The new ABB FOCS Fiber-Optic Current
Sensor is a family of high accuracy sensors
for industrial high current measurement
applications based on the magneto-optic
effect.
ABB FOCS is available for uni- or bi-direc-
tional dc current measurement up to 500 kA.
With corresponding sensor head sizes, it
offers an easily installed, interference-free
alternative to the Hall effect current trans-
ducers.
The Sensor Head is connected to the Sensor
Electronics via a glass sensor fiber cable. This
cable cannot be detached from the Sensor
Electronics.
All data conditioning and monitoring functions
provided by ABB FOCS, including scaling and
calibration, are designed and tested at works.
No software engineering is necessary on site.
ABB FOCS is delivered with standard firmware
installed and ready for operation.
Sensor
Electronics
Control Cubicle (optional)
Sensor Head
Current Carrying
Busbars
Highlights
ABB FOCS is an unique fiber optic current
measurement device designed for simplified
installation, easy commissoning, increased
accuracy, and a digital signal for greatly enhan-
ced data acquisition management and negligi-
ble power consumption.
Sensor Fiber
Cable
ABB FOCS Typical Layout
• Communication with external control
systems:
– ABB PowerLINK, used to interface the
Sensor Electronics with an AC 800PEC
controller by means of fiber optic cables.
Standard optical module UF D128 for plas-
tic optical fiber (POF) or optional optical
module UF D130 for glass optical fiber
(GOF) can be used.
– PROFIBUS DP fieldbus (optional) to con-
nect the Sensor Electronics to any third
party external control system. The Sensor
Electronics operates as PROFIBUS DP
slave.
• Ah and kAh counter pulses: 100 Ampere-
hour and 1 kilo Ampere-hour pulses via
PROFIBUS and PowerLINK.
• DC-current protection
– Instantaneous overcurrent detection
– Inverse time overcurrent detection
– Reverse current detection.
• 3 status relays with changeover contacts.
• Degree of protection
– Sensor Electronics: IP00, always to be
mounted in a control
cubicle
– Sensor Head:
Not applicable, to be
protected against rain
and sunlight.
• Emitted noise:
<55 dB (A).
Models and Ratings
Main Type Code
kA
20
30
45
60
80
100
130
155
180
225
260
300
350
400
450
500
Measuring range
in kA
ABB FOCS – 100 – L10
Type
ABB FOCS-20
ABB FOCS-30
ABB FOCS-45
ABB FOCS-60
ABB FOCS-80
ABB FOCS-100
ABB FOCS-130
ABB FOCS-155
ABB FOCS-180
ABB FOCS-225
ABB FOCS-260
ABB FOCS-300
ABB FOCS-350
ABB FOCS-400
ABB FOCS-450
ABB FOCS-500
Length of sensor
fiber cable in
meters (10–70 m)
Performance
• Measuring range: 0 to ± 500 kA (depending
on type), 20 % overcurrent capacity.
• Accuracy (1 to 120 % of rated current):
± 0.1 % of the measured value.
• Repeatability: ± 0.02 %.
• Linearity (1 to 120 % of rated current): ± 0.1 %.
• Sampling rate: 4 kHz.
• Temperature sensitivity: <± 0.002 % / °C.
Power Supply
• Redundant 24 Vdc input, –15 %, +20 %.
• Power consumption: <60 W.
Ambient Requirements
• Operating temperature
– Sensor Head: –40 to +80 °C.
– Sensor Electronics:
–25* to +65 °C (mounted in a cubicle with
forced air cooling)
–25* to +55 °C (with natural air
convection).
*
With PROFIBUS module: min. temp. 0 °C.
• Storage temp.:
–40 to +70 °C.
• Humidity:
RH=5-95 % (compliance
with standard EN 61131-2).
• Pollution degree: Degree 2 (compliance with
standard IEC 60664).
• Altitude:
≤
4000 m (compliance with
standard IEC 60068-2-13).
Features
• Available in different standard dimensions,
according to the dimensions of the busbar
(see Physical Dimensions).
• Sensor Electronics galvanically separated
from Sensor Head and current busbar.
• Optional control cubicle with optional
Process Panel PP210.
• Sensor Electronics mounted on standard DIN
rails.
• Two analog outputs corresponding to the
measured dc current with selectable combi-
nations:
– 0...20 mA and 0...1 V, unidirectional
– 4...20 mA and 0.2...1 V, unidirectional
– ± 20 mA and ± 1 V, bidirectional.
Accessories Type Code
Auxiliary supply
0
24 Vdc from plant mains supply
1
Variable (85 – 264 Vac, 47 – 65 Hz / 90 – 350 Vdc),
additional power supply
2
Special on request
PowerLink
0
UF D128 (POF)
1
UF D130 (GOF)
Profibus DP
00
None
10
Slave module
11
Slave module + OLM/P12 (POF)
12
Slave module + OLM/G12 (GOF)
ABB FOCS Measuring Principle
The sensor consists of a single-ended optical
fiber and the Sensor Electronics, including light
source, optical detection circuit and digital sig-
nal processor. One sensing fiber loop is moun-
ted around the current carrying busbar.
The measured signal is independent of the par-
ticular busbar arrangement and insensitive to
magnetic stray fields from neighboring busbars.
The Sensor Electronics is galvanically isolated
from the Sensor Head and the busbars.
ASVn – PLn – PBmn – CCmn opq – PNLn
Wall mounted control cubicle
00000
None
11111
Standard
Any 2
Customized
m
n
o
p
q
Type of control cubicle
Color for control cubicle
Lock type
Size of control cubicle
Cable Entry
Process panel
0 None
1 Process Panel 210
2
3
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25.01.2005 09:34:18
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