signal Maximum load: 12 V, 5 mA
Current 0-20 mA Maximum load: 22 Ω
Remote on/off Maximum load: 12 V, 5 mA
Two-stage tank-empty signal Maximum load: 12 V, 5 mA
Dosing controller and diaphragm leakage sensor
Outputs
Current 0-20 mA Maximum load: 350 Ω
Error signal
Maximum ohmic load:
50 VDC / 75 VAC, 0.5 A
Stroke signal Contact time/stroke: 200 ms
Pre-empty signal
Maximum ohmic load:
50 VDC / 75 VAC, 0.5 A
Rated voltage
Permissible deviation from rated
value
230 / 400 V ± 10 %
240 / 415 V ± 10 %
115 V ± 10 %
Caution
The installation site must be under cover!
Do not install outdoors!
Note
In the event of questions regarding the material
resistance and suitability of the pump for specific
dosing media, please contact Grundfos Alldos.

Grundfos DMH 25 Series Specifications

General

Brand	Grundfos
Model	DMH 25 Series
Category	Water Pump
Language	English