4.2 Standard Configuration of Current Loop Input for Positioner Mod
The unit will respond to the current loop input when in REMOTE mode only (Refer to section 6.4).
The full control range in Positioner mode is 0-100%, corresponding to a Loop Input range of 5 to 19 mA.
Calibrate the current loop transmitter (usually an external PLC or Controller) according to the equations below.
If given a signal outside the 5-19 mA range, the Actuator will behave according to the response curves given in
Figure 4.2. Note that the actual operating stroke is dependent on configuration settings and valve type, Figure 4.2 shows
several common
configurations.
Current input (mA) = (0.0609 x Position required ( °CCW)) + 5
Current input (mA) = (0.1556 x Position required ( °CCW)) + 5
For the input current range of 5 to 19 mA and position of 0 to 100% of the maximum open position.
Curent input (mA) = (0.14 x Position required (%)) + 5
Position Calculation: % of Max Open Position
Position Calculation: 1/4 turn application in Degrees
Position Calculation: Emech F3 application in Degrees
Armstrong
International
221
Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
Phone (269) 279-3602 Toll Free (888) HOT-HOSE (468-4673)
Designs, materials, weights and performance ratings are
approximate and subject to change without notice. Visit
armstrong
international.com/emech for up-to-date information.