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NE40E V800R010C10SPC500 Installation Guide

This is NE40E V800R010C10SPC500 Installation Guide
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
(Optional) Connecting Sensors to the CMU

(Optional) Connecting Sensors to the CMU

Introduction to the CMU

  • The central monitoring unit (CMU) monitors the internal environment of the cabinet (equipment room) and reports the results to the device management module through the MonitorBus.
  • The CMU provides two-level alarm output and reports the cabinet alarms in Boolean values to the central monitoring cabinet.
  • The CMU provides six major interface nodes for Boolean value detection, which can detect alarm information of external nodes.
  • CMU module reserved RS485 serial port, used to connect to other equipment, the current software version does not support.
Figure 9-24 CMU

CMU Front Panel

Figure 9-25 CMU front panel

The following table lists the components on the CMU front panel

No.

Component

Description

1

RUN (green)

  • If this indicator blinks quickly, the CMU is not working.
  • If this indicator blinks slowly, the CMU is working properly.

2

ALM (red)

A CMU fault occurs or related alarms are generated.

3

RS485

Serial port, 5 V, working in full-duplex mode

4

ANA1, AN12V

ANA2, AN12V

  • ANA1 and ANA2 connect to the "-" ends of temperature sensors (The input current ranges from 4 mA to 20 mA, and the input voltage ranges from 0 V to 2.5 V).
  • AN12Vs connects to the "+" ends of temperature sensors and provide 12 V voltage for the sensors.

5

FOG_IN, FOG12V

FOG_IN connects to the "-" end of a smoke sensor. FOG12V connects to the "+" end of the smoke sensor. FOG12V provides 12 V voltage for the smoke sensor.

6

COM1, OPEN1, CLOSE1

COM2, OPEN2, CLOSE2

These are ports for outputting two-level alarm signals. COM is a public port. OPEN is an always-open port. By default, OPEN is disconnected from COM. CLOSE is an always-closed port. By default, CLOSE is connected to COM. When an alarm is generated, OPEN is connected to COM, and CLOSE is disconnected from COM.

7

RE1+, RE1-

RE2+, RE2-

Connects to relays.

8

IN 1_IN 6

Six dry contact detection interfaces, which are used to detect external dry contact alarm information

9

GND

GND interface

Connecting Sensors to the CMU

  • Smoke sensor alarm detection

    Select a smoke sensor with the working voltage of 12 V. Connect the sensor to the CMU, as shown in Figure 9-26. FOG_12V and FOG_IN must be connected to the positive and negative poles of the sensor, respectively. The cable length cannot exceed 1.2 m.

    The sensor must be a Huawei smoke sensor whose BOM code is 33010293. In terms of technical specifications, the working voltage is 12 V DC, the working current is less than 50 uA, the alarm current ranges from 1 mA to 10 mA, the supported ambient temperature ranges from –10°C to 55°C, and the relative humidity is less than 95% (40°C without condensation).

  • Ambient temperature and humidity measurement

    Select a temperature and humidity sensor with the working voltage of 12 V. Connect the sensor to the CMU, as shown in Figure 9-26. AN12V and ANA1/ANA2 must be connected to the positive and negative poles of the sensor, respectively. The cable length cannot exceed 1.2 m.

    The sensor must be a Huawei temperature and humidity sensor whose BOM code is 33010286. In terms of technical specifications, the working voltage is 12 V DC, the output current ranges from 4 mA to 20 mA, the temperature measurement range is from –20°C to 80°C, the humidity measurement range is from 0% to 100%, and the precision is less than 5% (test condition: 25°C; humidity: 30%~80%).

    NOTE:
    The temperature and humidity curves corresponding to different voltage and current values vary according to the temperature and humidity sensor. The values displayed by non-Huawei sensors may be inaccurate.
  • Device alarm output

    The CMU provides two-level alarm output. You can report alarms of the cabinet where the CMU is located to the central monitoring cabinet in dry contact mode. Figure 9-27 shows relevant cable connections. If the central monitoring cabinet considers that no dry contact open-circuit alarm exists by default, connect OPENx and COMx to the dry contact detection end of the central monitoring cabinet. If the central monitoring cabinet considers that no dry contact closed-circuit alarm exists by default, connect CLOSEx and COMx to the dry contact detection end of the central monitoring cabinet. The cable length cannot exceed 2.5 m.

    NOTE:
    The current function is reserved only for hardware and not supported by software. Software design must be performed according to customer requirements.
  • Dry contact detection

    The CMU provides six dry contact alarm detection signal inputs for device monitoring outside the chassis.

    The CMU provides six dry contact detection channels, which can be used to detect external dry contact alarm information. Figure 9-28 shows relevant cable connections. The dry contact output signals of the cabinet are sent to the INx and GND interfaces of the CMU through cables. The cable length cannot exceed 2.5 m.

  • Relay output

    The CMU uses RE+ and RE- to control the working of the central monitoring cabinet.

  • One RS485 interface provided

    The CMU provides one RS485 interface, which is used to connect to devices with RS485 interfaces and supports the full-duplex mode. The cable length of the RS485 interface cannot exceed 10 m.

    NOTE:
    The CMU hardware has an RS485 serial port reserved for connecting to other external devices. The current software version does not support this port.
  • Select and configure sensors working in the voltage of 12 V.
  • The maximum through-current capacity of the relay is 1 A, which cannot exceed the limit.

The following figure shows connections between sensors and the CMU.

Figure 9-26 Connections between sensors and the CMU

Figure 9-27 Connecting sensors to the alarm detection interfaces of the CMU

Figure 9-28 Connecting sensors to the dry contact detection interfaces of the CMU

Figure 9-29 Connecting sensors to the relay output interfaces of the CMU

NOTE:

Cables connecting sensors to the CMU should be AWG28-16 (0.08 – 1.5 mm2).

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Updated: 2019-01-03

Document ID: EDOC1100055059

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