LA25-NP_06 Datasheet, PDF (1/2 Pages) LEM – Current Transducer

Current Transducer LA 25-NP
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 = 5-6-8-12-25 A
16080
Electrical data
I
Primary nominal r.m.s. current
PN
I_P
Primary current, measuring range
R
Measuring resistance @
M
25
At
0 .. ± 36
At
T = 70°C T = 85°C
A
A
R R R R _{M min Mmax M min Mmax}
with ± 15 V
@ ± 25 At _max
@ ± 36 At _max
100 320 100 315 Ω
100 190 100 185 Ω
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
25
mA
1-2-3-4-5 : 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 error
± 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
- 25°C .. + 85°C
± 0.5 mA
- 40°C .. + 85°C
± 1.2 mA
t_r
di/dt
f
Response time ⁴⁾ @ 90 % of I_PN
di/dt accurately followed
Frequency bandwidth (- 1 dB)
General data
<1
> 50
DC .. 150
µs
A/µs
kHz
T_A
Ambient operating temperature
T
Ambient storage temperature
S
R _P Primary resistance per turn @ T_A = 25°C
R
Secondary coil resistance
S
@ T = 70°C
A
@ T_A = 85°C
R
Isolation resistance @ 500 V, T = 25°C
IS
A
m
Mass
Standards
- 40 .. + 85
°C
- 45 .. + 90
°C
< 1.25
mΩ
110
Ω
115
Ω
> 1500
MΩ
22
g
EN 50178 : 1997
Features
• Closed loop (compensated) multi-
range current transducer using the
Hall effect
• Insulated plastic case recognized
according to UL 94-V0.
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.
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.}
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
060327/13
Page 1/2
LEM
www.lem.com