6. Control Applications - Master/Slave Arrangement
Revision 5
10260S HercuLine® Actuator Installation, Operation and Maintenance Manual
79
7/07
Master/Slave Arrangement
Introduction
With the motor positioner, the controlling signal for the actuator is a 4 mA to 20 mA from a current output
controller as shown in the flow diagram in Figure 25.
Unlike the position output controller, the current output controller must produce a continuous analog signal
or the actuator will revert to one of its failsafe states. Signal failure is not a problem since the available
failsafe settings allow you to set the actuator position on signal loss.
Basic Flow Control
When the process variable signal is below set point, the controller increases current (4 mA to 20 mA) to the
actuator input and opens the valve. Controller set point governs valve position to obtain desired flow rate.
PV
SP
4 to 20 mA
Controller
Positioner & Actuator
Linkage
Position
mA
Valve
Orifice Plate
FIC
MP
FT
Figure 25 Flow Diagram
Hot
10260S Series Actuator
Neutral
Ground
120/240
VAC
250 Ohms
1 to 5 VDC
+
-
Current Output Controller
4 to 20 mA
Figure 26 Interconnection Diagram
Содержание HercuLine 10260S
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