Cooper Security M2000 Uživatelská příručka stáhnout pdf (Strana 20)

Introduction Engineering Manual

Table 1. Voltage Drop

Current

Drawn

Cable Length (Standard 7/0.2 alarm cable)

10m 20m 30m 40m 50m 60m 70m 80m 90m 100m

60mA 0.10V 0.19V 0.29V 0.38V 0.48V 0.58V 0.67V 0.77V 0.86V 0.96V

80mA 0.13V 0.26V 0.38V 0.51V 0.64V 0.79V 0.90V 1.02V 1.15V 1.28V

100mA 0.16V 0.32V 0.48V 0.64V 0.80V 0.96V 1.12V 1.28V 1.44V 1.60V

120mA 0.19V 0.38V 0.58V 0.79V 0.96V 1.15V 1.34V 1.54V 1.74V 1.92V

140mA 0.22V 0.45V 0.67V 0.90V 1.12V 1.34V 1.57V 1.79V 2.02V 2.24V

160mA 0.26V 0.51V 0.77V 1.02V 1.28V 1.54V 1.79V 2.05V 2.30V 2.56V

180mA 0.29V 0.58V 0.86V 1.15V 1.44V 1.73V 2.02V 2.30V 2.59V 2.88V

200mA 0.32V 0.64V 0.96V 1.28V 1.60V 1.92V 2.24V 2.56V 2.88V 3.20V

220mA 0.35V 0.70V 1.06V 1.41V 1.76V 2.11V 2.46V 2.82V 3.17V 3.52V

240mA 0.38V 0.79V 1.15V 1.54V 1.92V 2.30V 2.69V 3.07V 3.46V 3.84V

260mA 0.42V 0.83V 1.25V 1.66V 2.08V 2.50V 2.91V 3.33V 3.74V 4.16V

280mA 0.45V 0.90V 1.34V 1.79V 2.24V 2.69V 3.14V 3.58V 4.03V 4.48V

300mA 0.48V 0.96V 1.44V 1.92V 2.40V 2.88V 3.36V 3.84V 4.32V 4.80V

320mA 0.51V 1.02V 1.55V 2.05V 2.56V 3.07V 3.58V 4.10V 4.61V 5.12V

340mA 0.54V 1.09V 1.63V 2.18V 2.72V 3.26V 3.81V 4.35V 4.90V 5.44V

360mA 0.58V 1.15V 1.73V 2.30V 2.88V 3.46V 4.03V 4.61V 5.18V 5.76V

380mA 0.61V 1.22V 1.82V 2.43V 3.04V 3.65V 4.26V 4.86V 5.47V 6.08V

400mA 0.64V 1.28V 1.92V 2.56V 3.20V 3.84V 4.48V 5.12V 5.76V 6.40V

420mA 0.67V 1.34V 2.02V 2.69V 3.36V 4.03V 4.70V 5.38V 6.05V 6.72V

440mA 0.70V 1.41V 2.11V 2.82V 3.52V 4.22V 4.93V 5.63V 6.34V 7.04V

460mA 0.74V 1.47V 2.21V 2.94V 3.68V 4.42V 5.15V 5.89V 6.62V 7.36V

480mA 0.79V 1.54V 2.30V 3.07V 3.84V 4.61V 5.38V 6.14V 6.91V 7.68V

500mA 0.80V 1.60V 2.40V 3.20V 4.00V 4.80V 5.60V 6.40V 7.20V 8.00V

520mA 0.83V 1.66V 2.50V 3.33V 4.16V 4.99V 5.82V 6.66V 7.49V 8.32V

540mA 0.86V 1.73V 2.59V 3.46V 4.32V 5.18V 6.05V 6.92V 7.78V 8.64V

560mA 0.90V 1.79V 2.69V 3.58V 4.48V 5.38V 6.27V 7.17V 8.06V 8.96V

580mA 0.93V 1.86V 2.78V 3.71V 4.64V 5.57V 6.50V 7.42V 8.35V 9.28V

600mA 0.96V 1.92V 2.88V 3.84V 4.80V 5.76V 6.72V 7.68V 8.64V 9.60V

Voltage Drop Example 1

Figure 5) shows two devices connected to the control unit. The first is 20m from the control unit

and has 60mA being taken from its auxiliary supply to power detectors. The second is 20m from

the first and also has 60mA being taken from its auxiliary supply to power detectors. The

example shows that the voltage levels at both nodes is acceptable. The voltage at each device is

as follows:

1. The total current being drawn at the first device = 120mA + 120mA = 240mA.

2. Voltage drop to the first device = 240mA @ 20m = 0.79V (see table).

3. Voltage at first device = control unit voltage - voltage drop = 13.60 -0.79 = 12.81V.

4. The total current being drawn at the second device = 120mA.

5. Voltage drop to the second device = 120mA @ 20m = 0.38 (see table).

6. Voltage at second node = first device voltage - voltage drop = 12.81 - 0.38 = 12.43V.

Voltage Drop Example 2

The second example in figure 5) shows what happens when a third device is connected 20

metres from the second.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 179 180

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