Rittal CMC III Notice D'installation Et D'utilisation page 9

3.4 Operating conditions
The air flow sensor may only be operated under the following operating conditions:
Operating condition
Temperature operational range:
Humidity operational range:
Degree of protection:
4 Assembly
4.1 Assembly instructions
The assembly of the air flow sensor is made as shown in fig. 2, fig. 3, fig. 4 or fig. 5 and fig. 6.

When installing the sensor probe, ensure that no cables or other components can touch the tip of
the sensor probe. Otherwise there is a risk of damage due to the high temperature at the tip of the
sensor probe.
5 Installation and operation
5.1 Operating and display elements
The operating and display elements are shown in fig. 7.
Key for fig. 7
1 Multi-LED for the status display
2 CAN bus connection, 24 V
3 CAN bus connection, 24 V
4 Universal interface
5 Sensor element with cable
5.2 Installation

Connect the four colour-coded cables of the sensor element to the pins of the universal interface as
described below (fig. 7, item 4).
Pin Cable colour
Pin 1 White
Pin 2 Brown
Pin 3 Green
Pin 4 Silver

Lay the cable from the sensor to the measuring point.

Connect the air flow sensor with a CAN bus connection cable to the CMC III PU or to the neighbour-
ing elements on the CAN bus (fig. 7, item 2, 3).
Display of the status change:
– The two green and the two red CAN bus LEDs on the CAN bus connection flash.
– The multi-LED of the Processing Unit flashes continually in the green – orange – red sequence.
– The multi-LED of the air flow sensor flashes blue continuously.

Press the "C" key on the CMC III PU (a first audio signal is issued) and keep it pressed for approx.
3 seconds until a second audio signal is issued.
Display of the status change on the CAN bus LEDs:
– Green LEDs light continuously: CAN bus status "OK".
Rittal CMC III Analogue Air Flow Sensor
Product description, Assembly, Installation and operation
CMC III Analogue Air Flow Sensor
0 °C to +55 °C
5% to 95% relative humidity, non-condensing
IP 20 in accordance with IEC 60 529
Signal
+24 V
GND
4-20 mA input
4-20 mA GND
EN
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