Hydraulic diagram
Relays 1 and 2 are limit value switches (change-over contacts) and also
serve to control a filtration unit.
Relay 3 outputs the operational readiness signal (DEVICE READY)
(closing device; closed when FCU is ready for operation)
The evaluation electronics in the FCU continuously monitors for this purpose
the following:
•
the particle sensor
•
the filter clogging indicator
•
the flow rate sensor
•
the power supply voltage
•
the internal evaluation electronics
The contact from Relay 3 is always closed during normal operation.
Relay 3 opens the contact when a malfunction is recognized.
A corresponding fault message appears automatically in the display in the
event of a malfunction, and the storing of data is interrupted. (see also in this
connection the chapter Error Messages / Troubleshooting)
As soon as the error has been rectified, the evaluation electronics recognizes
this fact, resets the fault message fully automatically and closes the Relay 3
contacts. Both the measuring operations and the storing of data are
resumed.
This ensures that measurement operations can restart without requiring the
intervention of operating personnel after malfunctions such as voltage loss,
flow errors caused by drops in pressure, etc. have been eliminated in
permanent online operation.
All of the measured and stored measured values can be read out via the
serial interface (11), e.g. by means of a PC. (Software and cable are included
in the scope of delivery.)
The built-in dot-matrix printer (14) documents the measurements in the form
of tables or graphs.
FCU 2000-4 series
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2017-01-24
