D0920 Arc-Detection Unit Rev. 0-D-070616
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3 INSTALLATION
3.1 D0920 Arc-Detection Unit
Outline and connection details are shown in Fig. 3. The D0920 can be DIN-rail mounted only. A
typical wiring diagram is shown in Fig. 4.
Connect supply voltage to terminals 5 (L1) and 6 (L2/N). The nominal supply voltage is 230 Vac.
Connect the 230/250 Vdc trip coil from a circuit breaker to terminals 7 (TRIP COIL +) and 8 (TRIP
COIL NEUTRAL). The trip coil output is not isolated from the 230 Vac supply input. To initiate an
external trip, install a normally-open momentary (250-Vac-rated) switch between terminals 4
(EXTERNAL TRIP) and 7 (TRIP COIL +). Limit the time the switch is closed to one second.
Do not install modules or sensors which have been damaged in transport.
NOTE: Dangerous voltage is present at the storage capacitor (terminals 4, 7, and 8) even after the
relay has been disconnected from the supply voltage. The capacitor has a self-discharge circuit
which will discharge it to a safe voltage level within two minutes after disconnection from the
supply voltage.
3.2 A0220 Point Sensor
Outline and connection details are shown in Fig. 5. Connect the red wire to terminal 1, the green
wire to terminal 2, and the shield to terminal 3. If more than one sensor is connected, do not mix
wire colors. Each sensor has an adhesive-backed drill template for surface-mount installation.
Place the drill template where the sensor is to be mounted. See Fig. 6.
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