Current Transducer LA 305-S/SP6 IPN = 300 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).
Electrical data
IPN Primary nominal r.m.s. current 300 A Features
IP Primary current, measuring range 0 .. ± 800 A • Closed loop (compensated) current
RM Measuring resistance @ TA = 70°C TA = 85°C transducer using the Hall effect
RM min RM max RM min RM max • Insulated plastic case recognized
with ± 15 V @ ± 300 A max
0 91 0 86 Ω according to UL 94-V0.
@ ± 500 A max
0 25 0 20 Ω
with ± 24 V @ ± 300 A max
15 200 20 195 Ω Special features
@ ± 800 A max
15 30 20 25 Ω • IP = 0 .. ± 800 A
ISN Secondary nominal r.m.s. current 75 mA • K N = 1 : 4000
KN Conversion ratio 1 : 4000 • VC = ± 15 .. 24 (± 5 %) V
VC Supply voltage (± 5 %) ± 15 .. 24 V • Connection to secondary circuit on
IC Current consumption 20 (@ ± 15 V) + IS m A 3 M4 threaded studs
Vb R.m.s. rated voltage 1), safe separation 1750 V • Potted
basic isolation 3500 V • Railway equipment.
Accuracy - Dynamic performance data Advantages
XG Overall accuracy @ IPN , TA = 25°C ± 0.8 % • Excellent accuracy
ε L
Linearity < 0.1 % • Very good linearity
• Low temperature drift
Typ Max
• Optimized response time
IO Offset current @ IP = 0, TA = 25°C ± 0.15 mA
• Wide frequency bandwidth
I OM Residual current 2) @ IP = 0, after an overload of 3 x IPN ± 0.25 mA
• No insertion losses
IOT Thermal drift of IO - 25°C .. + 85°C ± 0.08 ± 0.25 mA
• High immunity to external
tra Reaction time @ 10 % of IPN < 500 ns interference
tr Response time 3) @ 90 % of IPN <1 µs • Current overload capability.
di/dt di/dt accurately followed > 100 A/µs
f Frequency bandwidth (- 3 dB) DC .. 100 kHz Applications
• AC variable speed drives and servo
General data motor drives
TA Ambient operating temperature - 25 .. + 85 °C • Static converters for DC motor drives
TS Ambient storage temperature - 40 .. + 90 °C • Battery supplied applications
RS Secondary coil resistance @ TA = 70°C 80 Ω • Uninterruptible Power Supplies
TA = 85°C 85 Ω (UPS)
m Mass 260 g • Switched Mode Power Supplies
Standards 4) EN 50155 (SMPS)
• Power supplies for welding
Notes : 1)
Pollution class 2. With a non insulated primary bar which fills the applications.
through-hole
2)
The result of the coercive field of the magnetic circuit
3)
With a di/dt of 100 A/µs
4)
A list of corresponding tests is available.
021213/4
LEM Components w w w.lem.com
Dimensions LA 305-S/SP6 (in mm. 1 mm = 0.0394 inch)
Front view Left view
Raccordement
Top view
Mechanical characteristics
Remarks
• General tolerance ± 0.5 mm
• Transducer fastening 2 holes ∅ 5.5 mm • IS is positive when IP flows in the direction of the arrow.
2 M5 steel screws • Temperature of the primary conductor should not exceed
Fastening torque, max. 4 Nm or 2.95 Lb. - Ft. 100°C.
• Primary through-hole 25.5 x 25.5 mm • Dynamic performances (di/dt and response time) are best
• Connection to secondary M4 threaded studs with a single bar completely filling the primary hole.
Fastening torque 1.2 Nm or .88 Lb - Ft
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
