BKI GO-36 Wartungshandbuch PDF herunterladen (Seite 28)

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BKI 09 ATEX 0003X

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htk4014a0600p_01.doc

Power supply

Nominal voltage 24 V DC

Maximum voltage (U

input

): 35 V DC

Minimum voltage (U

input

): dependent on load impedance, see graph below

Load impedance R

Loop resistance, R

loop

HART

+ R

cable

+ R

ammeter

Ohm

Minimum load impedance R

Ohm

Maximum load impedance R

750

Ohm

Non-hazardous-duty version

HART

4 ... 20mA

MikroTREK 2 vezetékes

HART

resistance for HART® communication 250 Ohm, recommended

Line A = minimum voltage at the MicroTREK 2-wire terminals

Line B = minimum supply voltage (for voltage drop caused by a 250 Ohm loop resistance)

Example for calculating the power supply: The voltage drop is tested at 22 mA: U

power minimum 22

= 22 mA x load impedance + U

input minimum 22

power minimum 22

= 22 mA x 250 Ohm + 10 V = 5.5 V + 10 V = 15.5 V

In order to cover the whole current range, the voltage drop must also be tested at 4 mA:

By analogy, the following applies: U

power minimum 4

= 4 mA x load impedance + U

input minimum 4

power minimum 4

= 4 mA x 250 Ohm + 18 V = 1 V + 18 V = 19 V

At a load impedance of 250 Ohm a power supply voltage of 19 V is sufficient to energize the current device range of 4 to 20 mA.

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