LF 1010-S Datasheet by LEM USA Inc.

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N°97.J9.60.000.0
Current transducer LF 1010-S IPN = 1000 A
For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation
between the primary and the secondary circuit.
Features
Bipolar and insulated current measurement up to 2.7 kA
Current output
Closed loop (compensated) current transducer
Panel mounting.
Advantages
High accuracy
Very low offset drift over temperature.
Applications
Windmill inverters
Test and measurement
AC variable speed and servo motor drives
Statics converters for DC motors drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications.
Standards
EN 50178: 1997
UL 508: 2010.
Application Domain
● Industrial.
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LF 1010-S
Absolute maximum ratings
Parameter Symbol Unit Value
Maximum supply voltage (working) (−40 … 85 °C) ±UCV±25.2
Primary conductor temperature TB°C 100
Maximum steady state primary current (−40 … 85 °C) IPN A1000
Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum ratings for extended periods may degrade reliability.
UL 508: Ratings and assumptions of certification
File # E189713 Volume: 2 Section: 9
Standards
USR indicates investigation to the Standard for Industrial Control Equipment UL 508.
CNR indicates investigation to the Canadian standard for Industrial Control Equipment CSA C22.2 No. 14-13
Conditions of acceptability
When installed in the end-use equipment, with primary feedthrough potential involved of 600 V AC/DC, consideration shall be
given to the following:
1 - These products must be mounted in a suitable end-use enclosure.
 2-Thesecondarypinterminalshavenotbeenevaluatedforfieldwiring.
3-Low voltage control circuit shall be supplied by an isolating source (such as transformer, optical isolator, limiting
impedance or electro-mechanical relay).
 4-BasedonthetemperaturetestperformedonallSeries,theprimarybarorconductorshallnotexceed100°Cinthe
end use application.
Marking
Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL’s Follow-
Up Service. Always look for the Mark on the product.
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LF 1010-S
Insulation coordination
Parameter Symbol Unit Value Comment
Rms voltage for AC insulation test, 50 Hz, 1 min UdkV 3.8
Impulse withstand voltage 1.2/50 µs ÛWkV 16
Insulation resistance RIS MΩ 200 measured at 500 V DC
Comparative tracking index CTI 600
Application example 1000 V
CAT III, PD2
Reinforced insulation, non
uniform field according to
EN 50178, IEC 61010
Application example 1000 V
CAT III, PD2
Basic insulation, non
uniform field according to
EN 50178, IEC 61010
Case material - - V0 according
to UL 94
Clearance and creepage See dimensions drawing on page 7
Environmental and mechanical characteristics
Parameter Symbol Unit Min Typ Max Comment
Ambient operating temperature TA°C −40 85
Ambient storage temperature TS°C −50 90
Mass mg503
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LF 1010-S
Electrical data
At TA = 25 °C, ±UC = ±24 V, RM = 1 Ω, unless otherwise noted.
Lines with a * in the conditions column apply over the −40 … 85 °C ambient temperature range.
Parameter Symbol Unit Min Typ Max Conditions
Primary nominal rms current IPN A1000 *
Primary current, measuring range IPM A−2700 2700 *
Measuring resistance RMΩ0*Max value of RM is given in figure 1
Secondary nominal rms current ISN A−0.2 0.2 *
Resistance of secondary winding RSΩ29.9
RS (TA) = RS × (1 + 0.004 × (TA + ∆temp−25))
Estimated temperature increase @IPN is
∆temp = 15 °C
Secondary current ISA−0.54 0.54 *
Number of secondary turns NS5000
Theoretical sensitivity Gth mA/A 0.2
Supply voltage ±UCV±14.25 ±25.2 *
Current consumption ICmA 44 + IS
49 + IS
±UC = ±15 V
±UC = ±24 V
Offset current, referred to primary IOA−1 1
Temperature variation of IO,
referred to primary IOTA−0.6 0.6 *
Magnetic offset current,
referred to primary IOM A±1 After 3 × IPN
Sensitivity error εG%−0.15 0.15 *
Linearity error εL% of IPN −0.15 0.15 *
Overall accuracy at IPN XG% of IPN
−0.2
−0.4
0.2
0.4
*
25 … 70 … 85 °C
−40 … 85 °C
Output rms current noise referred
to primary Ino mA 50 1 Hz to 20 kHz (see figure 4)
Reaction time @ 10 % of IPN tra µs < 0.5 0 to 1 kA, 200 A/µs
Step response time to 90 % of IPN trµs < 0.5 0 to 1 kA, 200 A/µs
Frequency bandwidth BW kHz 200 −3 dB, small signal bandwidth
(see figure 5)
Definition of typical, minimum and maximum values
Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown
in “typical” graphs.
