Introduction Engineering Manual
18
Figure 7. Reducing Voltage Drop - Methods 1 & 2
Remote Power Supplies
When voltage drops cannot be overcome by using the two methods previously described or
the demand on the control panel power supply exceeds its capacity (as documented in the
panel's Installation Instructions), one or more remote power supplies will need to be installed.
The supply must have a "floating zero rail" if connected to the network, otherwise an earth fault
will occur. It is also recommended that a monitored power supply is used. The MSPSU meets
both of these requirements. When installing a remote power supply, it should be installed close
to the equipment it is powering.
Figure 8 shows two methods of installing a remote power supply. When connected as shown in
method 1, only the last two nodes have sufficient voltage levels. If the power supply is
repositioned so that it is next to node 3, the voltage levels at each node is increased because
the current being drawn is split into two separate paths and therefore the voltage drop in each
path is reduced. Method 2 is the preferred connection method.
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