Network Control and Monitoring
44
Add network power
– Many devices such as sensors and relays can be powered directly
from the network. However, inverters generally use much more power and a higher input
voltage than a network could provide. As demonstrated by the installation powerup test,
SJ100DN Series inverters need only the AC input power for stand-alone operation. For
network monitoring or control, you must also supply ex24V network power to
the DeviceNet connector. The inverter has internal optical isolation from the network,
and draws negligible network power as a result. DeviceNet specifications support up to
8A per network segment.
NOTE:
Class II NEC Code limits the current for any network segment to 4A. DeviceNet
thick
type cable is limited to 8A;
thin
type cable is limited to 3A.
Add a +24VDC supply to the network as shown below. It is not necessary to power it for
this step; later steps will provide powerup instructions.
Alternatively, you can use the auxiliary network power connector as shown below (left).
The inverter internally connects the two connectors to pass through network power.
L 3
1
2
P24 CM2 12 11
DeviceNet Supply
CANbus High
CANbus Low
Drain
Bus supply –
Bus
(Bare)
(Red)
(White)
(Blue)
(Black)
+
–
24VDC
L 3
1
2
P24 CM2 12 11
DeviceNet network
connector
Auxiliary network
power connector
Internal
connections
Bus supply –
Bus
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