Super Systems 20PQ - Manual (Page 114)

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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 related
measurement couldn't be performed and the instrument will
show, flashing, the last measured value.
SERIAL LINK
The device can be connected to a host computer by a serial link.
The host can put the device in LOCAL (functions and param-
eters are controlled via keyboard) or in REMOTE (functions and
parameters are controlled via serial link).
The REMOTE status is signalled by the REM LED.
This instrument allows to modify the operative and configuration
parameters, via serial link.
The necessary conditions to implement this function are the
following:
1) the serial parameters (see Run time group 7) should be
properly configured.
2) the device must be in the run time mode.
3) when it is desired to modify configuration parameter, the dip
switch V101.3 should be set to "OFF" (configuration
parameter enabled)
During configuration parameter downloading the device goes in
open loop with all output in OFF state.
At the end of configuration procedure, the device performs an
automatic reset and then returns to close loop control.
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