Mounting; Mounting On The Pump Terminal Box; Wall Mounting; Connecting Signal Lines For Ar Control Unit - Grundfos AR Serie Montage- Und Betriebsanleitung

6. Mounting

6.1 Mounting on the pump terminal box

The control unit is factory-mounted on the pump
terminal box by Grundfos!
Caution
At each intervention in the control unit, the e.s.d.
(electrostatic discharge) protection must be
observed!
General conditions:
• Pump with AC motor (Grundfos motor)
• Pump with Hall sensor (stroke indication)
• Pump types:
– DMX 221
– DMX 226 up to 400 l/h and 3.5 bar maximum
counter-pressure
– DMH.

6.2 Wall mounting

• Fasten the control unit to the wall by means of the enclosed
fastening material.
• Connect the power supply cable to a protective motor switch
(for size, see nameplate).
• Connect the control line.

7. Connecting signal lines for AR control unit

Warning
Electrical connections must only be carried out by
qualified personnel!
Disconnect the power supply before connecting the
power supply cable and the relay contacts!
Observe the local safety regulations!
Warning
The pump housing must only be opened by
personnel authorised by Grundfos!
Warning
Protect the cable connections and plugs against
corrosion and humidity.
Only remove the protective caps from the sockets
that are being used.
Warning
The enclosure class is only met if the sockets are
protected! The data regarding the enclosure class
applies to AR control units with correctly inserted
plugs or screwed-on caps.
The power supply must be electrically isolated from
Caution
the signal inputs and outputs.
There is a risk that the unit connected to the current
output could be destroyed!
If the pump connected to the current output has a
GND-PE reference, the current output may increase
Caution
to a multiple of 20 mA!
If this is the case, connect an isolating amplifier
between the current output and the unit.
10

7.1 Control data (AR control unit)

Functions for electronic control
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)
Dosing controller function (only with sensor - optional)
Diaphragm leakage detection (only with sensor - optional)
Access-code-protected settings
Remote on/off
Hall sensor (for motor monitoring)
Operating hours counter (cannot be reset)
Operating modes for electronic control
Manual
Stroke frequency: manually adjustable
Contact signal control
Multiplier (1:n) and divisor (n:1) (optional)
Current signal control 0-20 mA / 4-20 mA
Adjustment of stroke frequency proportional to the current signal
Weighting of current input
Inputs and outputs
Inputs
Maximum load: 12 V, 5 mA
Contact signal Minimum pulse length: 10 ms
Minimum pause time: 10 ms
Maximum load: 22 Ω
Current 0-20 mA
Remote on/off Maximum load: 12 V, 5 mA
Tank-empty signal Maximum load: 12 V, 5 mA
Dosing controller and diaphragm leakage sensor
Outputs
Maximum load: 350 Ω
Current 0-20 mA
Maximum ohmic load:
Error signal
50 VDC / 75 VAC, 0.5 A
Stroke signal Contact time/stroke: 200 ms
Maximum ohmic load:
Pre-empty signal
50 VDC / 75 VAC, 0.5 A