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 4-20mA
current output.
I
PN
= 100..1000 A
Features
Electrical data
Primary Nominal
DC & AC Current
I
PN
(A.t.RMS)
100
200
300
400
500
600
1000
Primary AC Current
Max. Peak Value
(
*
)
I
P
(A)
600
600
1000
1000
1800
1800
1800
Output current
I
OUT
(mADC)
4-20
4-20
4-20
4-20
4-20
4-20
4-20
DHR 100 C420
DHR 200 C420
DHR 300 C420
DHR 400 C420
DHR 500 C420
DHR 600 C420
DHR 1000 C420
Type
•
VFD and SCR waveforms current
measurement
•
True RMS output
•
4-20mA current output
•
Panel mounting
•
Eliminates insertion loss
•
Insulated plastic case recognized
according to UL94-V0
R
L
V
C
I
C
I
SL
Î
P
Load resistance
Supply voltage
Current consumption
Output current limitation
Overload capability (Ampere Turns)
< 300
Ω
+ 20 .. 50 V DC
30 mA +
I
OUT
< 25
mA
30000
A.t
Advantages
•
Large aperture for cable up to
Ø32mm
•
High isolation between primary and
secondary circuits
•
Easy installation
Performance data
ε
X
L
I
OE
TCI
OE
TCI
OUT
t
r
BW
Accuracy @
I
PN
,
T
A
= 25°C (excluding offset)
Linearity error (1% of
I
PN
.. ±
I
PN
)
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 (±1dB)
< ± 1 % of
I
PN
< ± 1.0 % of
I
PN
4
mA
± 3.2
µA/K
± 6.4
µA/K
± 0.1
%/K
< 150
ms
DC 20..6000Hz
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)
General data
T
A
T
S
m
IPxx
Ambient operating temperature
Ambient storage temperature
Mass
Protection degree
- 40 .. + 70
- 40 .. + 85
260
IP20
°C
°C
g
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.
Note :
* 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.
( )
Application domain
•
Energy and Automation
Page 1/3
061128/14
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
300
V
with IEC 61010-1 acc. to the 61326 standards and following conditions :
- Reinforced isolation
- Over voltage category CAT III
- Pollution degree PD2
- Heterogeneous field
Rms voltage for AC isolation test
1)
, 50 Hz, 1min
4.6
kV
Creepage distance
8.89
mm
Clearance distance
8.89
mm
Comparative tracking index (Group I)
> 600
V
d
dCp
dCl
CTI
Note :
1)
Between primary (completely filling the aperture) and secondary.
Output polarity with DC input
Output in mA
20
4
-Ipn
+Ipn
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the
manufacturer’s operating instructions.
Installation and maintenance should be done with main power supply
disconnected.
The operator must have an accreditation to install this material.
Caution! Risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (e.g. primary conductor, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
The user must take care of all protection guarantee against electrical shock.
This transducer is a built-in device, whose conducting parts must be inaccessible
after installation. A protective housing or additional shield could be used.
Page 2/3
061128/14
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
70
60
32
4.
60
2 2.2 8
25
15
8.30
6.8 0
90
2 .50
10
40
6 .80
4
15
33 .80
70
4 .60
7
8.30
6
78
Connections
•
Wires up to 2 mm
∅
DHR-C420
•
Female connector provided
(screw terminals)
Mechanical characteristics
•
General tolerance
•
Primary aperture
•
Panel mounting
•
Distance between holes
±1 mm
∅
32.0 mm
4 holes
∅
4.6 mm
70 mm & 78 mm
DHR
(see above drawings)
For panel mounting, replace M4 screws by new one (not supplied)
Output Connector
1(Vcc) 2(Iout) 3(NC) 4(GND)
24 VDC Power
(+)
(-)
with appropriate length to panel´s thickness.
Remarks
•
V
OUT
is positive when I
P
flows in the direction of the arrow.
•
The return busbar and primary conductor elbow must be located
at least at 2.5 x window length more far away from the transducer
case.
•
The temperature of the primary busbar can not exceed 90 °C.
•
Dynamic performances are the best with a primary busbar
completely filling the primary aperture.
•
This is a standard model. For different versions (supply voltages,
different outputs, bidirectional measurements...), please
contact us.
+24VDC
OUT
Is
(-)
(+)
Load
(Controller, meter etc)
Ip
GND
25.60
Page 3/3
061128/14
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
京公网安备 11010802033920号
EEWORLD
