5 Electrical Interconnections Converter
12
S4
D184B122U02
5
Electrical Interconnections Converter
5.1
General (Power Usage)
The connection voltage and the current draw is listed on the type tag on the converter. The wire cross
section for the supply power and the size of the main fuse to be used must be compatible (VDE 0100). The
power usage is
≤
45 VA (flowmeter primary including the converter).
5.2
Supply Power Connections
The supply power connection, in agreement with the specifications on the type tag is connected to terminals
L (Phase), N (Neutral) or 1+, 2- and
. The supply power connection must be sized for the current. The
leads must correspond to IEC 227 or IEC 245. A switch or line switch is to be installed in the supply power
line, in close proximity to the converter, and identified as belonging to the instrument. The converter and the
flowmeter primary are to connected in accord with the international standards to earth
.
The connections are made in accordance with the Interconnection Diagrams beginning on Page 14.
5.3
Magnet Coil Supply
The magnet coils are supplied directly from the converter over terminals M1, M3 using cable (Part No.
D173D147U01), shielded 2 x 1.0 mm
2
. 10 m are included at no charge with the shipment unless a special
order has been requested.
5.4
Signal Cable Connections
The signal cable carries an AC voltage of only a few millivolts and should therefore to be routed over the
shortest path. The cables should not be routed in the vicinity of large electrical machinery and switch gear
equipment which could induce stray fields, pulses and voltages. The signal cable should not be fed through
branch fittings or terminal strips.
The maximum allowable signal cable length for flowmeter primary designs without a preamplifier is 50 m. If
the flowmeter primary includes a preamplifier, the maximum signal cable length is 200 m.
In the cable, a shielded reference voltage cable runs parallel to the signal leads, so only two cables are re-
quired to interconnect the flowmeter primary and the converter (signal cable and magnet coil supply cable).
The construction of the signal cable includes a woven copper shield (common potential) which surrounds
the individually shielded signal leads and the shielded reference leads. A steel outer shield is connected to
the terminal on the converter housing. The signal lead shields are operated as “Driven Shields” for the flow
signal transmission. The signal/reference voltage cable is connected according the Interconnection Diagram
to the flowmeter primary and the converter.
The voltage supply for the FSM4000 with a preamplifier is made over -U and +U, instead of over 1S and 2S.
If the actual flow direction does not correspond to the flow direction arrow then leads connected to 1 and
1S must be interchanged with those connected to 2 and 2S. For flowmeter primaries with a preamplifier only
the leads connected to terminals 1 and 2 need be interchanged.
The common potential 3 is the same as the common potential of the flowmeter primary, which is connected
to earth per VDE 0100.
!
Attention!
Observe the limiting values for the supply power (for values see Specifications). The voltage drop for the 24
V AC/DC supply power cable must be taken into account when the cable lengths are long.