Videolarm qfdpt3-50na 用户指南
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Use the formula below to select the correct power supply for cameras connected in parallel (positive to positive, negative to negative):
Total current for a 24 VAC system:
TOTAL CURRENT = (202mA x total number of cameras) Example: 202mA x 5 total cameras = 1010mA
Note: 202mA is camera plus power supply
TOTAL CURRENT = (202mA x total number of cameras) Example: 202mA x 5 total cameras = 1010mA
Note: 202mA is camera plus power supply
CAMERAS VOLTAGE CURRENT POWER
1 24 VAC/VDC 102mA 2.5W
2 24 VAC/VDC 210mA 5W
3 24 VAC/VDC 331mA 7.9W
4 24 VAC/VDC 487mA 10.9W
CABLE AND POWER GUIDELINES
This chart shows the proper current needed for power supplies for Q-View Series cameras. Use Class 2 Power only. Input voltage must be
24 VAC/VDC.
24 VAC/VDC.
Power Supply Cable Maximum Length (feet/meters)
CAMERAS TOTAL LOAD POWER SUPPLY 24 AWG 22 AWG 18 AWG 16 AWG
1 2.5W 24 VAC/VDC 1718/523 2733/833 6909/2106 10985/3348
2 5W 24 VAC/VC 834/254 1327/404 3356/1023 5335/1626
3 7.9W 24 VAC/VDC 529/161 842/256 2129/649 3385/1032
4 10.9W 24 VAC/VDC 359/109 572/174 1447/441 2300/701
NOTE: The above table is based on a "worst-case" power supply. Using a regulated or switching power supply can increase your cable
distance. Videolarm recommends using our PS24 power supply, or a CSA/UL listed Class 2 power supply.
distance. Videolarm recommends using our PS24 power supply, or a CSA/UL listed Class 2 power supply.
Video Cable Maximum Length (feet/meters)
Cable Type RG-59 RG-6 RG-11
Wire Gauge 23 AWG* 18 AWG* 16 AWG*
Max. Length 750/229 1500/457 2000/610
* Copper clad steel core, 95% braided shield
AWG 250/76 500/152 1000/305 1500/457 2000/610 3000/914
18 3
Ω
6
Ω
13
Ω
19
Ω
26
Ω
40
Ω
20 5
Ω
10
Ω
20
Ω
30
Ω
40
Ω
59
Ω
22 8
Ω
17
Ω
33
Ω
48
Ω
66
Ω
99
Ω
24 13
Ω
26
Ω
52
Ω
78
Ω
108
Ω
163
Ω
Maximum Length (feet/meters)