On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower
limits and a probability for measured values to lie within this interval.
Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the
probability for values of samples to lie in this interval is 99.73 %.
For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are not
obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an
interval between −sigma and +sigma for a normal distribution.
Typical, minimum and maximum values are determined during the initial characterization of the product.
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LF 1010-S
100101102103104105106
−130
−120
−110
−100
−90
−80
−70
−60
f
c
(Hz)
eno (dBVrms/Hz
1/2
)
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
−4
10
−3
10
−2
10
−1
10
0
rms
I
no referred to primary (A
rms
)
(Hz)
f
c
Figure 1: Maximum measuring resistance
IP
RM max = NS ×RS max− 0.93 Ω
UC min − 0.5 V
Figure 3: Typical noise voltage density eno
with RM = 100 Ω
Figure 4: Typical total output current noise with
RM = 100 Ω (primary referred, rms)
To calculate the noise in a frequency band f1 to f2, the formula
is:
with Ino (f) read from figure 4 (typical, rms value).
Example:
What is the noise from 1 to 106 Hz?
Figure 4 gives Ino (1 Hz) = 0.5 mA and Ino (106 Hz) = 199 mA.
The output current noise (rms) is therefore:
Ino (f1f2) = Ino (f2)2Ino (f2)2
(199 × 10−3)2 − (0.5 × 10−3)2 = 199 mA referred to primary
Figure 2: Typical step response (0 to 1 kA, 200 A/µs)
015
Time (µs)
30 45
Input 200 A/div
Output 40 mA/div
Typical performance characteristics
0
20
40
60
80
100
120
700 1000 1300 1600 1900 2200 2500 2800
R
Mmax
()
I
P
(A)
22.8 V & 85 °C
14.25 V & 85 °C
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LF 1010-S
Sensitivity and linearity
To measure sensitivity and linearity, the primary current (DC) is
cycled from 0 to IPM, then to IPM and back to 0 (equally spaced
IPM/10 steps).
The sensitivity G is defined as the slope of the linear regression
line for a cycle between ±IPM.
The linearity error εL is the maximum positive or negative
difference between the measured points and the linear
regression line, expressed in % of the maximum measured
value.
Magnetic offset
The magnetic offset IOM is the change of offset after a given
current has been applied to the input. It is included in the linearity
error as long as the transducer remains in its measuring range.
Electrical offset
The electrical offset current IOE is the residual output current
when the input current is zero.
Figure 5: Typical frequency response, small signal bandwidth
Performance parameters definition
Overall accuracy
The overall accuracy XG is the error at ±IPN, relative to the rated
value IPN.
It includes all errors mentioned above.
Response and reaction times
The response time tr and the reaction time tra are shown in the
next figure.
Both slightly depend on the primary current di/dt. They are
measured at nominal current.
Figure 6: Response time tr and reaction time tra
S
t
r
t
ra
t
90 %
10 %
100
%
I
P
I
Typical performance characteristics
-24
-21
-18
-15
-12
-9
-6
-3
0
3
6
110 100 1000
Gain (dB)
Frequency (kHz)
-90
-45
0
45
90
110 100 1000
Phase (deg)
Frequency (kHz)
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LF 1010-S
Mechanical characteristics
General tolerance ±0.5 mm
Transducer fastening
Vertical position 2 holes 5.3 mm
2 M5 steel screws
Recommended fastening torque 3.2 N·m (±10 %)
Or 4 holes 4.2 mm
4 M4 steel screws
Recommended fastening torque 2.1 N·m (±10 %)
Primary through-hole 38 mm
Or 40 mm × 13 mm
Transducer fastening
Horizontal position 4 holes 5.3 mm
4 M5 steel screws
Recommended fastening torque 3.2 N·m (±10 %)
Connection of secondary Molex 6410
Remarks
IS is positive when IP flows in the direction of arrow.
The secondary cables also have to be routed together all
the way.
Installation of the transducer is to be done without primary
current or secondary voltage present.
Maximum temperature of primary conductor: see page 2.
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us
Installation of the transducer must be done unless otherwise
specified on the datasheet, according to LEM Transducer
Generic Mounting Rules. Please refer to LEM document
N°ANE120504 available on our Web site: Products/
Product Documentation.
Safety
This transducer must be used in limited-energy secondary
circuits according to IEC 61010-1.
This transducer must be used in electric/electronic equipment
with respect to applicable standards and safety requirements
in accordance with the manufacturer’s operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module
can carry hazardous voltage (eg. primary connection, power
supply).
Ignoring this warning can lead to injury and/or cause serious
damage.
This transducer is a build-in device, whose conducting parts
must be inaccessible after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
Connection
I
P
I
S
R
M
+UC
UC
dCI dCp
Dimensions (in mm)

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