Setpoint Adjustments 4.11 - Partlow MIC 2000 Installation And Operation Manual

P 42
AGE
K e y
Actual Display
On/Off Display -
ON
Use arrow keys
OFF
to turn on or off
Scroll Key
Numeric Display -
Use arrow keys
to change value
Up Arrow Key
Down Arrow

Setpoint Adjustments 4.11

Local
Local setpoint adjustment is accomplished by using the keypad. Press the UP key to
increase the setpoint value. Press the DOWN key to decrease the setpoint value. Holding
the key pressed will cause the value to change slowly at first then increasingly faster. The
range of the setpoint value can be limited by selecting the setpoint upper limit SPL in the
Program mode. The setpoint value can be protected from inadvertent changes by
disabling the Setpoint Change, ESPC, in the Enable mode.
Ramp Rate - EB Option Only
A selectable Ramp Rate function can be used to limit the rate at which the setpoint used
by the control algorithm will change. This feature will also establish a soft startup. Upon
power up, the instrument will take the initial process value as the setpoint. A setpoint ramp
will be calculated to increase the setpoint from the initial process value to the setpoint
that was seen prior to the power outage.
Sudden changes in the setpoint value entered via the keypad can be inhibited from
effecting the control outputs by use of this feature. The internal setpoint used to control
the process will ramp to the setpoint value entered at the rate of change selected.
FIGURE 4-3
205
204
203
Setpoint
in
202
Degrees
201
200
Remote Setpoint
Remote Setpoint adjustment is an optional feature. The instrument setpoint can be
adjusted by supplying a signal to the remote setpoint terminals as indicated in the
installation section. Local or Remote setpoint operation is selected by pressing and
releasing the SCROLL key until the display reads setpoint select SPS. Press the DOWN
key to enter the Setpoint Select mode. The display will change to show the current
setpoint mode, either local loc or remote rSP. To change the setpoint mode press the
SCROLL key. To exit the setpoint mode press the UP key. To prevent unwanted setpoint
mode changes, the Setpoint Select mode can be disabled in the Enable mode. The
setpoint value can be adjusted by using the Digital Communcations Option. Refer to the
Protocol Manual (Form 2878) for more details about this option.
SETPOINT FLOW CHART
Setpoint Ramp
10
0 5
Time in Minutes
CtrL
SPS
LOC
rSP