Emerson Autochangeover Controllers AC8 - Manual (Page 50)

System and Control Options
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7.5.4 Change 4 mA Value
For the 4 mA value, enter the smallest value for the range of the sen-
sor—for example, 50°F for a temperature sensor with a range of 50°F
to 90°F.
The default value for each sensor is +045.0. Values that can be entered
range from -999.9 to +999.9.
To enter a new value:
• From the Setup Sensor Menu, choose 4 mA for the selected sensor
and press Enter ↵ .
• To change the 4 mA value:
• Use the arrows ↑↓ to choose a character.
• Press Enter ↵ to advance to the next character position.
• When finished, press Enter ↵ again.
7.5.5 Change 20 mA Value
For the 20 mA value, enter the largest value for the range of the sen-
sor—for example, 90°F for a temperature sensor with a range of 50°F
to 90°F.
The default value for each sensor is +096.0. Values that can be entered
range from -999.9 to +999.9.
To enter a new value:
• From the Setup Sensor Menu, choose 20 mA for the selected sen-
sor and press Enter ↵ .
• To change the 20 mA value:
• Use the arrows ↑↓ to choose a character.
• Press Enter ↵ to advance to the next character position.
• When finished, press Enter ↵ again.
7.5.6 Change Offset Value
For the Offset value, enter an adjustment factor—for example, if the
sensor reading shows 70°F when the actual temperature is 75°F, the
offset might be 5°F.
The default Offset value for each sensor is +000.0. Values that can be
entered range from -999.9 to +999.9.
To enter a new value:
• From the Setup Sensor Menu, choose Offset for the selected sensor
and press Enter ↵ .
• To change the Offset value:
• Use the arrows ↑↓ to choose a character.
• Press Enter ↵ to advance to the next character position.
• When finished, press Enter ↵ again.
Setup Sensor Menu
SETUP SENSOR_1
CONNECTED: Y
LABEL: ROOM_TMP
↑↓
=NEXT
↵
=SELECT
UNITS: DEG
> 4 mA: +045.0
20 mA: +096.0
OFFSET: +000.0
ALARM/EVENT: AL
LATCHED: N
LOW SETPT: +0050.0
HIGH SETPT: +0090.0
SENSOR DELAY: 00:01
Change 4 mA Value
CHANGE 4 mA VALUE
4 mA: +050.0
↑↓
=SELECT
↵
=NEXT/END
Setup Sensor Menu
SETUP SENSOR_1
CONNECTED: Y
LABEL: ROOM_TMP
↑↓
=NEXT
↵
=SELECT
UNITS: DEG
4 mA: +050.0
> 20 mA: +096.0
OFFSET: +000.0
ALARM/EVENT: AL
LATCHED: N
LOW SETPT: +0050.0
HIGH SETPT: +0090.0
SENSOR DELAY: 00:01
Change 20 mA Value
CHANGE 20 mA VALUE
20 mA: +090.0
↑↓
=SELECT
↵
=NEXT/END
Setup Sensor Menu
SETUP SENSOR_1
CONNECTED: Y
LABEL: ROOM_TMP
↑↓
=NEXT
↵
=SELECT
UNITS: DEG
4 mA: +050.0
20 mA: +090.0
> OFFSET: +000.0
ALARM/EVENT: AL
LATCHED: N
LOW SETPT: +0050.0
HIGH SETPT: +0090.0
SENSOR DELAY: 00:01
Change Offset Value
CHANGE OFFSET VALUE
OFFSET: +005.0
↑↓
=SELECT
↵
=NEXT/END