Cooper Security i-on30EX Installation Manual page 14

Current Cable Length (Standard 7/0.2 alarm cable)
Drawn
10m 20m
60mA 0.10V 0.19V
80mA 0.13V 0.26V
100mA 0.16V 0.32V
120mA 0.19V 0.38V
140mA 0.22V 0.45V
160mA 0.26V 0.51V
180mA 0.29V 0.58V
200mA 0.32V 0.64V
220mA 0.35V 0.70V
240mA 0.38V 0.79V
260mA 0.42V 0.83V
280mA 0.45V 0.90V
300mA 0.48V 0.96V
320mA 0.51V 1.02V
340mA 0.54V 1.09V
360mA 0.58V 1.15V
380mA 0.61V 1.22V
400mA 0.64V 1.28V
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.
Page 10
Table 1. Voltage Drop
30m 40m
0.29V 0.38V
0.38V 0.51V
0.48V 0.64V
0.58V 0.79V
0.67V 0.90V
0.77V 1.02V
0.86V 1.15V
0.96V 1.28V
1.06V 1.41V
1.15V 1.54V
1.25V 1.66V
1.34V 1.79V
1.44V 1.92V
1.55V 2.05V
1.63V 2.18V
1.73V 2.30V
1.82V 2.43V
1.92V 2.56V
Figure 11. Connecting Remote Power Supply Units
50m 60m 70m
0.48V 0.58V 0.67V
0.64V 0.79V 0.90V
0.80V 0.96V 1.12V
0.96V 1.15V 1.34V
1.12V 1.34V 1.57V
1.28V 1.54V 1.79V
1.44V 1.73V 2.02V
1.60V 1.92V 2.24V
1.76V 2.11V 2.46V
1.92V 2.30V 2.69V
2.08V 2.50V 2.91V
2.24V 2.69V 3.14V
2.40V 2.88V 3.36V
2.56V 3.07V 3.58V
2.72V 3.26V 3.81V
2.88V 3.46V 4.03V
3.04V 3.65V 4.26V
3.20V 3.84V 4.48V
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.
i-on30EX
80m 90m 100m
0.77V 0.86V 0.96V
1.02V 1.15V 1.28V
1.28V 1.44V 1.60V
1.54V 1.74V 1.92V
1.79V 2.02V 2.24V
2.05V 2.30V 2.56V
2.30V 2.59V 2.88V
2.56V 2.88V 3.20V
2.82V 3.17V 3.52V
3.07V 3.46V 3.84V
3.33V 3.74V 4.16V
3.58V 4.03V 4.48V
3.84V 4.32V 4.80V
4.10V 4.61V 5.12V
4.35V 4.90V 5.44V
4.61V 5.18V 5.76V
4.86V 5.47V 6.08V
5.12V 5.76V 6.40V