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Current Transducer LF 305-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).
IPN
=
300 A
16167
Electrical data
I PN IPM RM Primary nominal current rms Primary current, measuring range Measuring resistance with 12 V with 15 V with 20 V ISN KN VC IC @ 300 A max @ 500 A max @ 300 A max @ 500 A max @ 300 A max @ 500 A max 300 0 .. 500 RM mini RM maxi 0 0 0 0 15 15 39 12 58 22 93 45 A A
Features
* Closed loop (compensated) current * Isolated plastic case recognized
according to UL 94-V0. transducer using the Hall effect
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 current rms Conversion ratio Supply voltage ( 5 %) Current consumption
150 mA 1 : 2000 12 .. 20 V 26 (@ 20V) + IS mA
Accuracy - Dynamic performance data
XG
L
Overall accuracy @ IPN , T A = 25C Linearity error Offset current @ IP = 0, T A = 25C Magnetic offset current 1) @ IP = 0 and specified RM, after an overload of 3 x IPN Temperature variation of IO - 10C .. + 70C Reaction time @ 10 % of IPN Response time 2) to 90 % of IPN step di/dt accurately followed Frequency bandwidth (- 1 dB)
0.4 < 0.1 Typ Maxi 0.20
% % mA
Applications
* AC variable speed drives and servo
mA mA ns s A/s kHz motor drives
IO I OM IOT tra tr di/dt BW
0.08 0.1 0.30 < 500 <1 > 100 DC .. 100
* Static converters for DC motor drives * Battery supplied applications * Uninterruptible Power Supplies * Switched Mode Power Supplies * Power supplies for welding
applications. (SMPS) (UPS)
General data
TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ T A = 70C Mass Standards - 10 .. + 70 C - 25 .. + 85 C 25 95 g EN 50178: 1997
Application domain
* Industrial.
Notes:
1) 2)
The result of the coercive field of the magnetic circuit With a di/dt of 100 A/s.
page 1/3
061031/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Current Transducer LF 305-S
Isolation characteristics
Vd Vw dCp dCl CTI Rms voltage for AC isolation test, 50/60 Hz, 1 mn Impulse withstand voltage 1.2/50 s Creepage distance Clearance distance Comparative Tracking Index (Group II) 3.8 10 11.9 11.5 175 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, VW Single isolation Reinforced isolation Rated isolation voltage 1000 V 500 V IEC 61010-1 Nominal voltage 1000 V 500 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.
page 2/3
061031/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Dimensions LF 305-S
(in mm. 1 mm = 0.0394 inch)
Connection Bottom view
Right view
Back view
Top view
Mechanical characteristics
* General tolerance * Transducer fastening
Vertical position Recommended fastening torque or Recommended fastening torque Flat lying position Recommended fastening torque or Recommended fastening torque 0.5 mm 2 holes 4.3 mm 2 steel screws M4 3.2 Nm or 2.37 Lb.-Ft. 4 holes 1.9 mm, depth : 7 mm 4 screws PTKA 25, length: 6 mm 0.7 Nm or 0.52 Lb.-Ft. 4 holes 4.3 mm 4 steel screws M4 2.9 Nm or 2.14 Lb.-Ft. 4 holes 1.9 mm, crossing 4 screws PTKA 25, length:10 mm 0.75 Nm 0.55 Lb.-Ft. 20 mm Molex 5045-03/A
Remarks
* IS is positive when IP flows in the direction of the arrow * Temperature of the primary conductor should not exceed * Dynamic performances (di/dt and response time) are best * This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...), please contact us. with a single bar completely filling the primary hole 100C
* Primary through-hole * Connection of secondary
page 3/3
061031/7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com

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