Dwyer 8600 - Manual (Page 14)

949-1277-3 Page 14 December, 1998
To suspend the program at any time, press the RUN / HOLD key. Press
the key again to resume.
Pressing the AUTO / MANUAL key will also suspend the program opera-
tion. The difference is that AUTO / MANUAL also puts the control into
manual mode. See Auto / Manual Operation on page 13.
The function of the Primary Menu will change depending on the setting of the
StAt menu item in the Secondary Menu. If StAt is OFF then the Primary Menu
is not changed.
If the StAt menu item is set to On, then the Primary Menu has three
additional information items added before SP1 appears. The first INDEX
item, ####/ ti, displays the time remaining in the current segment. The next
INDEX item, ####/##ti, displays the total time for the active segment
(1ti...16ti). The third INDEX item, ####/##SP, displays the segment set
value (1SP...16SP). The next INDEX press resumes the normal Primary
Menu
AUTO / MANUAL OPERATION
The AUTO / MANUAL function allows you to manually adjust the output of
the control. This is normally used during process setup or start up. It can
also be used for troubleshooting. To switch from AUTO to MANUAL press
the AUTO / MANUAL key. The MANual indicator will light and the lower
display will change from normal to showing the actual output in percent. The
value will be the actual percentage of output that was active when the key
was pressed. This is usually known as "bumpless transfer".
If you wish to change the output while in manual, press the UP ARROW or
DOWN ARROW keys to change the value, and press ENTER to retain it. It
is important to remember that the value of the display is read as 0 to 100%
of the full control output, NOT the range between S1OL and S1OH or S2OL
and S2OH. For example, if the set point one output is programmed for 4 to
20 mA (S1OL=20, S1OH=100), a reading of 50% in MANUAL represents
10 mA, not 12mA. This allows the operator to go above and below the output
range to allow for improperly function equipment that may be connected to
the control output.
To return to AUTOmatic control, press the AUTO / MANUAL key again. The
MANual indicator will go out, and the set point will take over. If you want
bumpless transfer back to AUTO, slowly change the percentage of output
until the process variable matches (or at least is close) to the set point. The
further away the PV is from the set point, the greater the "bump" or upset
there will be in the output.