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Page 15
AUTO / MANUAL OPERATION (16A3 ONLY)
The AUTO / MANUAL function allows you to manually adjust the output of the con-
trol. 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 / MANU-
AL key and hold for three seconds. The MANual indicator will light and the lower dis-
play 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 can be read as 0 to 100% of the
full control output, or 0 to 100% of the range between S10L and S10H or S20L and
S20H. If APCt is set for rEAL, a reading of 50% in MANUAL represents 10 mA
(Assuming a current output regardless of the S10L and S10H settings.) If APCt is set
for AdJ, then 50% in MANUAL will represent the mid point in output between S10L
and S10H. (Assuming a current output, 4 to 20 mA, with S10L set to 20 and S10H
set to 100, 50% will represent 12 mA.)
To return to AUTOmatic control, press the AUTO / MANUAL key again. The
MANual indicator will go out, and the set point will take over. However, 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 out put.
949-1265:Layout 1 1/25/11 10:22 AM Page 15
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