cat_fi-01_ch07_2008_enZasilacze_systemHART.pdf
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© Siemens AG 2007
SITRANS I
supply units and
input isolators
7/2
Product overview
7/3
SITRANS I
7/3
Isolating power supply HART (FSK)
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Transmitter power supply/input isolator
7/8
Output isolator HART (FSK)
You can download all instructions, cata-
logs and certificates for SITRANS I free
of charge at the following Internet
address:
www.siemens.com/sitransi
Siemens FI 01 · 2008
© Siemens AG 2007
Supply units and input isolators
SITRANS I
Product overview
■
Overview
Application
Description
Page
Isolating power HART (FSK)
Isolating power supply for two-wire transmitters
SITRANS I
Isolating power supply HART for rail
mounting, with intrinsically-safe input.
7/3
Transmitter power supply/input isolator
Power supply for two-wire transmitters.
As input isolator for transformation and
electrical isolation of standard signals.
SITRANS I
Transmitter power supply/input isolator
for rail mounting, adaptable to various
applications.
7/5
7
Output isolator HART (FSK)
Output isolator for control of actuators
SITRANS I
Output isolator HART for rail mounting,
with intrinsically-safe output.
7/8
7/2
Siemens FI 01 · 2008
© Siemens AG 2007
Supply units and input isolators
SITRANS I
Isolating power supply HART (FSK)
■
■
Overview
Application
The power supply HART (FSK) is used to supply two-wire trans-
mitters that are operated in intrinsically safe areas. It supports
communication with digital transmitters through a host computer
or HART communicator (hand-held communicator).
■
Design
The output isolator HART (FSK) is comprised of a compact plas-
tic housing (degree of protection IP20) and is equipped with
push-in screw terminals.
• The output isolator is designed for rail mounting (35 mm
(1.37 inch))
• Power is supplied optionally as a flexible low-voltage supply
from a wide-input-range power supply unit (95 to 253 V AC) or
24 V AC/DC (universal current).
• On the front are the LEDs for the power supply status indica-
tion and the communication sockets for HART (FSK) commu-
nication.
• Input, output and power supply are electrically isolated.
The SITRANS I isolating power supply HART (FSK) is used to
supply 2-wire transmitters and was designed for rail mounting
(35 mm (1.37 inch)).
The isolating power supply has an intrinsically safe input from
4 to 20 mA and "Intrinsically safe" type of protection
EEx ia/ib IIB/IIC.
■
Function
Mode of operation
The connected transmitter is supplied intrinsically safe through
a limitation circuit (1), rectifier (2) and a transformer (3). The cur-
rent is mirrored to the output.
For communication with the transmitter, a HART communicator
or HART modem can either be connected across the output re-
sistance (at least 250
■
Benefits
• Power supply status indication through LED on front
• HART (FSK) communication through communication sockets
on the front
• Electrical isolation of input, output and power supply
• Intrinsically safe input circuit
• Designed for rail mounting (35 mm (1.37 inch))
) or to the communication sockets con-
nected in parallel with the output (HK). The three output termi-
nals enable the output circuit to be connected with or without the
internal communication resistance (250
Ω
Ω
).
7
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Mode of operation of isolating power supply HART (FSK), SITRANS I
■
Load
• between +4 and -5
Technical specifications
≤
750
Ω
Input
Input signal
• between -5 and +6
≤
500
Ω
4 ... 20 mA
Communication
Bidirectional transfer of HART sig-
nals
Input resistance
Approx. 320
Ω
Min. voltage available at 20 mA
16 V
• Communication range
3.6 ... 23 mA
Output
Output signal
Input monitoring
• Signal for input short circuit
4 ... 20 mA
23 ... 30 mA
Open circuit voltage
< 24 V
• Signal for open circuit
< 3.6 mA
Characteristic
Linear
7/3
Siemens FI 01 · 2008
© Siemens AG 2007
Supply units and input isolators
SITRANS I
Isolating power supply HART (FSK)
Accuracy
(related to full-scale value of output
signal)
Linearity
Power supply
Functional extra-low voltage
According to DIN 57100,
VDE 0100 Part 410
≤
0.15%
• With safe isolation
≤
50 V AC,
≤
20 V DC
Output signal ripple
U
SS
<1%
• Universal current 24 V AC/DC
24 V AC
15%, 47 ... 63 Hz,
20 ... 32 V DC
±
Rise time T
90
≤
0.3 ms
Influencing effect
• of ambient temperature
• AC voltage
95 ... 253 V AC, 47 ... 63 Hz
≤
0.2%/ 10 K
Power consumption at rated voltage
• < 2.5 W (24 V DC)
•<3VA (24VAC)
• < 3.5 VA (230 V AC)
• of change in load resistance
≤
0.1% / 100%
• of change in supply
≤
0.1% / 10%
Residual ripple within the specified
voltage limits
U
SS
≤
2.5 V
Rated operating conditions
Ambient conditions
Ambient temperature
Electrical isolation between
• Power supply and input
• Power supply and output
• Input and output
-20 ... +65 °C (-4 ... +149 °F)
Storage temperature
-40 ... +85 °C (-40 ... +185 °F)
Functional temperature
-25 ... +70 °C (-13 ... +158 °F)
Certificates
and
approvals
Degree of protection EN 60529
IP20
Intrinsically safe input circuit
Electromagnetic compatibility
• Interference immunity
"Intrinsically safe" type of protection
II (1) G EEx [ia/ib] IIB/IIC
According to EN 50082-2 and
NAMUR NE 21
• EC type test certificate
TÜV 99 ATEX 1498
External
standards
and
guide-
lines
Low-voltage guideline
• Emitted interference
According to EN 50081-1
Design
Construction
According to DIN EN 61010
Compact plastic housing for rail
mounting
Selection and Ordering data
Order No.
