Current Transducer LF 205-S
For the electronic measurement of currents : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
I
PN
=
200 A
16135
Electrical data
I
PN
I
P
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance @
with ± 12 V
with ± 15 V
I
SN
K
N
V
C
I
C
@ ± 200 A
max
@ ± 420 A
max
@ ± 200 A
max
@ ± 420 A
max
200
0 .. ± 420
T
A
= 70°C
T
A
= 85°C
R
M min
R
M max
R
M min
R
M max
0
0
0
0
71
14
100
28
0
0
23
23
69
12
98
26
A
A
Features
•
Closed loop (compensated) current
transducer using the Hall effect
•
Insulated plastic case recognized
according to UL 94-V0.
Ω
Ω
Ω
Ω
mA
V
mA
Advantages
•
•
•
•
•
•
•
Excellent accuracy
Very good linearity
Low temperature drift
Optimized response time
Wide frequency bandwidth
No insertion losses
High immunity to external
interference
•
Current overload capability.
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption @ ± 15 V
100
1 : 2000
± 12 .. 15
17 +
I
S
Accuracy - Dynamic performance data
X
G
ε
L
Overall accuracy @
I
PN
,
T
A
= 25°C
Linearity error
Offset current @
I
P
= 0,
T
A
= 25°C
Residual current
1)
@
I
P
= 0, after an overload of 3 x
I
PN
Thermal drift of
I
O
- 40°C .. + 85°C
Reaction time @ 10 % of
I
PN
Response time
2)
@ 90 % of
I
PN
di/dt accurately followed
Frequency bandwidth (- 3 dB)
± 0.5
< 0.1
Max
± 0.2
± 0.1
± 0.12 ± 0.4
< 500
<1
> 100
DC .. 100
Typ
%
%
mA
mA
mA
ns
µs
A/µs
kHz
I
O
I
OM
I
O T
t
ra
t
r
di/dt
f
Applications
•
AC variable speed drives and servo
•
•
•
•
motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies
(UPS)
Switched Mode Power Supplies
(SMPS)
Power supplies for welding
applications.
General data
T
A
T
S
R
S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
T
A
= 70°C
@
T
A
= 85°C
Mass
Standards
- 40 .. + 85
°C
- 40 .. + 90
°C
33
Ω
35
Ω
78
g
EN 50178 : 1997
•
Application domain
•
Industry.
Notes :
1)
2)
The result of the coercive field of the magnetic circuit
With a di/dt of 100 A/µs.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
060522/11
Page 1/3
LEM
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Current Transducer LF 205-S
Isolation characteristics
V
d
V
w
V
e
dCp
dCl
CTI
R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn
Impulse withstand voltage 1.2/50 µs
R.m.s. voltage for partial discharge extinction @ 10pC
Creepage distance
Clearance distance
Comparative Tracking Index (Group III a)
3.5
8.8
>2
Min
11
10.2
175
kV
kV
kV
mm
mm
Application examples
According to EN 50178 and IEC 61010-1 standards
and following conditions :
•
Over voltage category OV 2
•
Pollution degree PD3
•
Non-uniform field
EN 50178
dCp, dCI,
V
w
Single isolation
Reinforced isolation
Rated isolation voltage
500 V
250 V
IEC 61010-1
Nominal voltage
500 V
250 V
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the following
manufacturer's operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-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.
060522/11
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Page 2/3
LEM
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Dimensions LF 205-S
(in mm. 1 mm = 0.0394 inch)
Bottom view
Right view
Front view
Back view
Connection
Top view
Mechanical characteristics
•
General tolerance
•
Transducer fastening
Vertical position
Fastening torque, max
or
± 0.2 mm
2 holes
∅
4.3 mm
2 M4 steel screws
3.2 Nm or 2.37 Lb. - Ft.
4 holes
∅
1.9 mm depth 7 mm
4 x PT KA25 screws long 6 mm
4 holes
∅
4.3 mm
4 M4 steel screws
3.2 Nm or 2.37 Lb. - Ft.
4 holes
∅
1.9 mm
4 x PT KA25 screws
0.7 Nm or 0.52 Lb. - Ft.
∅
15.5 mm
Molex 5045-0.3/A
Remarks
•
I
S
is positive when
I
P
flows in the direction of the arrow.
•
Temperature of the primary conductor should not exceed
100°C.
•
Dynamic performances (di/dt and response time) are best
with a single bar completely filling the primary hole.
•
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
•
Transducer fastening
Horizontal position
Fastening torque, max
or
Fastening torque, max
•
Primary through-hole
•
Connection of secondary
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
060522/11
Page 3/3
LEM
w w w .lem.com
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