Interference Suppression Of Inductive Loads - Grundfos DMX 221 Installations- Und Bedienungsanleitung

1L
Fig. 11.1.3.2-1 Wiring diagram
Pos. Description
T1 Power connection
C1 Contact output 1
S1 Relay 1
C2 Contact output 2
S2 Relay 2
T2 Sensor connection
D2 Alarm LED (red)
D5 Sensor LED (red/
green)
13. Tighten the cable gland.
14. Fit the cover to the electronic unit and fasten it with the plastic screws.
Related information
• 11.1.3 Electrical connection

11.1.3.3 Interference suppression of inductive loads

• Inductive loads on the electronic unit for optical sensor will damage relays and contactors.
• Inductive loads on the electronic unit can be eliminated by means of a suppressor circuit as
the one described below.
Suppressor circuit DC or AC
+
DC
-
• With DC voltage, connect a free-wheeling diode parallel to the relay or the contactor.
• With AC voltage, choose capacitor and resistor corresponding to the input current:
ALARM
S1
2N 3PE 4PE 5N 6 7
REL 2
T1 C1
Terminals 1, 2, 3: 230 V AC / 115 V AC
Terminals 5, 6, 7: potential-loaded, 230 V AC / 115 V AC
Terminals 8, 9, 10: potential-free
Terminals GN (OUT / green), YE (+5 V / yellow), WH
(GND / white)
The LED lights up if a diaphragm leakage is detected.
The LED shows green light when the sensor is connected.
AC
R
C
ON
D2 D5
MBS
GND / white
+5V / yellow
T2
OUT / green
S2
8 9 10
C2
DMX 221 | | 53