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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.
IPN = 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
RL VC IC ISL IP
Load resistance Supply voltage Current consumption Output current limitation Overload capability (Ampere Turns)
< 300 + 20 .. 50 V DC 30 mA + IOUT < 25 mA 30000 A.t
Advantages
* Large aperture for cable up to O32mm * High isolation between primary and secondary circuits * Easy installation
Performance data
X
L
IOE TCIOE TCIOUT tr BW
Accuracy @ IPN, TA = 25C (excluding offset) Linearity error (1% of IPN .. IPN) Electrical offset current, TA = 25C Temperature coefficient of IOE ( 0..+60 C) (-40..+70 C) Temperature coefficient of IOUT (% of reading) Response time to 90% of IPN step Frequency bandwidth (1dB)
< 1 % of IPN < 1.0 % of IPN 4 mA 3.2 A/K 6.4 A/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
TA TS 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
Vb 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
Vd 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 panels thickness.
Remarks
* VOUT is positive when IP 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

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