Secutron MR-3318, Инструкция по установке и эксплуатации

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7.0 Wiring
This chapter describes the proper field wiring for the MR-3318.
7.1 Wiring Tables
7.1.1 Addressable Loop Wiring Maximums
Advanced Protocol and CLIP Devices
• Maximum Loop Current = 350 mA
• Maximum Loop Resistance = 40 ohms
• Maximum Loop Capacitance = 0.5 μ F
• Maximum Number of Isolators = 20
7.1.2 RS-485 Wiring to Annunciators and other Devices
• Use twisted shielded pair
• 22 AWG maximum of 2000 feet
• 20 AWG maximum of 4000 feet
7.1.3 NAC and Auxiliary Power Supply Circuits
Table 18 Advanced Protocol and CLIP Devices Addressable Loop Wiring Table
Wire Gauge Maximum Wiring Run to Last Device
(AWG) ft m
18 3030 923
16 4760 1450
14 7690 2343
12 9820 2993
Table 19 NAC and Auxiliary Power Circuits Wiring Table
TOTAL
SIGNAL
LOAD MAXIMUM WIRING RUN TO LAST DEVICE (ELR) MAX. LOOP
RESISTANCE
18AWG 16AWG 14AWG 12AWG
Amperes ft m ft m ft m ft m Ohms
0.06 2350 716 3750 1143 6000 1829 8500 2591 30
0.12 1180 360 1850 567 3000 915 4250 1296 15
0.30 470 143 750 229 1200 366 1900 579 6
0.60 235 71 375 114 600 183 850 259 3
0.90 156 47 250 76 400 122 570 174 2
1.20 118 36 185 56 300 91 425 129 1.5
1.50 94 29 150 46 240 73 343 105 1.2
Notes:
Main Board NAC Circuits are rated for of 1.5 Amperes each.
Maximum Voltage Drop Should Not Exceed 1.67 Volts
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