Emerson Autochangeover Controllers AC8 - Manual (Page 48)

System and Control Options
40
7.5 Setup System - Setup Sensor
The AC8 has four analog sensor input points that may be configured individually. The panel monitors
connected equipment for any 4-20 mA input—for example, temperature and humidity. Each sensor
input is dedicated to a specific zone:
• Sensor_1 is for Zone 1
• Sensor_2 is for Zone 2
• Sensor_3 is for Zone 3
• Sensor_4 is for Zone 4
To configure a sensor:
Log In and Choose Setup System
• From the Main Menu, use the arrows ↑↓ to choose System and
Control, then press Enter ↵ (see 7.1 - Login for help) .
• Enter your password at the Login screen.
• From the System and Control Menu, use the arrows
↑↓ to choose
Setup System, then press Enter ↵ .
Select a Sensor to Configure
• From the Setup System Menu, shown at right, use the arrows ↑↓ to
choose Setup Sensor and press Enter ↵ .
• From the Select Sensor Menu, choose the sensor you want—for
example, Sensor_1—and press Enter ↵ .
Table 17 shows sensor features that may be changed, along with the
default settings. By default, sensor inputs are not connected.
To activate a sensor input, you must specify it as connected and enter
corresponding values for 4 and 20 mA, as well as high and low set-
points. Other features that may be altered include the name of the sen-
sor, the abbreviation for the units, and defining the sensor as
alarmable or as an event.
• Alarmable sensors may be Latched (Y) or Unlatched (N).
• Event status allows you to monitor a sensor’s high and low setpoints—and use those setpoints to
change the status of an output, if desired—without triggering an alarm. Events are always
Unlatched.
• You may also specify a time delay before the AC8 responds to an alarm or event.
Use the steps following Table 17 to change the default settings for any analog sensor input.
Table 17
Default settings - analog sensor inputs
Feature Default Other Options
CONNECTED* N (Not connected)* Y (Connected)**
LABEL SENSOR_1 Any name (up to eight characters)
UNITS DEG Any units (up to three characters)
4 mA +045.0 Can define up to two decimal places—for example, -99.99
20 mA +096.0 Can define up to two decimal places—for example, +99.99
OFFSET +000.0 Can define up to two decimal places—for example, +00.00
ALARM/EVENT AL (Alarmable) EV (Event)
LATCHED N (Unlatched) Y (Latched)
LOW SETPT +0050.0 Can define up to two decimal places—for example, -999.99
HIGH SETPT +0090.0 Can define up to two decimal places—for example, +999.99
SENSOR DELAY 00:01 (1 second) Any time (in minutes and seconds) from 00:00 to 99:59
* If a sensor is configured as N (Not connected), the display will show an empty reading (blank spaces).
** If a sensor is configured as Y (Connected) and is functioning properly, the display will show a reading.
If the connected sensor is not functioning properly, the display will show dashes (------) indicating a problem.
Setup System Menu
SETUP INPUTS
SETUP COMMON ALARM
> SETUP SENSOR
↑↓
=NEXT
↵
=SELECT
SETUP ZONES
SETUP OUTPUTS
SETUP MODEM&PAGERS
SETUP SYSTEM INFO
SETUP OPERATION
SETUP I/O MATRIX
Select Sensor Menu
SELECT SENSOR
> SENSOR_1 +80.00 DEG
SENSOR_2 ------ DEG
↑↓
=NEXT
↵
=SELECT
SENSOR_3
SENSOR_4 +79.50 RH