Operation Manual

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 1kΩ, 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(kΩ) =

0.1

(1)

C(µF) X f (kHz)

(*1)

Over 200Ω 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) =

(2)

E: Power supply voltage

P : Electricity of resistance

CAUTION