ero electronic MKC, User Manual, Page: 75 / 141

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MANUAL FUNCTION
The MANUAL mode function can be accessed (only if
configured) by depressing the MAN push-button for more than 1
sec or by acting on a logic input configured as "Au.ñA" (auto/
manual selection).
The command from keyboard is accepted and executed only if
the instrument is in "Normal Display Mode" while the command
from logic input is always accepted.
When in MANUAL mode the LED's MAN light up while the
middle display shows "ñ." followed by the main output values
(from 0.0 to 99.9%) and the lower display shows "S." followed by
the secondary output value (from 0.0 to 99.9%).
When the device is configured with one control output only and
this output is “Servo”, the display will show the current valve
position.
When the device has two control outputs and one of them is
“Servo”, during valve positioning the display will show the final
position of the valve and not the current position.
The control output and/or the feedback position can be modified
by using “
s
”and “
t
”.
To come back to the AUTO mode, depress “MAN” push-button
for more then 1 sec. or toggle the logic input.
The transfer from AUTO to MANUAL is bumpless (this function
is not provided if an output value has been selected at
configuration parameter “Añ.UL” [C.G04]).
The transfer from MANUAL to AUTO is bumpless or bumpless
balanceless (the bumpless feature is not provided if integral
action is excluded).
If transfer from AUTO to MANUAL is performed during the first
part of SMART algorithm (TUNE) when returning in AUTO the
device will be forced automatically in the second part of the
SMART algorithm (ADAPTIVE).
At power up the device starts as configured at “St.Fn” [C.G06]
configuration parameter.
NOTES :
1) When auto/manual control mode is selected by logic input, at
power up the instrument will start in accordance with the logic
input status.
If the logic input status requires the manual mode, the
instrument will verify the “St.Fn” [C.G06] parameter setting
and if “St.Fn” [C.G06] is equal to "Auto", "ñan" or “Cnd.A” the
power output will be set to zero otherwise the power output
will be set equal to the last value prior to power shut down.
Xkc-1-C0.P65 5/29/02, 11:59 AM 71