21
GB
7) Pushing s or t select the "On" indication
and push the FUNC pushbutton.
The instrument will show on the upper display
the actual valve position in percent and, on the
lower display the "POS.H" message.
8) Pushing continuously s or t pushbutton,
drive the servomotor to the end of its stroke.
9) Push the FUNC pushbutton.
The display will show "FB.HC" (feedback high
limit calibration).
10) Pushing s or t select the "On" indication
and push the FUNC pushbutton.
The instrument memorizes the new feedback
potentiometer calibration and return in
MANUAL mode.
NOTES:
1) The minimum span (FB.LC- FB.HC) acceptable
for the instrument is equal to 20 % of the
feedback potentiometer selected (see P23
parameter). When the instrument detect a
span lower than 20%, it shows on the lower
display the “Err” indication while the upper
display shows the code 302.
Push contemporarily the s and t
pushbuttons for loading the default feedback
potentiometer calibration values and then
repeat the feedback potentiometer calibration.
2) The instrument is able to assure a 1%
resolution for the potentiometer indication only
if the calibrated span is greater than 30 % of
the feedback potentiometer selected by P23).
ENABLE/DISABLE THE CONTROL OUTPUT
NOTE: when the instrument is programmed for
servomotor control drive, this function is not avail-
able.
When the instrument is in "normal display mode", by
keeping depressed for more than 5 s s and FUNC
pushbuttons, it is possible to disable the control
outputs. In this open loop mode the device will
function as an indicator, the lower display will show
the word "OFF" and all control outputs will be in the
OFF state.
When the control outputs are disabled the alarms
are also in non alarm condition.
The alarms output conditions depend on the alarm
action type (see P26-P28).
Depress for more than 5 s s and FUNC
pushbuttons to restore the control status.
The alarm standby function, if configured, will be
activated as per power up.
If a shut down occures when the control output is
disabled, at instrument power up the control output
will be disabled again.
MANUAL FUNCTION
The MANUAL mode function can be accessed (only
if enabled by P38=On) by depressing the MAN
pushbutton for more than 1 sec or by closing the
external contact 2 (see P24 parameter).
The command from keyboard is accepted and
executed only if the display is in "Normal Display
Mode".
The command from external contact is always
accepted.
When in MANUAL mode the LED's MAN
annunciator will light up while the lower display
shows the valve position (if configured) or power
output values if time proportioning control output
LFS-servo-1-02.p65 1/14/02, 3:44 PM21
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