Vaisala vNet PoE Network Interface - Manual (Page 28)

22 VAISALA
Setting the System Fan
Some vNet Devices are equipped with an internal fan. This fan is
provided to cool the internal electronics so they do not affect data
logger measurements. If the Logger connected to your vNet
Device does not include any internal measurement Channels, you
may be able to turn the fan off if this option is supported by the
vNet Device model (if available, this option displays on the Power
Settings screen). By default, the fan is turned ON.
Note:
If your vNet Device is powered using Power over
Ethernet, the fan must be turned ON. The Power over
Ethernet (PoE) standard requires that a minimum
amount of load current be drawn from the supply; the
fan provides this minimum load.
To turn the system fan on or off:
1
From the vNet Configuration and Management interface,
choose
Management | Power
.
2
In the
Power Settings
screen, use the drop-down list to select
On
or
Off
for the
Fan Setting
option.
3
Click
Apply
.
15V Loop Power Excitation
The vNet Device may include a 15V loop power output, which
allows you to provide power to a sensor or transducer connected
to a Vaisala Veriteq Logger recording 4-20 mA currents or DC
voltage signals.
If your vNet device is equipped with this feature, the option to
enable or disable loop power displays on your screen.
To enable or disable 15V Loop Power Excitation:
1
From the vNet Configuration and Management interface,
choose
Management | Power
.
2
In the
Power Settings
screen, check or uncheck the
Enable
15V Loop Power Excitation
checkbox to enable or disable loop
power.
3
Click
Apply
.