RP-2002 Series Manual —
P/N 53039:E6 1/26/2017
37
ANN-BUS Devices
Installation
Exception:
When using the N-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 N-ANN-80 Remote LCD Annunciators
•
1 N-ANN-S/PG Serial/Parallel Printer Interface Module
•
1 N-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 36, 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
N-ANN-80 Current Draw
= 2 X 0.040 amps
= 0.080 amps
N-ANN-S/PG Current Draw
= 1 X.0.040 amps
= 0.040 amps
N-ANN-I/O Current Draw
= 1 X.0.200 amps
= 0.200 amps
Total Worst Case Current Draw
= 0.320 amps
Summary of Contents for NOTIFIER RP-2002C
Page 158: ...Cut along dotted line ...
