LA55-TP datasheet(1/2 Pages) LEM

Teilenummer	LA55-TP

Bauteilbeschribung	Current Transducer LA 55-TP

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Current Transducer LA 55-TP

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

0 .. ± 70

A

R

M

Measuring resistance @

T

A = 70°C

T

A = 85°C

R

M min RM max

R

M min RM max

with ± 12 V

@ ± 50 A

max

10

100

60

95

Ω

@ ± 70 A

max

10

50

60 1) 60 1)

Ω

with ± 15 V

@ ± 50 A

max

50

160

135 155

Ω

@ ± 70 A

max

50

90

135 2)135 2)

Ω

I

SN

Secondary nominal r.m.s. current

50

mA

K

N

Conversion ratio

1 : 1000

V

C

Supply voltage (± 5 %)

± 12 .. 15

V

I

C

Current consumption

10 (@ ± 15 V) + I

S mA

V

d

R.m.s. voltage for AC isolation test, 50 Hz, 1 mn

2

kV

V

b

R.m.s. rated voltage

60

V

Accuracy - Dynamic performance data

X

Accuracy @ I

PN , TA = 25°C

@ ± 15 V (± 5 %)

± 0.65

%

@ ± 12 .. 15 V (± 5 %)

± 0.90

%

ε

L

Linearity

< 0.15

%

Typ

Max

I

O

Offset current @ I

P = 0, TA = 25°C

± 0.2

mA

I

OM

Residual current 3) @ I

P = 0, after an overload of 3 x IPN

± 0.3

mA

I

OT

Thermal drift of I

O

0°C .. + 70°C

± 0.1

± 0.5

mA

- 25°C .. + 85°C

± 0.1

± 0.6

mA

t

ra

Reaction time @ 10 % of I

P max

< 500

n s

t

r

Response time 4) @ 90 % of I

P max

< 1

µs

di/dt

di/dt accurately followed

> 200

A/µs

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 = 70°C

80

Ω

T

A = 85°C

85

Ω

m

Mass

24

g

Standards 5)

EN 50178

Notes : 1) Measuring range limited to ± 60 A

max

2) Measuring range limited to ± 55 A

max

3) Result of the coercive field of the magnetic circuit

4) With a di/dt of 100 A/µs

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

980706/4

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