Ritron DATAFLOW RTU Series Betriebsanweisung PDF herunterladen (Seite 20)

Installation/Operation

( A-14 )

15. POWER

15.1 The DATAFLOW RTU small enclosure (S) may be purchased with the delete internal power (D) option.

The RTU power source is a user-provided external power supply meeting the following criteria:

· Between 10 VDC and 16 VDC with 12 VDC nominal;

· Has less than 1 V peak-to-peak of ripple;

· Provides 1.5 A with the transmitter in low power setting;

· Provides 2.5 A with the transmitter in high power setting.

15.1.1 Connect the positive side of the power supply to J105 pin 6. Connect the negative side of the power

supply to J105 pin. The negative side of the power supply is considered to be GROUND and is the

REFERENCE to which all inputs, outputs and measurements are to be made. GROUND is connected to

the enclosure.

15.2 You can purchase the DATAFLOW RTU with an eight-cell internal battery holder (power option 1). In this

option, internal AA batteries are used as the power source.

CAUTION: When installing the batteries, be sure to match polarities of the batteries with the

battery holder. Not matching polarities can damage the RTU.

15.2.1 The negative side of the battery assembly is considered to be GROUND and is the REFERENCE by

which all inputs, outputs, and measurements are to be made. GROUND is connected to the case.

15.2.2 The battery voltage appears at pin 8 of J105 pin 8, and is not connected directly to the input power of the

RTU control board. With jumper PJ106 installed, the battery is jumpered to the input power. With jumper

PJ106 not installed, an external connection is required between pin 6 and 7, which allows the user to

install an external ON/OFF switch to the RTU while using internal power.

15.3 J101 pin 5 is connected to the RTU power source, and J101 pin 6 is connected to GROUND. This power

supply provides excitation voltage to external equipment with maximum current draw of .25 A.

15.4 Fuse F101 (X3.2 - Y0.1) is a 40-gauge tinned wire designed to open at 2.5A. If this fuse is destroyed,

replace it with nothing larger than 40-gauge wire.

15.5 Optional Internal Battery Back-up (Refer to 11.1.3 for the appropriate pin numbers.)

Either of the following two options may be used as an optional internal battery back-up:

a. A two 4-cell battery pack (OMEGA Part No. RTU-BATNICD),

b. An 8-cell AA battery holder (OMEGA Part No. RTU-BAT/HOLD).

15.5.1 Connect the battery as shown in Figure A6:

15.5.2 The following equations define the values required for R1.

R1 = (Vsource - Vdiode - Vbattfull) / Icharge

PR1 = (Vsource - Vdiode - Vbattempty)

/ R1

WHERE: R1 is the value of R1 in Ohms 

Vsource is the input voltage to the RTU.

Vdiode is the voltage drop of the diode (CR1).

Vbatfull is the fully charged voltage of the internal battery.

Icharge is the charge current to the battery.

PR1 is the power rating of R1 in Watts.

Vbattempty is the empty voltage of the internal battery.

Figure A6 - Battery Connection Wiring Diagram

RTU 7-PIN

CONNECTOR

CR1

CR2

6 RED

7 ORN

5 BRN

B +

V 1

G N D

V source

G N D

NOTE: CR1and CR2

are to be 1N5817

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 62 63

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