FCU 8000 series
Hydraulic diagram
HYDAC FILTER SYSTEMS GMBH
en(us)
Page 20/112
BEWA FCU8000 3109776d en-us 2011-06-10.doc
2011-06-10
A continuous flow of oil runs through an optical sensor (1) comprised of a laser light
source (2) and a photo receiver (3). The contamination particles present in the flow
of oil cause pulse-like darkenings of the light beam, which are both classified as
measurement signals in accordance with particle size and counted by an evaluation
electronics system (4).
The measurement of the flow rate, which is necessary for specifying the
contamination class, is carried out by a built-in flow rate sensor (5), the signals from
which are also channeled to the electronic evaluation system (4).
Ultimately, the evaluation electronics (4) calculate on a continuous basis the particle
counts and the SAE / NAS or ISO contamination classes for the reference volume of
100 ml, based on the measurement signals from the optical sensor and the flow rate
sensor.
Here the measured values (up to 3000) are also stored on a continuous basis as
they arise, together with date and time, in a manner that is safe from network
outages. A battery-buffered real-time clock is available for this purpose.
A flow control valve (7) is available for adjusting the pressure fluctuation-
independent flow of oil.
A hydraulic filter (8) with electrical contamination indicator is positioned upstream
from this for the purpose of protecting against failure due to contamination.
The permanently adjusted valves (9) and (10) and the diaphragm memory (15)
enable the connection to extraction points for the pressure range of 1 ... 350 bar at
the "Inlet" access point.
The FCU can be operated via keyboard (12). Characteristic values for the
measurement can be modified and various kinds of presentation can be selected in
the LCD display (6).
If not set otherwise, the following information is continuously displayed during the
measurement (see also in this connection the chapter "The Display of the FCU"):
selected measurement mode
Progress of the ongoing measurement
Current value of the measurement results for 2 of the 4 particle size channels
Tendency: increasing or decreasing
Current flow value
only in the event of fault -> Error messages
Furthermore, the FCU also possesses 3 built-in relays with the following functions:
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)
