Noran Tel
Page 8 of 16
a subsidiary of Westell, Inc
4. Analog Inputs (4)
This menu allows a user to view the current
physical analog input value and event state and
to access the analog input configuration menu.
Analog Input 7 is dedicated to an internal
temperature sensor in the SiteVu. Figure 4-1
shows an example of the analog input menu
screen.
Figure 4-1 Analog Inputs Menu
The user can configure a sensor by typing the
number of sensor and pressing the <Enter>
key. The following sections discuss configuring
the analog inputs.
4.1 Analog Input Configuration Menu
Each analog input can be configured with the
following options as seen in Figure 4-2.
Figure 4-2 Analog Input Configuration Menu
The
Sensor Name
field can be up to 16
characters. This name will be used when
referring to the sensor in the Log Viewer menu,
SNMP Traps, etc.
The
Range, Multiplier, Offset and Unit
menu
items allow the user to convert the analog input
voltage to a friendly readable value such as
temperature, current, percentage, etc. The
voltage ranges available include:
•
0-125mV
•
0-5V
•
0-60V
Example 1:
•
A user has a 0-400A shunt sensor that
outputs a voltage between 0-50mV.
Rather than displaying a voltage, and
using alarm points in the mV range the
value can be converted to Amperes
instead.
o
Multiplier = 400A/50mV = 8000
o
Range = 0-125mV
o
Offset = 0
o
Units = A (for Amperes)
Example 2:
•
A user has a temperature sensor that
outputs 0-5V. The voltage is converted
to Kelvin when it is multiplied by 100.
•
F = ((K-273.15)*1.8)+32
•
F = ((100*Value-273.15)*1.8+32
•
F = 180*value-491.67+32
•
F = 180*value + (-459.67)
Therefore the settings would be:
o
Multiplier
180
o
Range = 0-5V
o
Offset = -459.67
o
Units = Fah (for Fahrenheit
The
Low Alarm and High Alarm
menu items are
used to enable an alarm when the analog
voltage drops below a certain levels or rises
above a certain level.
The
Send SNMP Trap
menu item can be
enabled to allow the SiteVu to send out SNMP
Traps to configured SNMP Trap recipients
when a low or high alarm event occurs.
The
Low Alarm Point and High Alarm Point
menu items allow the user to define the levels
at which an alarm state is occurring.
The
Return Point menu items
are used to
define when the alarm state returns to a normal
state. The Low alarm return point must be
higher than the low alarm point and the high
return point must be lower than the high alarm
point. Refer to the Analog Input sensor section
in the hardware manual for more detailed
information.
