Publication 900-UM007D-EN-E - January 2011
Parameter Adjustments & Application Considerations
4-49
Parameters Related to Loop Break Alarms
➊
Set NONE as the unit for analog inputs.
• A loop break alarm can be output by setting the Alarm 1 Type to 12
(LBA).
• A setting of 12 (LBA) can be configured for Alarm 2 or 3 but the setting
will be disabled.
• Loop breaks are not detected during SP Ramp operation.
• Loop breaks are not detected during Auto-Tuning, Manual operation, or
while the controller is stopped.
• If the Alarm 1 Latch parameter is configured to ON, the latch will be
effective for the loop break alarm.
Automatically Setting the LBA Detection Time
• The LBA Detection Time is automatically configured by Auto-Tuning.
(However, it is not configured automatically for heating/cooling
control.)
• If the optimum LBA Detection Time is NOT obtained by Auto-Tuning,
configure the LBA Detection Time parameter (Advance Setting
function group).
Table 4.AB
Parameter Name
Symbol
Sensor Type
Configurable Range
(Units)
Application
Considerations
LBA Detection Time
lba
0…9999 (s)
Setting 0 disables the LBA
function.
LBA Level
lbal
Controllers with
Thermocouple and
Resistance Thermometer
(RTD) inputs
0.1…999.9 (
°
C/
°
F)
➊
Default: 8.0 (
°
C/
°
F)
Controllers with Analog
Inputs
0.01…99.99 (%FS)
Default: 10.00% FS
LBA Band
lbab
Controllers with
Thermocouple and
Resistance Thermometer
(RTD) inputs
0.0…999.9 (
°
C/
°
F)
➊
Default: 3.0 (
°
C/
°
F)
Controllers with Analog
Inputs
0.00…99.99 (%FS)
Default: 0.20% FS
Summary of Contents for Allen-Bradley 900-TC16
Page 1: ...USER MANUAL Bulletin 900 TC8 900 TC16 900 TC32 Series B Temperature Controllers...
Page 2: ...2...
Page 72: ...Publication 900 UM007D EN E January 2011 3 2 Configuration Basic Operation Figure 3 3 900 TC32...
Page 136: ...Publication 900 UM007D EN E January 2011 3 66 Configuration Basic Operation Notes...
Page 340: ...Publication 900 UM007D EN E January 2011 5 112 Parameter Functions Definitions Notes...
Page 350: ...Publication 900 UM007D EN E January 2011 6 10 Troubleshooting Error Indication Notes...
Page 406: ...Publication 900 UM007D EN E January 2011 D 8 Glossary Notes...