Rockwell Automation 57C402 25-115V AC/DC Low Power Output Module - Manual (Page 9)

2Ć1
2.0 MECHANICAL/ELECTRICAL
DESCRIPTION
The following is a description of the faceplate LEDs, field termination
connectors, and electrical characteristics of the field connections.
2.1 Mechanical Description
The output module is a printed circuit board assembly that plugs into
the backplane of the DCS 5000/AutoMax rack. It consists of a printed
circuit board, a faceplate, and a protective enclosure. The faceplate
contains tabs at the top and bottom to simplify removing the module
from the rack. Module dimensions are listed in Appendix A.
The faceplate of the module contains a female connector socket and
16 LED indicators that show the status of the outputs. Output signals
leave the module via a multiĆconductor cable (M/N 57C370; see
Appendix D). One end of this cable attaches to the faceplate
connector, while the other end of the cable has stakeĆon connectors
that attach to a terminal strip for easy field wiring. The faceplate
connector socket and cable plug are keyed to prevent the cable from
being plugged into the wrong module.
On the back of the module are two edge connectors that attach to
the system backplane.
2.2 Electrical Description
The output module contains 16 output circuits for 24Ć115 volt control
signals. Each group of four circuits shares a single isolated common.
Output signals have 2500 volt isolation to logic common. Refer to the
block diagram in Appendix B.
Each output circuit consists of a full wave bridge rectifier with the load
connected to the AC side and a power FET on the DĆC side. The
gate circuit of the FET is transformerĆisolated from the output buffer. A
circuit diagram is shown in figure 2.1.
RECTIFIER FROM
OUTPUT
BUFFER
FROM
OSCILLATOR
OUTPUT
130V
FET
ISOLATOR
Figure 2.1 Ć Typical Output Circuit