LA25-NPSP7 Datasheet, PDF (1/2 Pages) LEM – Current Transducer LA 25-NP/SP7

Current Transducer LA 25-NP/SP7
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 = 2.5 A
Electrical data
I
Primary nominal r.m.s. current
PN
I_P
Primary current, measuring range
R
Measuring resistance
M
with ± 15 V
@ ± 2.5 A
max
@ ± 3.6 A _max
I_SN
Secondary nominal r.m.s. current
K _N Conversion ratio
V_C Supply voltage (± 5 %)
I_C
Current consumption
V_d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
V_b
R.m.s. rated voltage ¹⁾, safe separation
basic isolation
2.5
A
0 .. ± 3.6
A
R
M min
R
M max
100 320 Ω
100 190 Ω
25
mA
10 : 1000
± 15
V
10 + I_S
mA
2.5
kV
600
V
1700
V
Accuracy - Dynamic performance data
X
ε_L
Typical accuracy @ I_PN , T_A = 25°C
Linearity
± 0.5
%
< 0.2
%
Typ Max
I
Offset current ²⁾ @ I = 0, T = 25°C
O
P
A
± 0.05 ± 0.15 mA
I_OM Residual current ³⁾ @ I_P = 0, after an overload of 3 x I_PN ± 0.05 ± 0.15 mA
I
Thermal drift of I
OT
O
0°C .. + 25°C ± 0.06 ± 0.25 mA
+ 25°C .. + 70°C ± 0.10 ± 0.35 mA
t
Response time ⁴⁾ @ 90 % of I
r
P max
f
Frequency bandwidth (- 1 dB)
<1
µs
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 ⁵⁾
0 .. + 70
°C
- 25 .. + 85
°C
< 8.5
mΩ
110
Ω
5.5
µH
> 1500
MΩ
22
g
EN 50178
Notes : ¹⁾ Pollution class 2
2) _{Measurement carried out after 15 mn functionning}
3) _{The result of the coercive field of the magnetic circuit}
4) _{With a di/dt of 100 A/µs}
5) _{A list of corresponding tests is available}
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 = 2.5 A
•I_P = 0 .. ± 3.6 A
•K _N = 10 : 1000.
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.
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.
990125/2
LEM Components
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