Siemens Pacemaker UM344-2 Instrukcja Użytkownika Pobierz pdf (Strona 182)

CONTROLLER MODE INSTALLATION WIRING UMA344-2-1

250

See

Note 2

See Note 4

Notes:

1. I/P device examples are: Transducer Model 77, 771, 772R or 773 and Valve Positioner Model 750E

or 760E. The I/P can be either a HART or non-HART signalling device, a Primary Master or a

Secondary Master.

The System Power Supply is shown as a separate device. In practice, it may be part of a network

device.

2. Network resistance equals the sum of any barrier resistances and the current sense resistor.

Minimum value 250 Ohms; maximum value 1100 Ohms.

3. Connect the MXC (a Secondary Master) to the loop only in the non-hazardous location. The MXC

is a non-polar device.

4. Interconnect all cable shields and ground only at the power source.

5. For access to Model 344 terminals, remove shorter end cap.

6. Maximum loop cable length calculated by formula in Section 4.3.5.

7. Install a HART communication filter when using a Model 77, 771, 750E or other high impedance

coil-type device. The filter bypasses HART signals around the high Z device.

See Note 5

Network

Junction

Qty. 2

See Note 6

Network for Non-Hazardous Locations

Signal

Test

X03013S1

Model 344

Terminals

Sensor

Terminals

HART

Communication

Filter

See Note 7

I/P Device

See Note 1

Power Supply

See Note 1

Optional Terminal Boards

for Two Splices: Shield and

Negative Lead

FIGURE 4-2a Model 344 Connections, Controller Function Block ON (Analog Mode)

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1 2 ... 177 178 179 180 181 182 183

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