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 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 35), you should install one or
more remote power supplies. The supply must
have a "floating zero Volt rail" if connected to the
bus, otherwise an earth fault will occur. Eaton’s
Security Business recommends the EXP-PSU.
When installing a remote power supply, fit it close
to the equipment it is powering.
Figure 18 shows the recommended method of
connecting a remote power supply.
Figure
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