AC Current Transducer AKR-C420L
Transducer for the electronic measurement AC waweforms current,
with galvanic separation between the primary circuit and the
secondary circuit. Jumper selectable ranges and True RMS 4-20 mA
current output.
I
PN
= 2 … 200 A
Electrical data
Primary nominal current
I
PN
(At rms)
2, 5
10, 20, 50
100, 150, 200
U
C
R
L
Analogue output voltage
1)
I
out
(mA)
4-20
4-20
4-20
Types
Features
● VFD and SCR waveforms current
measurement
● True RMS responding
● 4-20 mA current output
● Loop powered transducers
● Panel mounting
● Accurate
● Jumper selectable ranges.
AKR 5 C420L
AKR 50 C420L
AKR 200 C420L
24
V DC
see power supply diagram
Supply voltage (Loop powered)
Load resistance
Advantages
● Large aperture
● High insulation between primary
and secondary circuits
● Easy to mount.
Accuracy - Dynamic performance data
X
t
r
BW
Accuracy @
I
PN
,
T
A
= 25 °C
Step response time to 90 % of
I
PN
Frequency bandwidth
±1
< 600
10-400
%
ms
Hz
General data
T
A
T
S
m
Ambient operating temperature (0-95 %
RH)
Ambient storage temperature
Mass
Sandards
−20 … +50
°C
−20 … +85
°C
90
g
Safety IEC 61010-1: 2001
EMC EN 61326-1: 2005
Applications
●
VFD Controlled Loads
VFD output indicates how the
motor and attached load are
operating.
●
SCR Controlled Loads
Accurate measurement of phase
angle fired or burst fired (time
proportioned) SCRs.
●
Switching Power Supplies and
Electronic Ballasts
True RMS sensing is the most
accurate way to measure power
supply or ballast input power.
Note:
1)
For 4-20 mA output model, no saturation output up to 23 mA.
Selecting the transducer
VFD (Variable Frequency Drive) and SCR (Semi Conductor Rectifier) output
waveforms are rough approximations of a sine wave. There are numerous spikes
and dips in each cycle. AKR transducers use a mathematical algorithm called “True
RMS”, which integrates the actual waveform over time. True RMS is the only way to
accurately measure distorted AC waveforms.
Select AKR transducers for nonlinear
loads or in “noisy” power environments.
Options on request
● DIN mounting.
Application domain
● Renewable Energies and
Power Supplies.
F2.11.08.000.0; F2.11.25.000.0; F2.11.44.000.0
14March2016/version 8
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
Page 1/3
www.lem.com
AC current Transducer AKR-C420L
Insulation coordination
U
d
U
B
Rms voltage for AC insulation test
1)
, 50 Hz, 1 min 3
Rated insulation rms voltage
2)
,
reinforced or basic insulation, CAT III, PD2
150
1)
2)
kV AC
V AC
Notes:
Between primary (completely filling the primary aperture) and secondary
If insulated cable is used for the primary circuit, the voltage category
could be improved according to the insulation coordination given by the
cable manufacturer. For example:
Cable insulation (primary):
Category:
HAR 05
600 V CAT III
HAR 07
1000 V CAT III
Safety and warning notes
In order to guarantee safe operation of the transducer and to be able to make proper
use of all features and functions, please read these instructions thoroughly! Safe
operation can only be guaranteed if the transducer is used for the purpose it has
been designed for and within the limits of the technical specifications. Ensure you get
up-to-date technical information that can be found in the latest associated datasheet
under www.lem.com.
Caution! Risk of danger
Ignoring the warnings can lead to serious injury and/or cause damage!
The electric measuring transducer may only be installed and put into
operation by qualified personnel that have received an appropriate
training.The corresponding national regulations shall be observed during
installation and operation of the transducer and any electrical conductor.
The transducer shall be used in electric/electronic equipment with respect
to applicable standards and safety requirements and in accordance
with all the related systems and components manufacturer’s operating
instructions.
Caution, Risk of electrical shock
When operating the transducer, certain parts of the module may carry
hazardous live voltage (eg. primary conductor, power supply). The user
shall ensure to take all measures necessary to protect against electical
shock.The transducer is a build-in device containing conducting parts
that shall not be accessible after installation. A protective enclosure or
additional insulation barrier may be necessary. The transducer shall not
be put into operation if the jaw opening is open (split core version) or the
installation is not completed.Installation and maintenance shall be done
with the main power supply disconnected except if there are no hazardous
live parts in or in close proximity to the system and if the applicable national
regulations are fully observed.
Safe and trouble-free operation of this transducer can only be guaranteed if transport,
storage and installation are carried out correctly and operation and maintenance are
carried out with care.
14March2016/version 8
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
Page 2/3
www.lem.com
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