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Setpoint Lower Limit
The minimum allowable setpoint value. Adjustable within the scaled input
limits, but cannot be above the setpoint upper limit. Applies to local, remote
and profile setpoints.
Caution:
Set to safe values for the process. Operators can adjust
local setpoints to any value between the limits set.
Setpoint Upper Limit
The maximum allowable setpoint value. Adjustable within the scaled input
limits, but cannot be below the setpoint lower limit. Applies to local, remote
and profile setpoints.
Caution:
Set to safe values for the process. Operators can adjust
local setpoints to any value between the limits set.
Setpoint Ramp Rate
Setpoint Ramp Rate value, adjustable from 1 to 9999 display units per
hour, or OFF. The ramp is applied at power-up (from current PV to SP) and
whenever the setpoint value or source is changed. If set to OFF, the setpoint
steps immediately to the new setpoint value.
Main Setpoint Source
Select the source of the main setpoint. This can only be a “Local” setpoint
set from the keypad, or Not used.
Alternate Setpoint
Source
Select the source of the alternate setpoint. This can be a “Local” setpoint,
not used, or an analogue remote setpoint signal applied to input 2 or auxil-
iary input A – depending on available hardware.
Main Setpoint Value
Sets the current value of the main setpoint between the setpoint upper and
lower limits.
Alternate Setpoint Value
Sets the current value of the alternate setpoint between the setpoint upper
and lower limits.
Select Active Setpoint
Select if the main or alternate setpoint is to be the “active” setpoint for this
loop.
Main Setpoint Offset
An offset that can be added to the main setpoint (+ve values) or subtracted
from it (-ve values) when the instrument is a comms slave in a multi-zone ap-
plication. This changes the effective setpoint used for control.
Caution:
It should be set to zero if an offset is not required.
Alternate Setpoint Offset
An offset that can be added to the alternate setpoint (+ve values) or sub-
tracted from it (-ve values) when the instrument is a comms slave in a multi-
zone application. This changes the effective setpoint used for control.
Caution:
It should be set to zero if an offset is not required.
OUTPUTS CONFIGURATION SUB-MENU SCREENS
Output n Configuration - Up to 9 outputs listed. Any already used show as “Assigned” but can be changed.
If “Digital” is shown, the output is driven directly via a digital input (see input configuration). Relevant screen
sequences repeat for outputs fitted. Press
+
to return to Configuration Menu
Linear Output n Type
w
Set the desired type for any linear outputs fitted. From: 0-5, 0-10, 1-5, 2-10V
& 0-20, 4-20mA or 0-10VDC adjustable transmitter PSU.
Adjustable 0-10V
Transmitter PSU n
w
Sets the voltage required if linear output n type is 0-10VDC adjustable trans-
mitter PSU.
Output n Usage
w
Sets the use for the output. From: Loop 1 or 2 Primary / Secondary Power;
Logical OR or AND of Alarms & Profile Events (direct or reverse acting); Re-
transmission (of loop 1 or 2 effective setpoint, Input 1 or 2 process values).
Choices offered are appropriate for the output type fitted (e.g. only linear out-
puts can retransmit).
OPn OR Selection
w
When an output usage is set for logical OR alarms & profile events, this selects
the alarms or events to be OR’d. Press
or
to select
R
or deselect
c
Alarms 1 to 7; Events 1 to 5; PR (Profile running); PE (Profile Ended). Direct
outputs turn on, & reverse outputs turn off according to the selected logical
OR combination.
Summary of Contents for Chromalox 4081
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