Current Transducer LA 50-S/SP1
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
=
50 A
0634
Electrical data
Features
I
PN
I
P
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance
with ± 15 V
I
SN
K
N
V
C
I
C
@ ± 50 A
max
@ ± 100 A
max
50
0 .. ± 100
R
M min
R
M max
0
0
25
1 : 2000
± 15
10 +
I
S
330
100
A
A
Ω
Ω
mA
V
mA
•
Closed loop (compensated) current
transducer using the Hall effect
•
Insulated plastic case recognized
according to UL 94-V0.
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
Special features
•
I
P
= 0 .. ± 100 A
•
K
N
= 1 : 2000
Advantages
Accuracy - Dynamic performance data
•
•
•
•
•
•
•
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.
ε
X
G
L
Overall accuracy @
I
PN,
T
A
= 25°C
Linearity error
Offset current @
I
P
= 0,
T
A
= 25°C
Thermal drift of
I
O
Response time
1)
@ 90 % of
I
PN
di/dt accurately followed
Frequency bandwidth (- 1 dB)
± 0.5
< 0.1
Typ
Max
± 0.1
± 0.4
%
%
mA
mA
µs
A/µs
kHz
I
O
I
OT
t
r
di/dt
f
- 10°C .. + 70°C
± 0.2
<1
> 50
DC .. 150
Applications
General data
T
A
T
S
R
S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
T
A
= 70°C
Mass
Standards
- 10 .. + 70
°C
- 25 .. + 85
°C
130
Ω
45
g
EN 50178 : 1997
•
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.
Application domain
Note :
1)
With a di/dt of 50 A/µs.
•
Industrial.
060911/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Page 1/3
LEM
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Current Transducer LA 50-S/SP1....
Isolation characteristics
V
d
V
w
dCp
dCl
CTI
R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn
Impulse withstand voltage 1.2/50 µs
Creepage distance
Clearance distance
Comparative Tracking Index (Group II)
4
>7.4
Min
8.70
7.40
400
kV
kV
mm
mm
Application examples
According to EN 50178 and IEC 61010-1 standards
and following conditions :
•
Over voltage category OV 3
•
Pollution degree PD2
•
Non-uniform field
EN 50178
dCp, dCI,
V
W
Single isolation
Reinforced isolation
Rated isolation voltage
600 V
300 V
IEC 61010-1
Nominal voltage
600 V
300 V
Safety
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 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.
060911/7
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 LA 50-S/SP1
(in mm. 1 mm = 0.0394 inch)
Left view
Front view
Connection
Rep.
A-B
Clearance
7.40 mm
Creepage
8.70 mm
Top view
Mechanical characteristics
•
General tolerance
•
Transducer fastening
Recommended fastening torque
•
Primary through-hole
•
Connection of secondary
± 0.2 mm
2 holes
∅
3.2 mm
2 M3 steel screws
1.1 Nm or 0.80 Lb.-Ft.
12.7 x 6.35 mm
Molex 5045-04/AG
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.
•
In order to achieve the best magnetic coupling, the primary
windings have to be wound over the top edge of the device.
•
To measure nominal currents of less than 50 A, the optimum
accuracy is obtained by having several primary turns (nomi-
nal current x number of turns < 50 At).
060911/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Page 3/3
LEM
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