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).
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
Frequency bandwidth (- 1 dB)
General data
<1 > 50 DC .. 150
µs A/µs kHz
TA
Ambient operating temperature
T
Ambient storage temperature
S
R P Primary resistance per turn @ TA = 25°C
R
Secondary coil resistance
S
@ T = 70°C A
@ TA = 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
OUT 6 7 8 9 10 5 4 3 2 1 IN
OUT 6 7 8 9 10
Mechanical characteristics
Remarks
• General tolerance • Fastening & connection of primary • Fastening & connection of secondary • Recommended PCB hole
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inductance
LP
[ µH ]
0.3
0.023
1.1
0.09
2.5
0.21
4.4
0.37
6.3
0.58
Recommended connections
5 4 3 2 1 IN
OUT 6 7 8 9 10 5 4 3 2 1 IN
OUT 6 7 8 9 10 5 4 3 2 1 IN
OUT 6 7 8 9 10 5 4 3 2 1 IN
(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.
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
ISN
Secondary nominal r.m.s. current
K N Conversion ratio
± 0.2 mm 10 pins 0.7 x 0.6 mm 3 pins ∅ 1 mm 1.2 mm
• IS is positive when IP flows from terminals 1, 2, 3, 4, 5 to terminals 10, 9, 8, 7, 6
• This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...),
I
Offset current 2) @ I = 0, T = 25°C
O
P
A
± 0.05 ± 0.15 mA
IOM Residual current 3) @ IP = 0, after an overload of 3 x IPN ± 0.05 ± 0.15 mA
I
Thermal drift of I
Advantages
• Excellent accuracy • Very good linearity • Low temperature drift • Optimized response time • Wide frequency bandwidth • No insertion losses • High immunity to external
> 1500
MΩ
22
g
EN 50178 : 1997
Features
• Closed loop (compensated) multirange current transducer using the Hall effect
• Insulated plastic case recognized according to UL 94-V0.
IPN = 5-6-8-12-25 A
16080
Electrical data
I
Primary nominal r.m.s. current
PN
IP
Primary current, measuring range
R
Measuring resistance @
M
25
At
0 .. ± 36
At
T = 70°C T = 85°C
Dimensions LA 25-NP (in mm. 1 mm = 0.0394 inch)
Model + SP N° Date code
Bottom view
Right view
Top view
Back view
Connection
IN OUT
Number of primary turns
Primary current n o m i n a l maximum IPN [ A ] IP [ A ]
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
tr dห้องสมุดไป่ตู้/dt
f
Response time 4) @ 90 % of IPN di/dt accurately followed
25
mA
1-2-3-4-5 : 1000
± 15
V
10 + IS
mA
2.5
kV
600
V
1700
V
Accuracy - Dynamic performance data
X
εL
Typical accuracy @ IPN , TA = 25°C Linearity error
± 0.5
%
< 0.2
%
Typ Max
please contact us.
LEM
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
060327/13
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

VC Supply voltage (± 5 %)
IC
Current consumption
Vd
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
Vb
R.m.s. rated voltage 1), safe separation
basic isolation
Nominal output current ISN [ mA ]
1
25
36
25
2
12
18
24
3
8
12
24
4
6
9
24
5
5
7
25
Turns ratio KN 1/1000
2/1000
3/1000