Schweitzer Engineering Laboratories, Inc.
SEL-2243 Data Sheet
Every SEL Axion
®
node requires at least one SEL-2243 Power Coupler module. The SEL-2243 serves two purposes in
an Axion system:
1.
It is the power supply for all modules installed in the node, and;
2.
It provides two dedicated EtherCAT
®
ports so that multiple Axion nodes can operate together.
Front Panel
Figure 1
SEL-2243 Front Panel With RJ45 Connectors
Power Supply Operation
One SEL-2243 has sufficient power capacity to accom-
modate an entire Axion node. The terminal strip at the
bottom of the unit, as seen in
Figure 1
, is the connection
point for incoming power. All Axion modules have a
55-position IEC C
-
style connector that provides a com-
munications and power interface to the backplane. The
SEL-2243 provides power to the node via the backplane
connector.
The power coupler module uses the same power supply
design that you would find in SEL protective relays. The
Axion provides test-proven superior performance and
availability, while also allowing for redundant power
couplers in a node for applications that need these. If you
install two power couplers in a node, both modules
actively share load and provide the necessary power for
node functions. If one SEL-2243 becomes unavailable,
there is zero switching delay or power loss to the node.
EtherCAT Operation
Each SEL-2243 provides two dedicated ports for Ether-
CAT networks. The ports will either be standard
10/100BASE
-
T or optional 100BASE
-
FX Ethernet ports.
EtherCAT is a real-time fieldbus protocol (see
Appendix E
in the
AC
SEL
ERATOR
RTAC SEL-5033
Instruction Manual
) that we can use to connect an RTAC
to I/O modules in an Axion system. If the installation has
only one node, then the backplane transmits EtherCAT
messages. Alternatively, if you use an SEL-3530 RTAC,
or if you need more I/O than will fit in a node, then the
ports on a power coupler module provide a mechanism
for extending the EtherCAT network through the use of
dedicated Ethernet wiring. Refer to
EtherCAT
in
Section 2: Communications
in the
AC
SEL
ERATOR
RTAC
SEL-5033 Instruction Manual
to learn more about con-
figuring a network.
If an Axion node contains two SEL-2243 modules, then
the EtherCAT ports in both power couplers will operate
normally even if one power supply becomes unavailable.
The remaining power supply will serve as the source for
all I/O modules and communications needs.
i5398d
i5695b
SEL-2243 Power Coupler