AC/DC Current Transducer DHR-C420
The transducer for the electronic measurement of DC & distorted AC
waveform currents, with galvanic isolation between the primary circuit
(power) and the secondary circuit (measurement). True RMS 4-20 mA
current output.
I
PN
= 500 .. 1000 A
Electrical data
Primary Nominal
DC & AC Current
I
PN
(A.t.RMS)
500
2)
600
2)
1000
2)
R
L
V
C
I
C
I
SL
Î
P
Primary AC Current
Max. Peak Value
1)
I
P
(A)
1800
1800
1800
Output current
I
OUT
(mA DC)
4-20
4-20
4-20
Type
Features
DHR 500 C420
DHR 600 C420
DHR 1000 C420
< 300
+ 20 .. 50
30 mA +
I
OUT
< 25
30000
W
V DC
mA
A.t
● VFD and SCR waveforms current
measurement
● True RMS output
● 4-20 mA current output
● Panel mounting
● Eliminates insertion loss
● Isolated plastic case recognized
according to UL94-V0
Load resistance
Supply voltage
2)
Current consumption
Output current limitation
Overload capability (Ampere Turns)
Performance data
X
Advantages
<±1
% of
I
PN
< ± 1.0
% of
I
PN
4
mA+/-
I
OE
< ± 1.0
% of
I
PN
± 3.2
mA/K
± 6.4
mA/K
± 0.1
%/K
< 150
ms
DC 20..6000
Hz
● Large aperture for cable up to
Ø32mm
● High isolation between primary
and secondary circuits
● Easy installation
I
OUT
I
OE
TCI
OE
TCI
OUT
t
r
BW
e
L
Accuracy @
I
PN
,
T
A
= 25°C (excluding offset)
Linearity error (1% of
I
PN
.. ±
I
PN
)
Output current @
I
P
=0,
T
A
= 25°C
Electrical offset current @
T
A
= 25°C
Temperature coefficient of
I
OE
( 0..+60 °C)
(-40..+70 °C)
Temperature coefficient of
I
OUT
(% of reading)
Response time to 90 % of
I
PN
step
Frequency bandwidth (± 1 dB)
Applications
●
VFD Controlled Loads
VFD output indicates how the
motor and attached load are
operating.
●
SCR Controlled Loads
Acurate measurement of phase
angle fired or burst fired (time
proportioned) SCRs. Current
measurement gives faster
response than temperature
measurement.
●
Switching Power Supplies and
Electronic Ballasts
True RMS sensing is the most
accurate way to measure power
supply or ballast input power.
General data
T
A
T
S
m
IPxx
Surrounding operating temperature
Surrounding storage temperature
Mass
Protection degree
- 40 .. + 70
- 40 .. + 85
260
IP20
°C
°C
g
Notes :
1)
The Max. Peak AC Current is the highest peak level of the primary
signal that is taken into account for accurate True RMS calculation. Yet
the device is designed for maximum continuous True RMS value equal to
I
PN
, whereas the output is limited by the above specified output limitation.
2)
According to the UL 508 Standard for Safety for Industrial Control
Equipment the primary current must not exceed 475 A.t.RMS through the
transducer hole and the supply voltage must not exceed 42VDC..
Application domain
● Energy and Automation
Page 1/4
120426/00
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Current Transducer DHR-C420
Isolation characteristics
V
b
Rated isolation voltage rms
3)
300
V
according to the standard IEC 61010-1 and with the following conditions:
- Reinforced isolation
- Over voltage category CAT III
- Pollution degree PD2
- Heterogeneous field
Rms voltage for AC isolation test
4)
, 50 Hz, 1min
4.0
kV
Impulse withstand voltage
4)
, 1.2/50 uS
7.3
kV
Creepage distance
7.2
mm
Clearance distance
7.2
mm
Comparative tracking index (Group I)
> 600
V
d
V
w
dCp
dCl
CTI
Notes :
3)
Between primary conductor voltage and ground. The voltage category
could be improved according to the insulation characteristic given by
the cable manufacturer. The UL 508 Standard for Safety for Industrial
Control Equipment requires that only insulated conductors are used as
primary circuit with this transducer.
4)
Between primary (completely filling the aperture) and secondary.
Transfer characteristics
Output in mA
20
4
-Ipn
+Ipn
Page 2/4
120426/00
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Current Transducer DHR-C420
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 manufacturers’
operating instructions.
Caution! Risk of electrical shock
When operating the transducer, certain parts of the module may carry hazardous live voltage (e.g.
primary conductor, power supply).
The user shall ensure to take all measures necessary to protect against electrical shock.
The transducer is a built-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.
Page 3/4
120426/00
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Dimensions DHR-C420
(in mm. 1 mm = 0.0394 inch)
25
Dimensions DHR-C420
(in mm. 1 mm = 0.0394 inch)
60
25
70
60
70
32
4.
60
6.80
25
15
32
40
4.
60
6.80
8.30
8.30
22.28
40
6.80
10
90
22.28
6.80
25
15
4
2.50
10
20.34
15
90
33.80
2.50
4.60
15
33.80
8.30
4.60
7
8.30
6
78
6
78
Plug in
in connector:
Plug
connector:
FKC2.5/4-ST-5.08
FKC 2.5/4-ST-5.08-RF
(Phoenix Contact)
(Phoenix Contact)
DHR-C420
DHR
Connections
Connections
● Wires up to Ø 2 mm
Output Connector
1(Vcc) 2(Iout) 3(NC) 4(GND)
24 VDC Power
(+)
(-)
•
Wires up to
∅
2
connector provided (spring terminal blocks)
● Female
mm
•
Female
User-friendly spring-cage connection
blocks)
●
connector provided
(spring terminal
for no-tool direct
•
User-friendly spring-cage connection for no-tool
conductor connection
direct conductor connection
Mechanical characteristics
(-)
(+)
Load
(Controller, meter etc)
±1 mm
● Primary aperture
Ø 32.0 mm
•
General tolerance
±1 mm
● Panel mounting
4 holes Ø 4.6 mm
•
Primary aperture
between holes
32.0 mm
70.0 mm & 78 mm
∅
● Distance
•
Panel mounting
dimensions)
holes
∅
4.6 mm
4
(see above
•
Distance between holes
70 mm & 78 mm
For panel mounting, use M4 screws (not supplied) with
(see above drawings)
appropriate length to panel´s thickness, and tighten to
For panel mounting, replace M4 screws by new one (not supplied)
0.75Nm +/-20% torque.
with appropriate length to panel´s thickness.
● General tolerance
Mechanical characteristics
Remarks
90 °C.
● The
Remarks
temperature of the primary busbar can not exceed
OUT
Ip
Is
+24VDC
GND
•
The
● Dynamic performances
conductor can
with a primary
°C.
temperature of the primary
are the best
not exceed 90
•
Dynamic performances are
filling the
with a primary conductor
busbar completely
the best
primary aperture.
completely filling
standard model. For different versions
● This is a
the primary aperture.
•
This is
(supply voltages, different outputs, bidirectional
voltages,
a standard model. For different versions (supply
different outputs, bidirectional measurement,...), please
measurements...), please contact us.
Page 4/4
contact us.
Page 4/4
www.lem.com
120426/00
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
080725/16
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
25.60
www.lem.com
25.60
4
70
70
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