Emerson Autochangeover Controllers AC8 - Manual (Page 52)

System and Control Options
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7.5.9 Change Low Setpoint
When the sensor detects a condition below the Low Setpoint value, an
alarm or event will occur, depending on the sensor configuration.
The Low Setpoint value must not be set below the sensor’s 4 mA value
plus the offset value. For example, if the 4 mA value is 50°F and the
Offset value is 5°F, the Low Setpoint must be 55°F or higher.
The default Low Setpoint for each sensor is +0050.0. Values that can
be entered range from:
• the 4 mA value + the Offset value (in the example, 50+5=55)
to
• the 20 mA value + the Offset value (in the example, 90+5=95)
To view or change these values, see 7.5.4 - Change 4 mA Value,
7.5.5 - Change 20 mA Value and 7.5.6 - Change Offset Value.
To enter a new value:
• From the Setup Sensor Menu, choose Low Setpt for the selected
sensor and press Enter ↵ .
• To change the Low Setpoint:
• Use the arrows ↑↓ to choose a character.
• Press Enter ↵ to advance to the next character position.
• When finished, press Enter ↵ again.
7.5.10 Change High Setpoint
When the sensor detects a condition above the High Setpoint value, an
alarm or event will occur, depending on the sensor configuration.
The High Setpoint value must not be set above the sensor’s 20 mA value
plus the offset value. For example, if the 20 mA value is 90°F and the
Offset value is 5°F, the High Setpoint must be 95°F or lower.
The default High Setpoint for each sensor is +0090.0. Values that can
be entered range from:
• the 4 mA value + the Offset value (in the example, 50+5=55)
to
• the 20 mA value + the Offset value (in the example, 90+5=95)
To view or change these values, see 7.5.4 - Change 4 mA Value,
7.5.5 - Change 20 mA Value and 7.5.6 - Change Offset Value.
To enter a new value:
• From the Setup Sensor Menu, choose High Setpt for the selected
sensor and press Enter ↵ .
• To change the High Setpoint:
• 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: +050.0
20 mA: +090.0
OFFSET: +005.0
ALARM/EVENT: AL
LATCHED: N
> LOW SETPT: +0050.0
HIGH SETPT: +0090.0
SENSOR DELAY: 00:01
Change Low Setpoint
CHANGE LOW SETPOINT
LOW SETPT: +0060.0
↑↓
=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:
+005.0
ALARM/EVENT: AL
LATCHED: N
LOW SETPT: +0060.0
> HIGH SETPT: +0090.0
SENSOR DELAY: 00:01
Change High Setpoint
CHANGE HIGH SETPOINT
HIGH SETPT: +0085.0
↑↓
=SELECT
↵
=NEXT/END