Current Transducer LB 500-S/SP1
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 .. 750
A
R
M
Measuring resistance
R
M min
R
M max
with 15 V
@ 500 A
max
5
33
@ 750 A
max
5
15
I
SN
Secondary nominal r.m.s. current
200
mA
K
N
Conversion ratio
1 : 2500
V
C
Supply voltage ( 5 %)
15
V
I
C
Current consumption
20
+
I
S
mA
V
d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
6
1)
kV
Accuracy - Dynamic performance data
X
Accuracy @ I
PN,
T
A
= 25C
0.5
%
L
Linearity
< 0.1
%
Typ
Max
I
O
Offset current @ I
P
= 0, T
A
= 25C
0.500 mA
I
OT
Thermal drift of I
O
+ 10C .. + 50C
0.064 mA
t
r
Response time
2)
@ 90 % of I
PN
< 1
s
di/dt
di/dt accurately followed
> 50
A/s
f
Frequency bandwidth (- 1 dB)
DC .. 150
kHz
Zero crossing distortion
negligeable
General data
T
A
Ambient operating temperature
+ 10 .. + 50
C
T
S
Ambient storage temperature
- 25 .. + 85
C
R
S
Secondary coil resistance @ T
A
= 50C
30
m
Mass
670
g
Standards
EN 50178
Notes :
1)
Between primary and secondary.
2)
With a di/dt of 100 A/s
Features
Closed loop (compensated) current
transducer using the Hall effect
Insulated plastic case recognized
according to UL 94-V0.
Special features
V
C
= 15 ( 5 %)
V
K
N
= 1 : 2500
Low thermal offset drift with
temperature
Better zero crossing performance
T
A
= + 10C .. + 50C
Shield between primary and
secondary connected to V
C
"
-
"
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
HVDC transmisions.
I
PN
= 500
A
990803/2
LEM Components
www.lem.com
Preliminary
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal M : measure
Terminal - : supply voltage - 15 V
Connection
Remarks
I
S
is positive when I
P
flows in the direction of the arrow.
Temperature of the primary conductor should not exceed
70C.
Dynamic performances (di/dt and response time) are best
with a single bar completely filling the primary hole.
Mechanical characteristics
General tolerance
0.5 mm
Fastening
4 slots
6.5 mm
Primary through-hole
25 mm
Connection of secondary
M5 threaded studs
Fastening torque
2.2 Nm or 1.62 Lb. - Ft.
Dimensions LB 500-S/SP1
(in mm. 1 mm = 0.0394 inch)
Right view
Front view
Top view
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
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