Current Transducer LAH 50-P
For the electronic measurement of currents : DC, AC, pulsed ...,
with a galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
Electrical data
I
PN
Primary nominal r.m.s. current
50
A
I
P
Primary current, measuring range
1)
0 .. 110
A
R
M
Measuring resistance @
T
A
= 70C
T
A
= 85C
R
M min
R
M max
R
M min
R
M max
with 12 V
@ I
PN
[ A
DC
]
0
221
0
214
@ I
PN
[A
RMS
]
2)
0
115
0
108
with 15 V
@ I
PN
[ A
DC
]
0
335
0
327
@ I
PN
[A
RMS
]
2)
0
195
0
188
I
SN
Secondary nominal r.m.s. current
25
mA
K
N
Conversion ratio
1 : 2000
V
C
Supply voltage ( 5 %)
12 .. 15
V
I
C
Current consumption
10
(@ 15V) + I
S
mA
V
d
R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn
5
kV
V
e
R.m.s. voltage for partial discharge extinction @ 10 pC > 2
kV
V
w
Impulse withstand voltage 1.2/50 s
> 12
kV
Accuracy - Dynamic performance data
X
Accuracy
3)
@ I
PN,
T
A
= 25C
0.25
%
L
Linearity
< 0.15
%
Typ
Max
I
O
Offset current @ T
A
= 25C
0.15 mA
I
OM
Residual current
@ I
P
= 0, after an overload of 5 x I
PN
0.10 0.15 mA
I
OT
Thermal drift of I
O
0C .. + 70C
0.10 0.30 mA
- 25C .. + 85C
0.10 0.40 mA
t
r a
Reaction time @ 10 % of I
PN
< 200
n s
t
r
Response time
4)
@ 90 % of I
PN
< 500
n s
di/dt
di/dt accurately followed
> 200
A/s
f
Frequency bandwidth (- 1 dB)
DC .. 200
kHz
General data
T
A
Ambient operating temperature
- 25 .. + 85
C
T
S
Ambient storage temperature
- 40 .. + 90
C
R
S
Secondary coil resistance
@ T
A
= 70C
135
@ T
A
= 85C
142
Insulating material group
I
m
Mass
22
g
Standards
5)
EN 50178
Notes :
1)
For 10 s, with
R
M
71
(V
C
= 15 V)
2)
50 Hz Sinusoidal
3)
Without I
O
& I
OM
4)
With a di/dt of 100 A/s
5)
A list of corresponding tests is available.
Features
Closed loop (compensated) current
transducer using the Hall effect
Printed circuit board mounting
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.
I
PN
=
50
A
010822/5
LEM Components
www.lem.com
Dimensions LAH 50-P
(in mm. 1 mm = 0.0394 inch)
Connection
Remarks
I
S
is positive when I
P
flows from terminals "IN" to terminals
"OUT".
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Mechanical characteristics
General tolerance
0.2 mm
Fastening & connection of primary
6 pins 1.4 x 1 mm
Recommended PCB hole
2 mm
Fastening & connection of secondary
3 pins 0.7 x 0.6 mm
Recommended PCB hole
1.2 mm
Front view
Bottom view
Left view
1
50
110
25
1 : 2000
0.12
0.008
N u m b e r
of primary
t u r n s
P r i m a r y c u r r e n t
n o m i n a l maximum
I
PN
[ A ] I
P
[ A ]
N o m i n a l
output current
I
SN
[ mA ]
T u r n s
r a t i o
K
N
P r i m a r y
r e s i s t a n c e
R
P
[ m
]
Primary insertion
i n d u c t a n c e
L
P
[ H ]
Secondary terminals
Terminal M : measure
Terminal + : supply voltage + 15 V
Terminal - : supply voltage - 15 V
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
IN
OUT
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