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IM 1F6A0-01E
4-1
4. WIRING
4. WIRING
WARNING
This instrument must be installed by expert engineer
or skilled personnel. The procedures described in this
chapter are not permitted for operators.
4.1 Power Supply and Load Re-
sistance
The remote converter type (DY-N) vortex flowmeter is used
with the Model DYA converter. To connect these instru-
ments, use a special cable (DYC). 30m (97.5 feet) is the
maximum length.
The integral type (DY) vortex flowmeter measures fluid flow
rates and converts them directly to a 4 to 20 mA DC output
and pulse output signals.
Table 4.1 shows the connection method of several output
conditons.
(1) Analog Output (4 to 20 mA DC)
This converter uses the same two wires for both, the
signal and power supply. A DC power supply is required
in a transmission loop. The total leadwire resistance
including the instrument load and power distributor
(supplied by the user) must conform to a value in the
permissible load resistance range. Table 4.1 shows
typical wiring connections.
R=
E–10.5
0.0236
250
600
10.5
16.4
24.7
30
42
Power Supply Voltage E (V)
Communication
Applicable range
BRAIN and HART
Load resistance R (
Ω
)
F040101.EPS
Figure 4.1
Relationship between Power Supply Voltage
and Load Resistance (4 to 20 mA DC Output)
(2) Pulse output and Alarm, Status Output
This version uses three wires between the converter and
the power supply. A DC power and load resistance are
required, and pulse output is connected to a totalizer or
an electric counter. Low level of the pulse output is 0
to 2V. No communication is possible over a transmis-
sion line. Communication via the amplifier board is
always possible irrespective of the wiring condition.
(3) Simultaneous Analog-Pulse Output
When using YEWFLO in the simultaneous analog -pulse
output mode, the communicable distance of the transmis-
sion line is restricted on the wiring method. Table 4.1
shows the examples of flowmeter installation for this
output mode. Communication via the amplifier board is
always possible irrespective of the wiring condition.
IMPORTANT
For pulse output and the simultaneous analog-pulse
output ,use the load resistance. Refer to Table 4.1.
4.2 Connection
Table 4.1 shows the connection sample of connection for
power supply and load resistance. The terminal position of
each connection is shown in Figure 4.2.
Integral type
Remote type
F040201.EPS
Input Terminal from built-
in temperature sensor
Input Terminals from
vortex detector
Common Terminal
4 to 20 mA DC Output Power Supply
and Output Signal Terminals
Supply
–
Pulse Output Terminal
Pulse
T
A
B
C
Figure 4.2