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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.
DIRECT ACCESS TO THE SET POINT
When the device is in AUTO mode and in “Normal Display
Mode”, it is possible to access directly to the selected set point
modification (SP, SP2, SP3 or SP4).
Pushing s or t for more than 2 s, the set point will begin
changing.
The new set point value becomes operative since no push-
button has been depressed at the end of 2 s time out.
The direct access to the set point is disabled if the run time
group 1 is software protected or remote set point is used.
Xkc-1-C0.P65 5/29/02, 11:59 AM70
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