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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).
IPN
=
50 A
Electrical data
IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance with 15 V ISN KN VC IC Vd @ 50 A max @ 100 A max 50 0 .. 100 RM min RM max 0 0 25 1 : 2000 15 10 + IS 3 330 100 A A mA V mA kV
Features
* 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 R.m.s. voltage for AC isolation test, 50 Hz, 1 min
Special features
* IP = 0 .. 100 A * K N = 1 : 2000
Accuracy - Dynamic performance data
XG
Advantages
0.5 < 0.1 Typ Max 0.1 0.4 % % mA mA s A/s kHz
L
Overall accuracy @ IPN, TA = 25C Linearity Offset current @ IP = 0, TA = 25C Thermal drift of IO Response time 1) @ 90 % of IPN di/dt accurately followed Frequency bandwidth (- 1 dB)
IO IOT tr di/dt f
- 10C .. + 70C
0.2
<1 > 50 DC .. 150
* * * * * * *
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.
General data
TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ TA = 70C Mass Standards 2) - 10 .. + 70 - 25 .. + 85 130 45 EN 50178 C C g
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.
Notes :
1) 2)
With a di/dt of 50 A/s A list of corresponding tests is available. 991014/5
LEM Components
w w w .lem.com
Dimensions LA 50-S/SP1
Front view
(in mm. 1 mm = 0.0394 inch)
Left view
Secondary terminals
Terminal Terminal Terminal Terminal + M 0 : : : : supply voltage + 15 V supply voltage - 15 V measure NC
Connection
Top view Mechanical characteristics
* * * *
General tolerance Fastening Primary through-hole Connection of secondary 0.2 mm 2 holes 3.2 mm 12.7 x 6.35 mm Molex 5045-04/AG
Remarks
* IS is positive when IP flows in the direction of the arrow. * Temperature of the primary conductor should not exceed
100C.
* 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 (nominal current x number of turns < 50 At).
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

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