LA50-SP1 [LEM]
Current Transducer; 电流传感器
LEM 
Current Transducer LA 50-S/SP1
IPN = 50 A
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).
0634
Electrical data
Features
IPN
IP
RM
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance
50
A
A
· Closed loop (compensated) current
transducer using the Hall effect
· Insulated plastic case recognized
according to UL 94-V0.
0 .. ± 100
RM min RMmax
with ± 15 V
@ ± 50 A max
@ ± 100 A max
0
0
330
100
W
W
ISN
KN
VC
IC
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
25
1 : 2000
± 15
mA
Special features
V
mA
· IP
= 0 .. ± 100 A
10 + IS
· KN = 1 : 2000
Advantages
Accuracy - Dynamic performance data
· Excellent accuracy
· Very good linearity
X
Overall accuracy @ IPN, TA = 25°C
Linearity error
± 0.5
< 0.1
%
%
eG
· Low temperature drift
· Optimized response time
· Wide frequency bandwidth
· No insertion losses
· High immunity to external
interference
L
Typ Max
IO
IOT
Offset current @ IP = 0, TA = 25°C
Thermal drift of IO
± 0.1 mA
- 10°C .. + 70°C
± 0.2 ± 0.4 mA
tr
Response time 1) @ 90 % of IPN
< 1
> 50
DC .. 150
µs
A/µs
kHz
· Current overload capability.
di/dt di/dt accurately followed
f
Frequency bandwidth (- 1 dB)
Applications
General data
· AC variable speed drives and servo
motor drives
TA
TS
RS
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @ TA = 70°C
Mass
- 10 .. + 70
- 25 .. + 85
130
°C
°C
W
g
· Static converters for DC motor drives
· Battery supplied applications
· Uninterruptible Power Supplies
(UPS)
45
Standards
EN 50178 : 1997
· Switched Mode Power Supplies
(SMPS)
· Power supplies for welding
applications.
Application domain
· Industrial.
1)
Note :
With a di/dt of 50 A/µs.
060911/7
Page 1/3
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
LEM
www.lem.com
Current Transducer LA 50-S/SP1....
Isolation characteristics
Vd
Vw
R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn
Impulse withstand voltage 1.2/50 µs
4
>7.4
kV
kV
Min
dCp
dCl
CTI
Creepage distance
Clearance distance
Comparative Tracking Index (Group II)
8.70
7.40
400
m m
m m
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
Rated isolation voltage
600 V
IEC 61010-1
Nominal voltage
600 V
VW
dCp, dCI,
Single isolation
Reinforced isolation
300 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
Page 2/3
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
LEM
www.lem.com
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
Remarks
· General tolerance
· Transducer fastening
± 0.2 mm
· IS is positive when IP 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).
2 holes Æ 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
Recommended fastening torque
· Primary through-hole
· Connection of secondary
060911/7
Page 3/3
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
LEM
www.lem.com
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