LA25-SP11 Datasheet, PDF (1/2 Pages) LEM – Current Transducer

Current Transducer LA 25-NP/SP11
For the electronic measurement of currents : DC, AC, pulsed,
mixed, with a galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
I_PN = 1 A
Electrical data
16095
I_PN
Primary nominal r.m.s. current
I_P
Primary current, measuring range
R_M Measuring resistance
with ± 15 V
@ ± 1.0 A
max
@ ± 1.5 A _max
I_SN
Secondary nominal r.m.s. current
K
Conversion ratio
N
V_C Supply voltage (± 5 %)
I
Current consumption
C
V_d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
V
R.m.s. rated voltage ¹⁾, safe separation
b
basic isolation
Accuracy - Dynamic performance data
1
A
0 .. ± 1.5
A
R_{M min}
R_{M max}
100 320 Ω
100 190 Ω
25
mA
25 : 1000
± 15
V
10 + I
mA
S
2.5
kV
600
V
1700
V
Features
• Closed loop (compensated) multi-
turns current transducer using the
Hall effect
• Insulated plastic case recognized
according to UL 94-V0.
Special features
• I_PN = 1 A
• I_P = 0 .. ± 1.5 A
• K _N = 25 : 1000.
Advantages
X
ε
Typical accuracy @ I_PN , T_A = 25°C
Linearity
L
± 0.5
< 0.2
% • Excellent accuracy
% • Very good linearity
Typ Max
• Low temperature drift
I_O
I_OM
I_OT
Offset current ²⁾ @ I_P = 0, T_A = 25°C
± 0.05 ± 0.15 mA
Residual current ³⁾ @ I_P = 0, after an overload of 3 x I_PN ± 0.05 ± 0.15 mA
Thermal drift of I_O
0°C .. + 25°C ± 0.06 ± 0.25 mA
+ 25°C .. + 70°C ± 0.10 ± 0.35 mA
• Optimized response time
• Wide frequency bandwidth
• No insertion losses
• High immunity to external
interference
t_r
Response time ⁴⁾ @ 90 % of I_{P max}
<1
µs _{• Current overload capability.}
f
Frequency bandwidth (- 1 dB)
DC .. 150 kHz
General data
T
Ambient operating temperature
A
T_S
Ambient storage temperature
R
Primary coil resistance @ T = 25°C
P
A
R _S Secondary coil resistance @ T_A = 70°C
L
Primary insertion inductance
P
R _IS Isolation resistance @ 500 V, T_A = 25°C
m
Mass
Standards
0 .. + 70
°C
- 25 .. + 85
°C
< 51
mΩ
110
Ω
31
µH
> 1500
MΩ
22
g
EN 50178 : 1997
Notes : ¹⁾ Pollution class 2
2) _{Measurement carried out after 15 mn functioning}
3) _{The result of the coercive field of the magnetic circuit}
4) _{With a di/dt of 100 A/µs.}
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.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
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LEM
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