Publication 900-UM007D-EN-E - January 2011
3-26
Configuration & Basic Operation
The default is
onof
.
Hysteresis
In the ON/OFF control method, hysteresis is used to provide a
margin/differential for switching the control output ON when the controlled
temperature moves away from the required set point. The Hysteresis
parameter is used to give stability to the output around the set point.
The hysteresis value for HEAT control output and COOL control output
functions are configured in the Hysteresis (HEAT) and Hysteresis (COOL)
parameter functions respectively. In standard heating or cooling control, the
HEAT Hysteresis setting is used as the hysteresis setting (Adjustment function
group) regardless of the control mode, heating control or cooling control.
Figure 3.43 — Reverse Operation
3-Position Control
In the heating and cooling control method, a dead band (an area where both
control outputs are 0) can be configured for either the heating or cooling side
of the set point. This makes 3-position control possible.
Figure 3.44 — Reverse Operation with 3-Position Control
Set point
Heat Hysteresis
ON
OFF
PV
Set point
Hysteresis (OUT1)
Heating
side
Dead band
Hysteresis (OUT2)
Cooling
side
ON
OFF
PV
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...