
P
AGE
38
Operation 4.1
4.1.1 OFF MODE
In the Off Mode, the instrument control, process retransmission signal(s) and alarm
function(s) are turned off. The Off mode can be entered by pressing and releasing the
SCROLL key until the display reads oFF, then pressing the DOWN key. The display will read
oFF and then the current process variable at two second intervals. This sequence will repeat
to indicate that the instrument is in the Off mode.
4.1.2 CONTROL MODE
In the Control mode, the instrument control function(s) and alarm(s) are actively responding
to the process variable as selected in the Program and Tune modes. The control mode
allows setpoint changes from local setpoint (standard) adjustment by an operator at the front
keypad. Other operations in the Control mode include a lamp test and proportional output %
display.
4.1.2.1 DIRECT/REVERSE OPERATION OF OUTPUTS
Direct operation is typically used with cooling applications. On-Off direct output(s) will turn on
when the process variable exceeds setpoint. Proportional direct output(s) will increase the
precentage of output as the process value increases within the proportional band.
Reverse operation is typically used with heating applications. On-Off reverse output(s) will
turn off when the process variable exceeds setpoint. Proportional reverse output(s) will
decrease the percentage of output as the process value increases within the proportional
band.
4.1.2.2 LOCAL SETPOINT OPERATION
The instrument must be in the Control mode to allow the setpoint value to be adjusted. In the
Control mode, to view the setpoint, press and release the UP or DOWN key. The green LED
under the SP label will light to indicate that the displayed value is the setpoint. To change the
setpoint value, press and hold the appropriate key. Press and hold the UP key to increase
the setpoint or press and hold the DOWN key to decrease the setpoint. The setpoint will
change slowly at first then faster as the key is held pressed. If the setpoint will not increase,
check the Program mode (page 25) to see that you are not trying to increase the setpoint
above the setpoint limit SPL. Check that the Setpoint Change mode is on in the Enable
mode.
4.1.2.3 PROFILE OPERATION
To start a profile, press and release the SCROLL key to sequence the display to the profile
number display code P1, P2, etc. With the desired profile number displayed, press either the
DOWN or the RUN/HOLD to start the profile. run will be displayed for about 2 seconds to
indicated that the profile is starting. The status lamps will indicate which segment is active
and if the profile is in the ramp or soak portion of the segment.
To stop a profile that is running, press the RUN/HOLD key. The display will show hold for
about 2 seconds, then the process value for about 2 seconds and then continue to display
this sequence. The profile timer will stop but the control, alarm, and event outputs will remain
active. The profile can be restarted by pressing the RUN/HOLD key. To exit the profile, go to
hold and then press and release the SCROLL key until the display shows oFF or CtrL, then
press the DOWN key. Pressing the DOWN key with oFF displayed will cause the control,
alarm, and events to be turned off. (Pressing the DOWN key with CtrL displayed will leave
the events as they were, and the control and alarm outputs will remain active). The setpoint
will be the last setpoint seen in the profile.
While a profile is running, it is possible to display additional profile status information. To
activate the Profile Execution Status Display sequence, hold the DOWN key and press the
SCROLL key. This will cause the display to sequence through the following series of display
codes and values:
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