Voltage Transducer LV 20-P
For the electronic measurement of voltages : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high voltage)
and the secondary circuit (electronic circuit).
I
PN
= 10 mA
V
PN
= 10 .. 500 V
Electrical data
I
PN
I
P
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance
with ± 12 V
with ± 15 V
I
SN
K
N
V
C
I
C
V
d
@ ± 10 mA
max
@ ± 14 mA
max
@ ± 10 mA
max
@ ± 14 mA
max
10
mA
0 .. ± 14
mA
R
M min
R
M max
30
30
100
100
190
100
350
190
Ω
Ω
Ω
Ω
Features
•
Closed loop (compensated) voltage
transducer using the Hall effect
•
Insulated plastic case recognized
according to UL 94-V0
•
Optimized.
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
R.m.s. voltage for AC isolation test
1)
, 50 Hz, 1 mn
25
mA
2500 : 1000
± 12 .. 15
V
10
(@ ±15 V ) +
I
S
m A
2.5
kV
Principle of use
•
For voltage measurements, a current
proportional to the measured voltage
must be passed through an external
resistor
R
1
which is selected by the
user and installed in series with the
primary circuit of the transducer.
Accuracy - Dynamic performance data
X
G
Overall Accuracy @
I
PN
,
T
A
= 25°C
Linearity
Offset current @
I
P
= 0,
T
A
= 25°C
Thermal drift of
I
O
Response time
2)
@ 90 % of
V
P max
@ ± 12 .. 15 V
@ ± 15 V (± 5 %)
± 1.1
± 1.0
< 0.2
Max
± 0.20
± 0.10 ± 0.30
± 0.14 ± 0.40
40
Typ
%
%
%
mA
mA
mA
µs
ε
Advantages
•
•
•
•
•
•
Excellent accuracy
Very good linearity
Low thermal drift
Low response time
High bandwidth
High immunity to external
interference
•
Low disturbance in common mode.
L
I
O
I
OT
t
r
0°C .. + 25°C
+ 25°C .. + 70°C
General data
T
A
T
S
R
P
R
S
m
Ambient operating temperature
Ambient storage temperature
Primary coil resistance @
T
A
= 70°C
Secondary coil resistance @
T
A
= 70°C
Mass
Standards
3)
0 .. + 70
- 25 .. + 85
250
110
22
EN 50178
°C
°C
Ω
Ω
g
Applications
•
AC variable speed drives and servo
•
•
•
•
motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies
(UPS)
Power supplies for welding
applications .
Notes :
1)
2)
3)
Between primary and secondary
R
1
= 25 kΩ (L/R constant, produced by the resistance and inductance
of the primary circuit)
A list of corresponding tests is available
010802/0
LEM Components
w w w.lem.com
Dimensions LV 20-P
(in mm. 1 mm = 0.0394 inch)
Bottom view
Right view
Top view
Standard 00
or N
o
SP..
Year Week
Secondary terminals
Terminal + : supply voltage + 12 .. 15 V
Terminal M : measure
Terminal - : supply voltage - 12 .. 15 V
Connection
Back view
Mechanical characteristics
•
General tolerance
•
Fastening & connection of primary
± 0.2 mm
2 pins
0.635 x 0.635 mm
•
Fastening & connection of secondary 3 pins
∅
1 mm
•
Recommended PCB hole
1.2 mm
Remarks
•
I
S
is positive when
V
P
is applied on terminal +HT.
•
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Instructions for use of the voltage transducer model LV 20-P
Primary resistor
R
1
: the transducer’s optimum accuracy is obtained at the nominal primary current. As much as possible,
R
1
should be
calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA .
Example: Voltage to be measured
V
PN
= 250 V
a)
R
1
= 25 kΩ / 2.5 W,
I
P
= 10 mA
b)
R
1
= 50 kΩ / 1.25 W,
I
P
= 5 mA
Accuracy = ± 1 % of
V
PN
(@
T
A
= + 25°C)
Accuracy = ± 2 % of
V
PN
(@
T
A
= + 25°C)
Operating range (recommended) : taking into account the resistance of the primary windings (which must remain low compared to
R
1,
in order
to keep thermal deviation as low as possible) and the isolation, this transducer is suitable for measuring nominal voltages from 10 to 500 V.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
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