ABB CC-E converters, CC-U converters Application Information

Application, Approvals and marks

Applications for analog signal processing and correct
solution using CC-E and CC-U converters

Nearly every process includes a control system that receives
data by means of analog signals and then evaluates the data
and sets the respective parameters correspondingly.

When transmitting analog signals numerous problems may
arise which can disturb or even block an ideal behavior of the
process.

Below we have listed some processing problems together
with the respective solutions to solve these problems:

Signal conversion

Sometimes the available signals cannot be processed by the
controller or the actuator. In this case, signal converters are
required to convert the input signal (or different input signals)
to the desired output signal.

Signal amplification

If long lines or high burdens have to be operated, it may be
necessary to amplify the signal. CC analog signal converters
require only low input power and provide high output power.

Thus, there are no restrictions for the converter's position on
the line, i.e. it can be used

− for signal refreshing  at the end of the line (low input

power)

− or for signal amplification  at the beginning of the line

(high output power).

0-10 V0-10 V

Controller

1.

Analog signal converter

(e.g. CC-E or CC-U)

100 m 0-20 mA 100 m 4-20 mA

Measuring sensor

e.g. AC500

2.

Analog signal converter

(e.g. CC-E or CC-U)

Actuator

2CDC 282 013 F0206

Signal separation

Protection against overvoltage

The increased use of micro-electronics make controls much
more sensitive against overvoltages, resulting from lightning
discharges or switching processes. Suppression diodes are
incorporated in the input of the CC analog signal converters
which enable the converters to arrest overvoltages with low
energy level (resulting from switching processes) by them­selves. The products furthermore provide electrical isolation
between input, output and supply circuit for protection of the
controller connected to the output.

Signal filtering

Particularly on long lines or in rough industrial environments
the signals are exposed to high electromagnetic interferences.
The frequency of the coupled interference signals may be in
the range of the common mains frequency (50 Hz) or even much
higher (in case of frequency converters). According to the
specific requirements, analog signal converters are available
which provide reliable suppression of those interferences by
means of an input low-pass filter.

Approvals

A

A

K

E

Marks

a

b

UL 508, CAN/CSA C22.2 No.14

UL 1604 (Class I, Div 2, hazardous locations),
CAN/CSA C22.2 No.213

CB scheme

CCC

CE

C-Tick

CC-E/STD

CC-E I/I

J J J J J J J J J J J J J J

G J G J G J G J J

J J J J J J J J J J J J J J

J J J J J J J J J J J J J J

Protection against ground loops

If components are used which refer to ground, the measuring
signals can be falsified by a so-called ground loop. In this
case, certain parts of the signal are transmitted via earth and
not via the analog transmission line, thus causing incorrect
evaluation of the signal. The electrical isolation between the
input and the output disconnects these ground loops and
thus enables correct signal transmission.

/ILPO

AC

CC-U/STD

CC-U/STDR

CC-E/RTD

CC-U/RTD

CC-U/RTDR

CC-E/TC

CC-U/TC

CC-U/TCR

CC-E/I

CC-E I

CC-U/I

CC-U/V

J J J

J J J

J existing
G existing

for some
devices

j pending

2CDC 1100 69C0 201 11