Burner Control/Flame Safety
Split Range
26
HercuLine™ 2000 Series Actuator - Installation, Operation and Maintenance Manual
Revision 7
7/08
Split Range
The HercuLine
®
2001/2002 actuators can be set up to operate within a narrow input range (for example,
4 to 12mA input) in certain applications. The procedure in Table 5 describes how to set up an actuator
to operate as part of a split valve configuration.
Table 5 Split Range Set Up Procedure
Step
Action
To Set Actuator span to operate from 4 to 12 mA input.
1
Enter Set Up mode by pressing SET UP key
2
Select SET INPUT group
3
Press FUNCTION key until INP HI (on lower display) is selected.
4
Set INP HI value to 50.0
5
Press FUNCTION key to select INP LO and set value to 0.0
6
Press DISPLAY key to exit Set Up mode.
To Set Actuator span to operate from 12 to 20 mA input.
1
Enter Set Up mode by pressing SET UP key
2
Select SET INPUT group
3
Press FUNCTION key until INP HI (on lower display) is selected.
4
Set INP HI value to 100.0
5
Press FUNCTION key to select INP LO and set value to 50.0
6
Press DISPLAY key to exit Set Up mode.
ATTENTION
Be sure to review failsafe strategy for your process application.
Master/Slave Arrangement
Introduction
With the motor positioner, the controlling signal for the actuator is a 4 to 20mA from a current output
controller as shown in the flow diagram in Figure 16.
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.