AMCI NEXUS NX2A4E2, Руководство пользователя

Страница: 35 / 76

20 Gear Drive, Plymouth Ind. Park, Terryville, CT 06786

Tel: (860) 585-1254 Fax: (860) 584-1973 http://www.amci.com
NX2A4E2 User Manual
I
NSTALLING THE
NX2A4E2
35
1.4 Power Wiring
The NX2A4E2 accepts 24 Vdc as its input power. The input range is 18 to 30Vdc. Maximum power draw is
12 watts, or 0.50 A @ 24Vdc. Minimum wire gauge for the connector is 24 AWG, but a heavier wire gauge is
suggested. The mating connector is included with the NX2A4E2.
The power connector is located on the right side of the unit. Power connections should be tight, as loose con-
nections may lead to arcing which will heat the connector. Phoenix Contact specifies a tightening torque of
4.4 to 5.4 lb-in (0.5 to 0.6 Nm).
The power supply is connected to the pins marked “+” and “–”. The ground pin is used to attach the
NX2A4E2 to earth ground. The use of a 12 AWG, stranded wire for the earth ground connection is strongly
recommended.
Figure T1.5 Power Supply and Grounding Connections
1.5 Network Connections
As shown in the figure below, the NX2A4E2 modules have two Ethernet ports. An internal two port Ethernet
switch connects the two. In non-redundant applications, either port can be used to attach the module to the
network. The remaining port can be used to extend the network to another device if this would reduce wiring
costs.
Figure T1.6 Network Port Locations
1.5.1 EtherNet/IP DLR Applications
In Device Level Ring applications, the NX2A4E2 modules function as Beacon-Based Ring Nodes. In these
applications, both ports are used when wiring the ring, daisy chaining from one unit in the ring to the next.
1.5.2 PROFINET MRP Applications
In Media Redundancy Protocol applications, the NX2A4E2 modules function as a Media Redundancy Client
(MRC). In these applications, both ports are used when wiring the ring, daisy chaining from one unit in the
ring to the next.
NEXUS
RESOLVER
GROUND BUS
+18Vdc to +30Vdc
Isolated Power
Supply
Grounding Strap maybe required by local safety codes.
Strap can be attached without the concern of forming a
ground loop between the supply and NX2A4E2 because the
negative side (–) of the units' power input is isolated
from the chassis ground connection.
Required Functional Grounding Connection.
A 12 AWG, stranded wire must be used to connect
the NX2A4E2 to the system’s ground bus.
NEXUS
RESOLVER
LINK2
PORT 2 PORT 1
MS
NS LINK1
1 2 3 4 5 6 7 8