Current Transducer LF 505-S
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
500
A
I
P
Primary current, measuring range
0 .. 800
A
R
M
Measuring resistance
R
M min
R
M max
with 15 V
@ 500 A
max
0
60
@ 800 A
max
0
11
with 18 V
@ 500 A
max
0
92
@ 800 A
max
0
30
with 24 V
@ 500 A
max
5
149
@ 800 A
max
5
65
I
SN
Secondary nominal r.m.s. current
100
mA
K
N
Conversion ratio
1 : 5000
V
C
Supply voltage ( 5 %)
15 .. 24
V
I
C
Current consumption
24
(@ 18 V) +
I
S
mA
V
d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
3
kV
Accuracy - Dynamic performance data
X
G
Overall accuracy @
I
PN
,
T
A
= 25C
0.6
%
L
Linearity
< 0.1
%
Typ
Max
I
O
Offset current @
I
P
= 0,
T
A
= 25C
0.4
mA
I
OT
Thermal drift of
I
O
- 10C .. + 70C
0.3 0.5
mA
t
r
Response time
1)
@ 90 % of
I
PN
< 1
s
di/dt
di/dt
accurately followed
> 100
A/ s
f
Frequency bandwidth (-
1
dB)
DC .. 100
kHz
General data
T
A
Ambient operating temperature
- 10 .. + 70
C
T
S
Ambient storage temperature
- 25 .. + 85
C
R
S
Secondary coil resistance @
T
A
= 70C
70
m
Mass
230
g
Standards
2)
EN 50155
EN 50178
Notes :
1)
With a di/dt of
100
A/s
2)
A list of corresponding tests is available
Features
Closed loop (compensated) 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.
I
PN
= 500
A
010327/4
LEM Components
w w w .lem.com
Preliminary
Secondary terminals
Pin +
: supply voltage + 15 .. 24 V
Pin M
: measure
Pin -
: supply voltage - 15 .. 24 V
Mechanical characteristics
General tolerance
0.5 mm
Fastening
see drawing
Primary through-hole
30.2 x 30.2 mm
Connection of secondary
MOLEX 5045-03/AG
Dimensions LF 505-S
(in mm. 1 mm = 0.0394 inch)
Top view
Right view
Remarks
I
S
is positive when
I
P
flows in the direction of the arrow.
Temperature of the primary conductor should not exceed
100C.
Dynamic performances (di/dt and response time) are best
with a single bar completely filling the primary hole.
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Bottom view
Back view
Connection
MOLEX 5045-03/AG
PDF 
ZIP