Cooper Security i-on 16 Guia do Utilizador descarregar pdf (Página 14)

i-on30EX

Page 10

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

Reducing Voltage Drop - Method 1:

Double up the supply connections (12V and

0V), which will halve the resistance on each

core and therefore halve the voltage drop.

When using Table 1 to calculate the

expected voltage drop, simply divide the

voltage drop for a single core by two.

Reducing Voltage Drop - Method 2:

Supply the detection devices from the Aux

output on separate cores. This is the

preferred method of reducing voltage drop

as detectors generally operate at lower

voltages (9.5V). When using this method,

the bus cable must have two spare cores.

Remote Power Supplies

When you cannot reduce voltage drops by

method 1 or 2, or the demand on the

control unit power supply exceeds its

capacity (see Technical Specifications –

page 28), you should install one or more

remote power supplies. The supply must

have a "floating zero rail" if connected to

the bus, otherwise an earth fault will occur.

Cooper Security recommend the EXP-PSU.

When installing a remote power supply, fit

it close to the equipment it is powering.

Figure 11 shows the recommended method

of connecting a remote power supply.

Figure 11. Connecting Remote Power Supply Units

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 35 36

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