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5-9
IM 1F5B2-01E
5. WIRING
IMPORTANT
Pull-up Resistance is necessary for pulse output. ( When resistance is low, amplifier will
be wrong.)
Pull-up Resistance is basically 1k, 1W. Depend on the cable length and pulse output
frequency, transmission may be disrupted. Determine the resistance value by equation
(1), and electric power of resistance by equation (2).
Take care of hot resistance.
5-8 Simultaneous Analog-Pulse Output
When using ULTRA YEWFLO in the simultaneous analog-pulse output mode, the
communicable distance of the transmission line is restricted depending on the wiring
method. Figure 5.6-4 illustrates three examples of flowmeter installation for this
output mode.
Communication via the amplifier board is always possible irrespective of the wiring
conditions.
R(k) =
0.1
(1)
C(µF) X f (kHz)
(*1)
Over 200 is necessary for R.
C : Capacitance of the cable f : Pulse output frequency
In case of (*1)CEV cable (2SQ),
0.1µF/km
P (W) =
R
E
R
2
(2)
E: Power supply voltage
P : Electricity of resistance
R
CAUTION
36


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