Rockwell Automation DeviceNet Media Design Installation Guide - Manual (Page 94)

Publication DNET-UM072C-EN-P - July 2004
4-16 Determine Power Requirements
.
Two power supplies (end-connected) in parallel with no V+ break
The following example uses the look-up method to determine the
configuration for two end-connected power supplies. You must use diodes at
the power taps to prevent back-feeding of the power supplies. Check your
national and local codes for any restrictions on the use of parallel power
supplies. The NEC/CECode requires that the power supplies must be listed
for parallel operation.
IMPORTANT
To use this configuration, you must make the following
PowerTap tap modifications:
• place no loads between the PowerTap taps
• remove fuses between the two PowerTap taps to
segment the V+ conductor in the trunk line between
the taps
• cut V+ (red) flush with cable jacket
remove
these
fuses
power
supply
power
supply
V+ V-
V- V+
CAN_H
CAN_L
drain
V+
V-
trunk line
ground
Wire
Color Wire
identity Use
white CAN_H signal
blue CAN_L signal
bare drain shield
black V- power
red V+ power
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