FCUElectrical connection
Relay 1
Relay 2
value <
lower limit or
Measured
value
>
upper limit
Measured
value > upper
limit
Outside range Measured
value ≤ lower
limit or
measured
value ≥
upper limit
After
switching the
unit on or
starting a
measuremen
t or
lower limit <
measured
value <
upper limit
Measured
value ≤ lower
limit or
measured
value ≥ upper
limit
After switching
the unit on or
starting a
measurement
or
lower limit <
measured
value < upper
limit
No function
Always off
Always off
M3
Measuremen
t is currently
in progress
and one or
more of the
last 5
measured
values > limit
5
consecutive
measured
values ≤ limit
or
measuremen
t stopped
After the first
measured
value is
available:
Flow error
Flow rate
within set
range
M4
Start or result
of check
measurement
after test
cycle time ≥
upper limit
Measuremen
t is currently
in progress
and the
measured
values > limit
5
consecutive
measured
values ≤ limit
or
measuremen
t stopped
After the first
measured
value is
available:
Flow error
Flow rate
within set
range
When test
cycle time
elapsed, for
the duration of
a check
measurement
Test cycle
time has
elapsed -
check
measuremen
t is running.
Goes out
again when
measured
value <
upper limit.
Test cycle
time is
restarted
M5
FCU 2000-4 series
en(us)
33 / 120
BEWA FCU2000-4 3109987h en-us 2017-01-24.docx
2017-01-24
