24
Installation MACH4002
Release 16 03/2021
Figure 4: Fan supply plug-in unit M4-AIR: Side view and front view
1.4.2
Monitoring temperature and fan
Fan monitoring
Every individual fan sends a speed-dependent signal to the basic system.
The fan monitoring displays the failure of one or more individual fans.
The effect of insufficient ventilation
If the device is insufficiently ventilated by its fans, this either causes the
assemblies to age faster (MTBF value) or triggers error statuses, and it
usually leads to transmission errors on the Ethernet connections.
Temperature difference
The difference between the ambient temperature and the circuit board
(PCB) temperature is primarily independent of the ambient
temperature:
MACH4002 device
Temperature difference
Ambient to PCB with all fans
at full speed
Temperature difference
Ambient to PCB with all fans
at half speed
MACH4002-24G/48G
+20 K
+27 K
Table 7:
Temperature difference ambient - PCB at full and half fan speed
P
P1
P2
P3
P4
RM
RL1
RL2
FAN
RUN
L/D
FDX
1000
AN
TP/FO
RING
PORT STBY
LED
TEST
PoE
1
1
2
3
4
LED
MEDIA SLOTS
M4-AIR
SLOT.PORT
M4-AIR
Summary of Contents for Hirschmann MACH4002 Series
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