KROHNE UFM 500 EN - Manual (Page 11)

11
In case the meter is to be connected to a functional extra-low voltage source of
≤
18 V DC , protective separation in
conformity with VDE 0100, part 410 or an equivalent national standard must be ensured.
The connection diagrams are shown by the figures below.
3. (Initial) Start-up
•
Check that the system has been correctly installed as
described in sect. 1 and 2.
•
With separate systems, check before initial start-up
that the following details on the primary head
nameplate agree with the data specified in the report
of settings for the signal converter. If not, new setting
will be necessary:
Order No., see instrument nameplates
Meter size (DN), fct. 3.1.5, sect. 5.3
Primary constant GK, fct. 3.1.6, sect. 5.16
Flow direction, fct. 3.1.7, sect. 5.4
•
Before every start-up it is advisable to carry out a zero
check if the flow can be zeroed, as described in sect.
7.2.
•
When powered, the signal converter operates in the
measuring mode. TEST, NO ERROR and IDENT NO.
_ _ _ _ _ _ _ of the signal converter appear in
succession in the display. This is followed by display
of the actual flowrate and/or the internal count on a
continuous or alternating basis (depends on setting,
see report on settings)
If the compass field flashes (see sect. 4.4) on flowmeters
UFM 500... it may prove necessary to change the system
grounding, see sect. 1.3.2.
B1 B
- - B2 I+ I
I-
Active
I
≤
150 mA R1 R2
output A
output B
B1
B - -
B2
Remark: In case of one active output (A or B), the
resistance R1 or R2
≥
650
Ω
.
In case of two active outputs the equivalent
resistance of R1 and R2
≥
650
Ω
.
Output voltage U: 19 V*
≤
U
≤
32 V
Passive
B1 B ⊥ B2
Ÿ
U
ext
I
000
Σ
I
Electronic e.g.
or electro- signal
mechanical indicator
totalizer
Uext ≤ 32 V DC /24 V AC
I ≤ 150 mA
P S
Passive Active
Ri
≤
680
Ω
Ri
≤
680
Ω
mA mA
U
ext
≤ 18 V DC
Current output (I) Fig. 1
Pulse output (P)
Status output (S) Fig. 2
Pulse output (P)
Status output (S) Fig. 3
* 19 V at full load on all active outputs