M-system LTCNE is an AC current transducer that converts alternating current from a current transformer into a standard process signal. It offers true RMS sensing, requires no auxiliary power source, and provides isolation up to 2000 V AC. With its high-density mounting and conformity to IEC 60688, it is ideal for centralized monitoring and control of motors, pumps, or heaters by DCS, as well as monitoring power line and power supply current.
M-system LTCNE is an AC current transducer that converts alternating current from a current transformer into a standard process signal. It offers true RMS sensing, requires no auxiliary power source, and provides isolation up to 2000 V AC. With its high-density mounting and conformity to IEC 60688, it is ideal for centralized monitoring and control of motors, pumps, or heaters by DCS, as well as monitoring power line and power supply current.
MODEL: LTCNE
Power Transducer Series LT-UNIT
AC CURRENT TRANSDUCER
(Self-powered, RMS sensing)
Functions & Features
• Converts alternating current from a current transformer
into a standard process signal
• Minimum ripple
• True RMS sensing
• No auxiliary power source required
• Isolation up to 2000 V AC
• High-density mounting
• Conforms to IEC 60688
Typical Applications
• Centralized monitoring and control of motors, pumps or
heaters by DCS
• Monitoring power line and power supply current
39
(1.54)
143 (5.63)
111
(4.37)
mm (inch)
MODEL: LTCNE–[1][2][3]
ORDERING INFORMATION
• Code number: LTCNE–[1][2][3]
Specify a code from below for each [1] through [3].
(e.g. LTCNE-1G/T)
[1] INPUT
Current
1: 0 – 1 A AC (used within 0.1 – 1 A)
2: 0 – 2A AC (used within 0.2 – 2 A)
5: 0 – 5 A AC (used within 0.5 – 5 A)
[2] OUTPUT
Current
G: 0 – 1 mA DC (Load resistance 5000 Ω max.)
Voltage
3: 0 – 1 V DC (Load resistance 2000 Ω min.)
4: 0 – 10 V DC (Load Resistance 20 kΩ min.)
5: 0 – 5 V DC (Load resistance 10 kΩ min.)
[3] OPTIONS
Terminal cover
blank: Without
/T: With
GENERAL SPECIFICATIONS
Connection: M4 screw terminals (torque 1.2 N·m)
Screw terminal: Chrome-plated steel
Housing material: Flame-resistant resin (black)
Isolation: Input to output
Input waveform: Up to 15 % of 3rd harmonic content
Overrange output: 10 – 120 % at 0 – 5 V
Span adjustment: 95 to 105 % (front)
INPUT SPECIFICATIONS
Frequency: 50 or 60 Hz
Operational range: 10 – 120 % of rating
Overload capacity: 4000 % of rating for 1 sec., 2000 % for 4
sec., 120 % continuous
Input burden: 2 VA
CURRENT [%]
5
2000 4000
10
0
TIME [s]
• Overload Capacity
OUTPUT SPECIFICATIONS
■OPERATION DIAGRAM
50 100
IN %
0
50
OUT %
100
10
0
Note: The described accuracy is not assured within 0 –10%
of the rating, though output signal exists.
INSTALLATION
Operating temperature: -10 to +55°C (14 to 131°F)
Operating humidity: 30 to 85 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 300 g (0.66 lbs)
Rugghölzli 2
CH - 5453 Busslingen
Tel. +41 (0)56 222 38 18
Fax +41 (0)56 222 10 12
www.sentronic.com
Produkte, Support und Service
SEN
TRONIC
AG
MODEL: LTCNE
PERFORMANCE in percentage of span
Accuracy: ±0.5 % (at 23°C ±10°C or 73.4°F ±18°F,
45 – 65 Hz)
Magnetic field (ext. origin) effect: ± 0.5 % (400 A/m)
Response time: ≤ 2 sec. (0 – 100 % ±1 %)
Ripple: 0.5 %p-p max.
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 2000 V AC @1 minute
(input to output to ground)
Impulse withstand voltage: 1.2 / 50 μsec., ±5 kV
(input to output or ground)
STANDARDS & APPROVALS
IEC Standard: IEC 60688
CONNECTION DIAGRAM
4
5
LOAD
SOURCE
k
l
CT
L
K
1
2
+
–
OUTPUT
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)
5
4
6 7
1 2 3
[4 (.16)]143 (5.63)
DIN RAIL
35mm wide
8 (.31)
27 (1.06)
39 (1.54)
• When mounting, no extra space is needed between units.
98 (3.86)
80 (3.15)
111 (4.37)
2–M4 MTG HOLE
7–M4 SCREW
10 (.39)
3
(.12)
TERMINAL COVER (option /T)
Specifications are subject to change without notice.
