DATASHEET
LEM
LA125-P
OTHER SYMBOLS:
RGB ELEKTRONIKA AGACIAK CIACIEK
SPÓŁKA JAWNA
Jana Dlugosza 2-6 Street
51-162 Wrocław
Poland
www.rgbelektronika.pl
biuro@rgbelektronika.pl
+48 71 325 15 05
www.rgbautomatyka.pl
www.rgbautomatyka.pl
www.rgbelektronika.pl
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Current Transducer LA 125-P
IPN
=
125 A
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).
16030
Electrical data
IPN
IPM
RM
Primary nominal current rms
Primary current, measuring range
Measuring resistance @
with ± 12 V
with ± 15 V
ISN
KN
VC
IC
125
0 .. ± 200
TA = 70°C
TA = 85°C
RM mini RM maxi RM mini RM maxi
@ ± 125 A maxi
@ ± 200 A maxi
@ ± 125 A maxi
@ ± 200 A maxi
5
5
25
25
Secondary nominal current rms
Conversion ratio
Supply voltage (± 5 %)
Current consumption
52
20
74
34
14
14
40
40 1)
50
18
72
40 1)
A
A
ε
Accuracy @ IPN , TA = 25°C
Ω
Ω
Ω
Ω
125
mA
1 : 1000
± 12 .. 15
V
16 (@ ± 15 V) + IS mA
@ ± 15 V (± 5 %)
@ ± 12 .. 15 V (± 5 %)
Linearity error
L
± 0.60
± 0.80
< 0.15
Typ
IO
IOM
IOT
tra
tr
di/dt
BW
%
%
%
Maxi
± 0.40
Offset current @ IP = 0, TA = 25°C
Magnetic offset current 2) @ IP = 0 and specified R M,
after an overload of 3 x IPN
Temperature variation of IO
0°C .. + 70°C
- 40°C .. + 85°C
± 0.50
± 0.15 ± 0.50
± 0.30 ± 0.95
Reaction time @ 10 % of IPN
Response time 3) 4) to 90 % of IPN step
di/dt accurately followed 4)
Frequency bandwidth 4) (- 1 dB)
< 500
<1
> 200
DC .. 100
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
m
Mass
Standards
2)
3)
4)
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
mA
mA
mA
ns
µs
A/µs
kHz
• 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)
TA
TS
RS
1)
• Printed circuit board mounting
• Isolated plastic case recognized
mA
General data
Notes:
• Closed loop (compensated) current
transducer using the Hall effect
Accuracy - Dynamic performance data
X
Features
TA = 70°C
TA = 85°C
- 40 .. + 85
°C
- 40 .. + 90
°C
32
Ω
33.5
Ω
40
g
EN 50178: 1997
• Power supplies for welding
applications.
Application Domain
• Industrial.
Measuring range limited to ± 180 A maxi
The result of the coercive field of the magnetic circuit.
With a di/dt of 100 A/µs
The primary conductor is best filling the through-hole and/or the return
of the primary conductor is above the top of the transducer.
page 1/3
070806/12
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Current Transducer LA 125-P
Isolation characteristics
Vd
Vw
Rms voltage for AC isolation test, 50/60 Hz, 1 min
Impulse withstand voltage 1.2/50 µs
3
7
kV
kV
dCp
dCl
CTI
Creepage distance
Clearance distance
Comparative Tracking Index (Group IIIa)
Mini
6.7
6.7
175
mm
mm
Application examples
According to EN 50178 and IEC 61010-1 standards and following conditions:
• Over voltage category OV 3
• Pollution degree PD2
• Non-uniform field
EN 50178
IEC 61010-1
Rated isolation voltage
Nominal voltage
Single isolation
600 V
600 V
Reinforced isolation
300 V
300 V
dCp, dCI, V W
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the manufacturer's
operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-in device, whose conducting parts must be inaccessible
after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
page 2/3
070806/12
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Dimensions LA 125-P
(in mm. 1 mm = 0.0394 inch)
Bottom view
Left view
Connection
Front view
Mechanical characteristics
Remarks
• General tolerance
± 0.2 mm
• Primary through-hole
17 x 11 mm
• Fastening & connection of secondary 4 pins 0.63 x 0.56 mm
• IS is positive when IP flows in the direction of the arrow.
• Temperature of the primary conductor should not exceed
Recommended PCB hole
• Supplementary fastening
Recommended PCB hole
Recommended screws
Recommended fastening torque
0.9 mm
2 holes ∅ 1.75 mm
2.4 mm
PT K A 22 x 6
0.5 Nm or .37 Lb. - Ft.
90°C.
• Dynamic performances (di/dt and response time) are best
with a primary bar in low position in the through-hole.
• In order to achieve the best magnetic coupling, the primary
windings have to be wound over the top edge of the device.
• This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
page 3/3
070806/12
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com