System Sensor PDRP-2001 User Manual

Page 35

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PDRP-2001 Series Manual — P/N 53043:E1 2/28/2011

35

ANN-BUS Devices

Installation

Exception: When using the ANN-RLY module, the installer must ensure that the maximum
24VDC power line drop does not exceed 0.3 volts. This results in the following wiring limitations:

Wiring Distance Calculation Example:

Suppose a system is configured with the following ANN-BUS modules:

2 ANN-80 Remote LCD Annunciators

1 ANN-S/PG Serial/Parallel Printer Interface Module

1 ANN-I/O LED Driver Module

The total worst case current is calculated as follows:

Using this value and referring to the Wiring Distance Table 2.1 on page 34, it can be found that the
available options are:

463 feet maximum using 22 Gauge wire

1,172 feet maximum using 18 Gauge wire

1,866 feet maximum using 16 Gauge wire

2,953 feet maximum using 14 Gauge wire

Wire Gauge

Ohms per 1,000 feet (Rpu)

22

16.2

18

6.4

16

4.02

14

2.54

Wire Gauge

Maximum Wire Length

18

312 feet

16

497 feet

14

787 feet

12

1,250 feet

ANN-80 Current Draw

= 2 X 0.040 amps

= 0.080 amps

ANN-S/PG Current Draw

= 1 X.0.040 amps

= 0.040 amps

ANN-I/O Current Draw

= 1 X.0.200 amps

= 0.200 amps

Total Worst Case Current Draw

= 0.320 amps

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