Rugghölzli 2
CH - 5453 Busslingen
Tel. +41 (0)56 222 38 18
Fax +41 (0)56 222 10 12
www.sentronic.com
Produkte, Support und Service
SEN
TRONIC
AG
LTCNE
P. 1 / 2EM-3352 Rev.1
AC CURRENT TRANSDUCER
(self-powered)
MODEL
LTCNE
INSTRUCTION MANUAL
BEFORE USE ....
Thank you for choosing M-System. Before use, please check
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.
■ PACKAGE INCLUDES:
Signal conditioner ......................................................... (1)
■ MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
■ INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, including installation, connection and
basic maintenance procedures.
POINTS OF CAUTION
■ GENERAL PRECAUTIONS
• Before you remove or mount the unit, turn off the input
signal for safety.
■ ENVIRONMENT
• Indoor use
•
When heavy dust or metal particles are present in the air,
install the unit inside proper housing with sufficient ven-
tilation.
• Do
not install the unit where it is subjected to continuous
vibration. Do not subject the unit to physical impact.
• Environmental
temperature must be within -10 to +55°C
(14 to 131°F) with relative humidity within 30 to 85% RH
in order to ensure adequate life span and operation.
■ WIRING
•
Do
not install cables (input and output) close to noise
sources (relay drive cable, high frequency line, etc.).
• Do
not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■ AND ....
• The
unit is designed to function as soon as the input sig-
nal is supplied, however, a warm up for 10 minutes is re-
quired for satisfying complete performance described in
the data sheet.
COMPONENT IDENTIFICATION
INSTALLATION
■ DIN RAIL MOUNTING
Set the unit so that its DIN rail adaptor is at the bottom.
Position the upper hook at the rear side of the unit on the
DIN rail and push in the lower. When removing the unit,
push down the DIN rail adaptor utilizing a minus screw-
driver and pull.
■ WALL MOUNTING
Refer to “EXTERNAL DIMENSIONS.”
Connection
Diagram
Span Adjustment
Body
Specifications
DIN Rail
35mm wide
Spring Loaded
DIN Rail Adaptor
Rugghölzli 2
CH - 5453 Busslingen
Tel. +41 (0)56 222 38 18
Fax +41 (0)56 222 10 12
www.sentronic.com
Produkte, Support und Service
SEN
TRONIC
AG
LTCNE
TERMINAL CONNECTIONS
Connect the unit as in the diagram below or refer to the con-
nection diagram on the side of the unit.
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Input:
Check that the input signal is within 10 – 120% of
the full-scale. Be sure to short the secondary side of CT
or turn off the current at its primary side to prevent the
CT from burning when the cables are to be disconnected
from input terminals.
4)
Output:
Check that the load resistance meets the de-
scribed specifications.
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following.
■ HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficient
accuracy level. SPAN is adjustable within ±5%. Apply 100%
input and adjust output to 100%.
MAINTENANCE
Regular calibration procedure is explained below:
■ CALIBRATION
Warm up the unit for at least 10 minutes. Apply 10%, 25%,
50%, 75% and 100% input signal. Check that the output
signal for the respective input signal remains within accu-
racy described in the data sheet. When the output is out of
tolerance, recalibrate the unit according to the “ADJUST-
MENT PROCEDURE” explained earlier.
EXTERNAL DIMENSIONS unit: mm (inch)
4
5
LOAD
SOURCE
k
l
CT
L
K
1
2
+
–
OUTPUT
5
4
6 7
1 2 3
[4 (.16)]143 (5.63)
DIN RAIL
35mm wide
8 (.31)
27 (1.06)
39 (1.54)
• When mounting, no extra space is needed between units.
98 (3.86)
80 (3.15)
111 (4.37)
2–M4 MTG HOLE
7–M4 SCREW
10 (.39)
3
(.12)
TERMINAL COVER (option /T)
Rugghölzli 2
CH - 5453 Busslingen
Tel. +41 (0)56 222 38 18
Fax +41 (0)56 222 10 12
www.sentronic.com
Produkte, Support und Service
SEN
TRONIC
AG
-
1
-
2
-
3
-
4
M-system LTCNE is an AC current transducer that converts alternating current from a current transformer into a standard process signal. It offers true RMS sensing, requires no auxiliary power source, and provides isolation up to 2000 V AC. With its high-density mounting and conformity to IEC 60688, it is ideal for centralized monitoring and control of motors, pumps, or heaters by DCS, as well as monitoring power line and power supply current.
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