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Before You Begin
Menvier40/100
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
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
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 network cable must have at least 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 31), you should install one or more
remote power supplies. The supply must
have a "floating zero Volt rail" if connected
to the network, otherwise an earth fault will
occur. Cooper Security recommend the
EXP-PSU. When installing a remote power
supply, fit it close to the equipment that it
is powering.
Figure 12 shows the recommended method
of connecting a remote power supply.
Figure 12. Connecting Remote Power Supply Units
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