IM 1F6A0-01E
4-2
4. WIRING
Talbe 4.1 The connection example for simultaneous analog and pulse and alarm, status output.
250
Ω
R
+
–
+
PULSE
SUPPLY
YEWFLO Electrical Terminal
Recorder or
other instrument
This supply voltage requires
a power sourse with a
maximum output current of
no less than E/R+25mA.
Electric counter*1
E(16.4 to 30V DC)
Counting input
Common
+
+
YEWFLO Electrical Terminal
250
Ω
24V DC
PULSE
SUPPLY
+
–
Distributor
–
+
–
+
PULSE
SUPPLY
R
E
YEWFLO Electrical Terminal
Use the Three-wire shielded cable.
Electric counter
Shielded Cable
PULSE
SUPPLY
+
–
+
Mognetic
valve
AC power supply
External Power supply
30V DC, 120mA max
YEWFLO Electrical Terminal
E
250
Ω
R
+
–
+
PULSE
SUPPLY
Counting input
Common
For the shielded cables in this
example of flowmeter installation,
use two-wire separately shielded
cables.
This supply voltage requires a power
sourse with a maximum output current
of no less than E/R+25mA.
Recorder or
other instrument
Electric counter*1
E(16.4 to 30V DC)
Shielded Cable
The supply voltage requires output
impedance no more than 1/1000 of R
(load resistance).
YEWFLO Electrical Terminal
250
Ω
R
E(10.5 to 30V DC)
Counting input
Common
24V DC
PULSE
SUPPLY
For the shielded cables in this example of
flowmeter installation, use two-wire separately
shielded cables.
This supply voltage requires a power sourse
with a maximum output current of no less than
E/R.
Distributor
Electric counter*1
+
–
+
Shielded Cable
YEWFLO Electrical Terminal
When analog and pulse output are used, the length of communication line is subjected to wiring conditions. Refer to
examples 1 to 3. If the communication carries out from amplifier, no need to consider wiring conditions.
*2
*2
*2
*2
*1
*1 In order to make it not influenced
of an external noise, use an
electronic counter suitable for the
frequency band of a pulse output.
*2 The load resistance is not required
when using a electric counter
which can receive contact pulse
signal.
Analog Output
Pulse Output
Status Output
Alarm Output
Simultaneous
Analog
-Pulse Output
Description
Connection
T040201.EPS
0.1
C (
µ
F )
×
f ( kHz )
R (k
Ω
)
120
E (V)
The load resistance of pulse output should be used to 1k
Ω
, 2W.
If no translation of the pulse output possible by the cable length or the frequency of the pulse output,
the load resistance should be selected by calculation as shown below.
Example of CEV cable capacitance
ⱌ
0.1
µ
F/km
Where
E = Supply voltage (V)
f = Frequency of pulse output (kHz)
R = Value of load resistance (k
Ω
)
C = Cable capacitance (
µ
F)
P = Power ratio of the load resistance
(mW)
P (mW) =
R
(k
Ω
)
E
2
(V
2
)
Example 3
In this case, No communi
-cation is possible (when
shielded cable is not used).
The range of load
resistance R for
the pulse output.
Example 1
In this case, Communica
-tion is possible(up to a
distance of 2km when a
two-wire separately
shielded cables cable is
used).
Example 2
In this case, Communica
-tion is possible (up to a
distance of 200m when a
two-wire separately
shielded cables cable is
used and R = 1k
Ω
).
In this case,
Communication is
possible (up to a
distance of 2km when
a CEV cable is used).
In this case, No
Communication is
possible.
In this case, No
Communication is
possible.
