Power Supply Connection; Relay Outputs - Grundfos Conex DIA-2 Installation And Operating Instructions Manual

Legend of terminals
Pos. Description
Relays Relay 1 + 2
Alarm relay
– N.O.: normally open
Alarm
– N.C.: normally closed
Pt100 Temperature sensor
H O Water sensor
2
Controller stop
Stop
(NO or NC selectable)
Outputs Current outputs [mA]
Cl (chlorine),
2
ClO (chlorine dioxide),
2
1
O (ozone) or
3
H O (hydrogen peroxide)
2 2
2 pH
T/P2: temperature / continuous
3
controller parameter 2
P1: output of continuous controller
4
parameter 1
Measuring cells, electrodes and
Electrodes
single-rod measuring chains
M Measuring electrode
B/R Reference electrode
G/C Counter electrode
Earth
mV pH electrode
Screen
Control panel enclosure Conex
®
• Conex DIA-2: for installation in the control panel.
• Sensor interface: for installation near the sensors.
18

10.2 Power supply connection

1. Control panel enclosure: Plug the plug strip into
2. Connect the protective earth conductor (PE) to
3. Connect the neutral conductor (N) (or the -
4. Connect phase (L1) (or the + conductor with 24 V
Switch the device on and off by switching the power
supply on and off accordingly. The device itself is not
equipped with a separate on/off switch.

10.3 Relay outputs

With inductive loads (also relays and contactors),
interference suppression is necessary. If this is not
possible, protect the relay contacts using a suppressor
circuit as described below.
•
®
DIA-2
•
Caution
the corresponding terminal strip at the rear side
of the device. Ensure correct orientation.
terminal 5 (wall-mounted enclosure) or terminal
8/1 (control panel enclosure).
conductor with 24 V version) to terminal 3
(wall-mounted enclosure) or terminal 8/2 (control
panel enclosure).
version) to terminal 1 (wall-mounted enclosure)
or 8/3 (control panel enclosure).
The connection of the relay outputs
depends on the application and the final
Note control elements used. Therefore the
connections described below should only
be considered as guidelines.
With AC voltage:
Current up to Capacitor C
60 mA 10 nF, 275 V
70 mA 47 nF, 275 V
150 mA 100 nF, 275 V
1.0 A 220 nF, 275 V
With DC voltage: Connect the free-wheeling
diode in parallel to relay or contactor.
Provide the relay outputs with a
corresponding backup fuse!
+
DC AC
-
Fig. 10 Suppressor circuit, DC/AC
Resistor R
390 Ω, 2 W
22 Ω, 2 W
47 Ω, 2 W
47 Ω, 2 W
R
C