Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 35)

<4. WIRING>

4-11

IM 01E30D01-01EN

Table4.6.3 General-purposeUse/ExplosionProofTypeexceptTIISWiringExamples(SimultaneousCurrent-

Pulse Output)

Connection Description

Simultaneous Current-

Pulse Output

When simultaneous output of current and pulse output are used, no communication is possible

in some cases. Refer to following example 1 to 3.

Example 1

In this case,

Communication is

possible (up to a

distance of 2 km when

a CEV cable is used)

and when a two-wire

shielded cable is used.

No communication is possible

when a shielded cable is not used.

However, simultaneous current-pulse output is possible.

Shielded Cable

SUPPLY

Distributor, etc.

−

Shielded Cable

For the shielded cables in this example,

use two-wire shielded cables

separately for SUPPLY and DO.

AXR Terminal

E3:30 V DC max

Cable Resistance:R1[Ω] *9

Cable Resistance:R2[Ω] *9

0.0236 x (R1 + R2+ R3) + 14.7 ≤ E1 [V] ≤ 42

*10

In the case of R3=250[Ω]

0.0236 x (R1 + R2) + 20.6 ≤ E1 [V] ≤ 42

*10

*3: This supply voltage requires a power source

with a maximum output current of no less than E3/R.

Electric

counter

R3[Ω]:Load Resistance

Example 2

In this case,

Communication is

possible (up to a

distance of 2 km when

a CEV cable is used)

and when a one-wire

shielded cable is used.

Shielded Cable

SUPPLY

Distributor, etc.

−

Shielded Cable

For the shielded cables in this example,

use two-wire shielded cables

separately for SUPPLY and DO.

AXR Terminal

30 V DC max

0.0236 x (R1 + R2+ R3) + 14.7 ≤ E1 [V] ≤ 42

*10

In the case of R3=250[Ω]

0.0236 x (R1 + R2) + 20.6 ≤ E1 [V] ≤ 42

*10

Cable Resistance:R1[Ω] *9

Cable Resistance:R2[Ω] *9

Electric

counter

R3[Ω]:Load Resistance

*4: This supply voltage requires a power source

with a maximum output current of no less than E3/R.

Example 3

In this case,

No communication is

possible when a three-

wire cable is used.

250Ω

0.0236×﴾R1

R2﴿

20.6≤E5

[

]

≤30

*5: This supply voltage requires a power source

with a maximum output current of no less than (E5/R+0.0236).

SUPPLY

−

AXR Terminal

Electric

counter

−

Recorder

or other

instrument

−

Cable Resistance

R2[Ω] *9

Cable Resistance

R1[Ω] *9

The range of load

resistance R for the

pulse output

herangeofloadresistanceRforthepulseoutputmustbasicallybe1kΩand2W.Theload

resistance should be selected by calculation as shown below when proper transmission is

impossible due to the length of cable or frequency of pulse output.

P (mW) =

…………………………

(2)

R (kΩ)

(V)

≤ R (kΩ) ≤

…

(1)

120

E (V)

C (μF) × f (kHz)

0.1

E: Supply voltage (V)

f: Frequency of pulse output (kHz)

:Valueofloadresistance(kΩ)

C:Cablecapacitance(μF)

P: Electrical power of the load resistance (mW)

Note: C

0.1(μF/km)forCEVcable

Note: •ThecommunicationispossiblethoughitmightnotmeetapartoftheHARTcommunicationspecicationdependingonuseconditions.

 •Whenusingcurrentandpulseoutputsimultareously,theHARTcommunicationmaybeinuencedbynoisecomparinganalogoutput

only.

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