4-6
<Toc> <Ind>
TI 05C01E02-01E 1st Edition : Oct. 31, 2001-00
4.2.2 Switching Direct / Reverse Action
Direct and reverse action define the direction in which output increase or decrease,
according to whether deviation of target setpoint (SP) and measured input vb0}e (PV) is
positive or negative. Reverse action is used for temperature control in a heating con-
trol, and direct action for cooling control. Factory set to Reverse action.
Direct/reverse switching is unavailable in heating/cooling control.
Condition
ON/OFF output status
Current output
Time proportional output
Direction of
change in
control output
PV > SP
OFF
Decreases.
The ON-state time decreases.
Reverse Action ( DR = 0 )
Direct Action ( DR = 1 )
Reverse Action
SP value
Output
value
( Increase )
( Decrease )
Minimum
( PV value is smaller )
Maximum
( PV value is greater )
4mA PV value
20mA
Direct Action
PV < SP
ON
Increases.
The ON-state time increases.
PV > SP
ON
Increases.
The ON-state time increases.
PV < SP
OFF
Decreases.
The ON-state time decreases.
SP value
Output
value
( Increase )
( Decrease )
Minimum
( PV value is smaller )
Maximum
( PV value is greater )
4mA
20mA
PV value
Step 1:
Bring the operating display into view.
UT130
Display example
UT150/UT152/UT155
Display example
Step 2:
Press the key for 3 seconds or more to display
the parameter "A1".
The parameter "A1" appears only for the controller
with the "/AL" or" /HBA" option.
The parameter "CTL" appears for the controller
without the "/AL" or" /HBA" option
Step 3:
Press the key several times to display the
parameter "LOC".
Set "-1" to enter the setup parameter
setting display. But if "LOC" = 1 or 2 is
already set, the parameter value can not
be changed by setting "LOC" = -1 only. To
change the parameter value, set "LOC" = 0
at first (for disabling key lock), then set
"LOC" = -1 once again
NOTE
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