YASKAWA DX200 Instructions Manual page 62

JARCR-XFB01B Board
for DeviceNet
7 Connections for DeviceNet Communications
7.1 Location of Communication Power Supply
(1) How to confirm sufficient power supply capacity
Check the following for each node.
When nodes are located on both sides of the power supply, check
for the nodes on each side.
The graph to be referred to differs depending on the cable type
(thick or thin cable) of the trunk line.
I) Calculate the total current consumption, "A," of all the nodes
located for each side.
II) From the graph, obtain the maximum current, "B," that may
flow to the cable according to the cable type and the distance
from the power supply to the end of trunk line.
III) If A B:
the total current consumption "A" calculated in step I) is equal
to or less than the allowable maximum current "B" obtained in
step II), and the power supply capacity is sufficient for all the
nodes.
IV) When the nodes are located on both sides of the power supply,
repeat steps I) to III) for the nodes on the other side.
(2) Corrective actions
If A > B,
the total current consumption "A" calculated in step I) is more than
the maximum current "B" obtained in step II), so consider the fol-
lowing corrective actions to satisfy the conditions for the required
power supply capacity.
• Move the power supply to the middle of the trunk line, so that
the nodes are located on both sides of the power supply.
• When the nodes are located on both sides of the power
supply, move the power supply to the side where the bigger
power supply capacity is required.
• When a thin cable is used, replace it with a thick cable.
If A > B after having taken these corrective actions, recalculate the power
supply capacity taking the actual arrangement of nodes into consideration.
7-5
165626-1CD
HW1481973
62/70