Super Systems 20Q - Manual (Page 70)

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OUT FAILURE DETECTION FUNCTION (OFD) OUT FAILURE DETECTION FUNCTION (OFD) OUT FAILURE DETECTION FUNCTION (OFD) OUT FAILURE DETECTION FUNCTION (OFD) OUT FAILURE DETECTION FUNCTION (OFD)
The device is capable to measure and display:
- the current running in a load driven by a time proportional
control output (main or secondary programmable) when the
load is energized;
- the leakage current flowing through the load when the load is
de-energized.
If the instrument has been correctly set, it generates an alarm
when:
- the current running in the load (when the load is energized) is
lower than the "A.L.Fd" [r.C14] parameter value (It shows a
partial or total break down of the load, the break down of the
actuator or a power down due to a protection or a fuse
intervention);
- the leakage current (when the load is de-energized) is higher
than the "A.H.Fd" [r.C15] parameter value (It shows a short
circuit of the actuator).
The "Display function" paragraph describes how to show the two
current values.
The fault condition is shown on the lower display by the "Fd.AL"
indication ("AL" may be flashing or steady on in accordance with
acknowledge condition) and by the status of the assigned
output.
If the ON or OFF period is lower than 120 ms the relative
measurement couldn't be performed and the instrument will
show flashing the last measured value.
MANUAL FUNCTION MANUAL FUNCTION MANUAL FUNCTION MANUAL FUNCTION 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 “ ”and “ ”.
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
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