English (GB)
10
Maximum suction lift (continuous operation) for media with
maximum permissible viscosity
3.5 Sound pressure level
* Testing according to DIN 45635-01-KL3.
3.6 Electrical data
3.6.1 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.
3.6.2 Motor
Version: see motor and pump nameplates.
3.7 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 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.
3.7.1 Inputs and outputs
AR control unit factory settings
• Inputs and outputs: NO (normally open)
or
• inputs and outputs: NC (normally closed).
3.8 Power supply
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.
3.9 Ambient and operating conditions
• Permissible air humidity: max. relative humidity:
70 % at +40 °C, 90 % at +35 °C.
3.9.1 DMH with motor labelled for coolant temperature -20 °C
≤
T
amb
≤
40 °C
• Permissible ambient temperature: 0 °C (standard) to +40 °C
(for an installation height up to 1000 m above sea level)
• Pumps with minimum T
amb
-20 °C available on request
• Permissible storage temperature: -20 °C to +50 °C.
3.9.2 DMH with motor labelled for coolant temperature -20 °C
≤
T
amb
≤
55 °C and with dosing head material
stainless steel or PVDF
• Permissible ambient temperature: 0 °C (standard) to +55 °C
(for an installation height up to 1000 m above sea level)
• Pumps with minimum T
amb
-20 °C available on request
• Permissible storage temperature: -20 °C to +55 °C.
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
Observe the nameplate of the motor.
