Flowserve 510si Series Digital Positioner - Manual (Page 11)

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User Instructions Logix 510si - LGENIM0510-0
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8.7.2.2 To activate the Binary AO feature:
1. Move the AI/AO calibration dip switch to the AO
position.
2. While pressing the ‘Jog Down’ Button, press
and hold the ‘Loop Cal’ Button for at least 3
seconds, then release all buttons. This should
not begin a calibration sequence. If a calibra-
tion does begin, briefly press the ‘Loop Cal’
Button again to cancel it.
The unit is now in Binary AO mode. No blink code
or other confirmation is given, however, the AO loop
current will now be either the Normal (NoFail) current
level or the Fail current level.
8.7.2.3 To (re)activate the Linear AO feature:
1. Move the AI/AO calibration dip switch to the AO
position.
2. While pressing the ‘Jog Up’ Button, press and
hold the ‘Loop Cal’ Button for at least 3 seconds.
The unit is now in Linear AO mode. No blink code
or other confirmation is given, however, the AO loop
current will now represent the valve stem position in
percent. This is the default setting following any factory
reset.
8.7.2.4 To calibrate the Binary AO current levels:
1. Set the unit to Binary AO mode as described
above.
2. Press and hold only the ‘Loop Cal’ Button for at
least 3 seconds. The AO current level will ini-
tially be set to the Fail setting, and the blink
code will indicate ‘Waiting for user to set AO
Zero’ (YGGG).
3. The ‘Fail’ current level can be adjusted by
pressing the ‘Jog Up’ or the ‘Jog Down’ but
tons until the desired current is obtained.
4. Press and release both Jog buttons simultane-
ously to accept the value. The AO current level
will now be set to the Normal (NoFail) setting,
and the blink code will indicate ‘Waiting for
user to set AO Span’ (YGYY).
5. The ‘Normal’ current level can be adjusted by
pressing the ‘Jog Up’ or the ‘Jog Down’ but-
tons until the desired current is obtained.
6. Press and release both Jog buttons simultane-
ously to accept the value. The blink code will
return to a sequence beginning with Green to
indicate everything is back online.
The Logix 510si AO circuitry needs about 10V minimum
voltage drop to operate properly, which means that the
maximum current available with 3.4k of external resist-
ance and a 24V supply is about 4mA. ( (24v-10v)/3.4k ).
Any calibrated value greater than 4mA will result in only
the 4mA max being produced, unless the 3.4k external
resistance is reduced or removed.
The default current levels with 3.4k of external loop re-
sistance and a 24V supply are 4mA (Normal) and 0.5mA
(Fail), with voltages across the external resistance being
13.6V (Normal) and 1.7V (Fail). With no external loop
resistance , the current becomes 7mA (Normal) and
0.5mA (Fail), and a voltage drop of 24V in both cases.