Technical information

IM-P343-29 CH Issue 540
9.5.3 CTRLA - direct or reverse control action
Programming notes
Provides selection of direct (dIRCT) (4 - 20 mA) or reversed (REV) (20 - 4 mA)
valve positioning control action. Press
and keys to select desired action.
Default action is dIRCT.
Default values for travel limit settings (
MIN-T and MAX-T) and early shut-off
vent / inflate settings (
S-MIN and S-MAX) will depend on the valve type (2-port
or 3-port) and control action (direct or reverse) as follows:
DIR - direct action
Display 2-port 3-port
MIN-T 0% 0%
MAX-T 95% 100%
S-MIN 0.1% 0.1%
S-MAX OFF 0.1%
REV - reverse action
Display 2-port 3-port
MIN-T 0% 0%
MAX-T 95% 100%
S-MIN OFF 0.1%
S-MAX 0.1% 0.1%
Press key to accept the displayed action and advance to minimum travel
setting (MIN–T).
Commissioning notes
Selection of direct or reverse action changes the direct of valve plug movement relative
to the input signal. Refer to Figures 40 and 41, and the table shown in Figure 42 for further
guidance.
Valve plug position
Valve stem lifting
mA
Increasing input signal
Valve plug position
Valve stem falling
mA
Increasing input signal
Fig. 40 Direct action (DIR) Fig. 41 Reverse action (REV)