West Control Solutions Pro-EC44 - Manual (Page 93)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 86
15 Setpoint Sources
The setpoint is the target value at which the instrument attempts to maintain the process
variable. Each loop can have a Main “local” setpoint set from the keypad and an Alternate
setpoint.
Loop 1 Setpoint Sources
Loop 1 can have a Main “local” setpoint set from the keypad and an Alternate setpoint.
The alternate setpoint source can be either another local Setpoint or a remote setpoint
(RSP), set by a mA or V DC signal applied to the 2nd input or to auxiliary input A. The control
loop
can only use one setpoint source at a time for each loop. This is called the “Active
Setpoint”. If the profiler option is fitted this provides the setpoint when the profiler is in use,
replacing both main an alternate setpoints.
Main/alternate setpoint selection can be made via a digital input; from the Control
Configuration menu or if enabled in the Display Configuration sub-menu, an operator screen
can be used to select the setpoint. The chosen setpoint selection method can be used to
permanently select one of the setpoints, or allow switching between them.
Refer to the Control Configuration Sub-Menu Screens on page 50 for setpoint settings.
Loop 1 Profile Setpoint
When in profile control mode, the selected profile always provides the active setpoint source
for loop 1 (see page 87). Once profile control mode is exited, the selected main or alternate
setpoint for loop 1 becomes active again.
Loop 2 Setpoint Sources
Loop 2 can have a
Main “local” setpoint set from the keypad and an Alternate setpoint.
The alternate setpoint source can be either another local Setpoint” or a remote setpoint
(RSP), set by a mA or V DC signal applied to auxiliary input A. The control loop can only use
one
setpoint source at a time for each loop. This is called the “Active Setpoint”. If the profiler
option is fitted this provides the setpoint, replacing both main an alternate setpoints, when 2-
loop profiling is in use.
Main/alternate setpoint selection can be made via a digital input; from the Control
Configuration menu or if enabled in the Display Configuration sub-menu, an operator screen
can be used to select the setpoint. The chosen setpoint selection method can be used to
permanently select one of the setpoints, or allow switching between them.
Refer to the Control Configuration Sub-Menu Screens on page 50 for setpoint settings.
Loop 2 Profile Setpoint
If the selected profile was configured to control the setpoint of both loops, it will provide the
active setpoint source (see page 87). Once profile control mode is exited, the selected main
or alternate setpoint for loop 2 becomes active again.