LA25-SP7 Datasheet, PDF (1/3 Pages) LEM – Current Transducer

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
16160
I
Primary nominal current rms
PN
I_PM
Primary current, measuring range
R
Measuring resistance
M
with ± 15 V
@ ± 2.5 A
maxi
@ ± 3.6 A _maxi
I
Secondary nominal current rms
SN
K _N Conversion ratio
V_C
Supply voltage (± 5 %)
I_C
Current consumption
Accuracy - Dynamic performance data
X
ε
Typical accuracy @ I_PN , T_A = 25°C
Linearity error
L
I_O
Offset current ²⁾ @ I_P = 0, T_A = 25°C
I_OM
Magnetic offset current ³⁾ @ I_P =
0, after an overload of 3 x I_PN
I_OT
Temperature variation of I_O
0°C .. + 25°C
+ 25°C .. + 70°C
t
Response time ⁴⁾ to 90 % of I step
r
PN
BW Frequency bandwidth (- 1 dB)
General data
T
Ambient operating temperature
A
T_S
Ambient storage temperature
R _P Primary coil resistance @ T_A = 25°C
R _S Secondary coil resistance @ T_A = 70°C
L _P Insertion inductance
R
Isolation resistance @ 500 V, T = 25°C
IS
A
m
Mass
Standards
2.5
A
0 .. ± 3.6
A
R
M mini
R
M maxi
100 320 Ω
100 190 Ω
25
mA
10 : 1000
± 15
V
10 + I_S
mA
± 0.5
%
< 0.2
%
Typ Maxi
± 0.05 ± 0.15 mA
± 0.05 ± 0.15 mA
± 0.06 ± 0.25 mA
± 0.10 ± 0.35 mA
<1
µs
DC .. 150
kHz
0 .. + 70
°C
- 25 .. + 85
°C
< 8.5
mΩ
110
Ω
5.5
µH
> 1500
MΩ
22
g
EN 50178: 1997
Features
• Closed loop (compensated) multi-
turns current transducer using the
Hall effect
• Isolated plastic case recognized
according to UL 94-V0.
Special features
• I_PN = 2.5 A
•
I
PM
=
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.
Application Domain
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.}
• Industrial.
070305/4
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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