Weight
Approx. 0.15 kg (0.33 lb)
SITRANS I isolating power supply HART
(FSK)
Rail mounted to supply two-wire transmitter,
output 4 ... 20 mA,
intrinsically safe input 4 ... 20 mA,
EEx ia/ib IIB/IIC
}
7 N G 4 1 2 2 - 1
7
A 1 0
Dimensions
See „Dimensional drawings“
Enclosure material
PC/GV 25
Electrical connection
Plug-in screw terminals, max
2.5 mm² (0.098 inch²)
7
Power
• 24 V AC/DC (22.5 mm (0.89 inch) width)
}
A
• 95 ... 253 V AC (35 mm (1.38 inch) width)
}
B
}
Available ex stock.
■
Dimensional drawings
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Dimension drawing and connections, isolating power supply HART (FSK), SITRANS I, dimensions in mm (inch)
7/4
Siemens FI 01 · 2008
© Siemens AG 2007
Supply units and input isolators
SITRANS I
Transmitter power supply/input isolator
■
■
Overview
Application
The 7NG4123 transmitter power supply and input isolator is
used for the transformation and electrical isolation of standard
signals. When it is implemented as a transmitter power supply, it
is used for supplying power and transferring signals to two-wire
transmitters.
■
Design
The 7NG4123 transmitter power supply and input isolator is
comprised of a compact plastic housing with degree of protec-
tion IP 20 and is equipped with push-in screw terminals.
• The device is designed for rail mounting (35 mm (1.37 inch))
• Power is supplied optionally as a flexible low-voltage supply
from a wide-input-range power supply unit (95 to 253 V AC) or
24 V AC/DC (universal current).
• On the front are the LEDs for the power supply status indica-
tion and the measuring range switch.
• Input, output and power supply are electrically isolated.
The compact SITRANS I combination power supply for
transmitters / input isolators is used to supply 2-wire transmitters
and was designed for the electrical isolation and transformation
of standard signals.
The required input and output signals are selected with the help
of the measuring range switch on the front.
■
Function
Mode of operation
The input signal is applied to the respective input amplifier and
converted by a microcontroller in accordance with the transfer
function before reaching the output amplifier through an opto-
coupler. The signal is amplified and output again as a standard
signal (current/voltage).
When operating as a transmitter power supply, the connected
transmitter is supplied and the transmitter load current is applied
to the input amplifier (1). The transfer function can be switched
over with the measuring range switch (0/4 to 20 mA, 0/2 to 10 V
to 0/4 to 20 mA, 0/2 to 10 V). Calibration is not necessary be-
cause all characteristics are stored in the microcontroller.
The electrical isolation ensures that the power supply, input cir-
cuits and output circuits are completely decoupled for low-cur-
rent transfer of the measured values.
The measuring range is set with the measuring range switch on
the front.
■
Benefits
• Input signal can be selected (supplying, current or voltage
output)
• Output signal can be selected (current or voltage output)
• Transfer function can be switched over (0/4 to 20 mA,
0/2 to10 V to 0/4 to 20 mA, 0/2 to 10 V)
• Electrical isolation between input, output and power supply
• Power supply status indication through LED on front
7
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Mode of operation of transmitter power supply and input isolator, SITRANS I
7/5
Siemens FI 01 · 2008
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