Current Transducer LA 55-P/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
IPN Primary nominal r.m.s. current 50 A
IPPrimary current, measuring range 0 .. ± 100 A
R M Measuring resistance @ TA = 70°C TA = 85°C
RM min RM max RM min RM max
with ± 12 V @ ± 50 A max 0215 0210 Ω
@ ± 100 A max 035 030 Ω
with ± 15 V @ ± 50 A max 0335 30 330 Ω
@ ± 100 A max 095 30 90 Ω
ISN Secondary nominal r.m.s. current 25 mA
K N Conversion ratio 1 : 2000
VCSupply voltage (± 5 %) ± 12 .. 15 V
ICCurrent consumption 10 (@ ± 15 V) + ISmA
VdR.m.s. voltage for AC isolation test, 50 Hz, 1 mn 2.5 kV
Accuracy - Dynamic performance data
XAccuracy @ IPN , TA = 25°C @ ± 15 V (± 5 %) ± 0.65 %
@ ± 12 .. 15 V (± 5 %) ± 0.90 %
εLLinearity < 0.15 %
Typ Max
IOOffset current @ IP = 0, TA = 25°C ± 0.10 mA
IOM Residual current 1) @ IP = 0, after an overload of 3 x IPN ± 0.15 mA
IOT Thermal drift of IO0°C .. + 70°C ± 0.05 ± 0.25 mA
- 25°C .. + 85°C ± 0.05 ± 0.30 mA
tra Reaction time @ 10 % of IP max < 500 ns
trResponse time 2) @ 90 % of IP max < 1 µs
di/dt di/dt accurately followed > 200 A/µs
fFrequency bandwidth (- 1 dB) DC .. 200 kHz
General data
TAAmbient operating temperature - 25 .. + 85 °C
TSAmbient storage temperature - 40 .. + 90 °C
R S Secondary coil resistance @ TA = 70°C 145 Ω
TA = 85°C 150 Ω
mMass 18 g
Standards 3) EN 50178
Notes : 1) Result of the coercive field of the magnetic circuit
2) With a di/dt of 100 A/µs
3) 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.
Special features
• IP=0 .. ± 100 A
• K N =1 : 2000.
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.
IPN =50 A
981130/9
LEM Components www.lem.com
Secondary terminals
Terminal +:supply voltage +12 .. 15 V
Terminal -:supply voltage -12 .. 15 V
Terminal M:measure
Connection
Remarks
• IS is positive when IP flows in the direction of the arrow.
• Temperature of the primary conductor should not exceed
90°C.
• Dynamic performances (di/dt and response time) are best
with a single bar completely filling the primary hole.
• In order to achieve the best magnetic coupling, the primary
windings have to be wound over the top edge of the device.
Mechanical characteristics
• General tolerance ± 0.2 mm
• Primary through-hole 12.7 x 7 mm
• Fastening & connection of secondary 3 pins
0.63 x 0.56 mm
Recommended PCB hole 0.9 mm
Bottom view
Front view
Left view
Dimensions LA 55-P/SP1 (in mm. 1 mm = 0.0394 inch)
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Standard 00 Year Week
or N° SP..
swiss
made
