100518/20 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
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IPN = 100 .. 1000 A
Features
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
Advantages
Large aperture for cable up to ●
Ø32mm
High isolation between primary ●
and secondary circuits
Easy installation ●
Applications
VFD Controlled Loads ●
VFD output indicates how the
motor and attached load are
operating.
SCR Controlled Loads ●
Acurate measurement of phase
angle red or burst red (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.
Application domain
Energy and Automation ●
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.
Electrical data
Primary Nominal Primary AC Current Output current Type
DC & AC Current Max. Peak Value 1)
IPN (A.t.RMS) IP (A) IOUT (mA DC)
100 600 4-20 DHR 100 C420
200 600 4-20 DHR 200 C420
300 1000 4-20 DHR 300 C420
400 1000 4-20 DHR 400 C420
500 2) 1800 4-20 DHR 500 C420
600 2) 1800 4-20 DHR 600 C420
1000 2) 1800 4-20 DHR 1000 C420
RL Load resistance < 300 W
VC Supply voltage + 20 .. 50 V DC
IC Current consumption 30 mA + IOUT
ISL Output current limitation < 25 mA
ÎP Overload capability (Ampere Turns) 30000 A.t
Performance data
X Accuracy @ IPN, TA = 25°C (excluding offset) < ± 1 % of IPN
eL Linearity error (1% of IPN .. ± IPN) < ± 1.0 % of IPN
IOE Electrical offset current, TA = 25°C 4 mA
TCIOE Temperature coefcient of IOE ( 0..+60 °C) ± 3.2 mA/K
(-40..+70 °C) ± 6.4 mA/K
TCIOUT Temperature coefcient of IOUT (% of reading) ± 0.1 %/K
tr Response time to 90 % of IPN step < 150 ms
BW Frequency bandwidth (± 1 dB) DC 20..6000 Hz
General data
TA Surrounding operating temperature - 40 .. + 70 °C
TS Surrounding storage temperature - 40 .. + 85 °C
m Mass 260 g
IPxx Protection degree IP20
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
IPN, whereas the output is limited by the above specied 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.
100518/20 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
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Current Transducer DHR-C420
Isolation characteristics
Vb 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 eld
Vd Rms voltage for AC isolation test 4), 50 Hz, 1min 4.0 kV
Vw Impulse withstand voltage 4), 1.2/50 uS 7.3 kV
dCp Creepage distance 7.2 mm
dCl Clearance distance 7.2 mm
CTI Comparative tracking index (Group I) > 600
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 lling the aperture) and secondary.
Transfer characteristics
Output in mA
20
4
+Ipn
- Ipn
100518/20 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
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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 specications.
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 qualied 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.
100518/20 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
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Dimensions DHR-C420 (in mm. 1 mm = 0.0394 inch)
DHR-C420
Output Connector
1(Vcc) 2(Iout) 3(NC) 4(GND)
(+)
(-)
24 VDC Power
DHR
Load
(-)
(+)
Connections
•Wires up to ∅ 2 mm
•Female connector provided (spring terminal blocks)
•User-friendly spring-cage connection for no-tool
direct conductor connection
Mechanical characteristics
• General tolerance ±1 mm
• Primary aperture ∅ 32.0 mm
• Panel mounting 4 holes ∅ 4.6 mm
• Distance between holes 70 mm & 78 mm
(see above drawings)
For panel mounting, replace M4 screws by new one (not supplied)
with appropriate length to panel´s thickness.
Remarks
•The temperature of the primary conductor can not exceed 90 °C.
•Dynamic performances are the best with a primary conductor
completely filling the primary aperture.
•This is a standard model. For different versions (supply voltages,
different outputs, bidirectional measurement,...), please
contact us.
Ip
Is
OUT
+24VDC
GND
Ip
Is
OUT
+24VDC
GNDGND
080725/16 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 4/4
40
60
32
90
10
15
70
4.60
25
22.28
6.80
6.80
8.30
2.50
6
4.60
78
7
33.80
25
4
70
8.30
15
25.60
• • •• • • • •••••••••••
•• ••••••••••••••
•• • ••• •• •••••••••
Dimensions DHR-C420 (in mm. 1 mm = 0.0394 inch)
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Connections
Wires up to Ø 2 mm ●
Female connector provided (spring terminal blocks) ●
User-friendly spring-cage connection for no-tool direct ●
conductor connection
Mechanical characteristics
General tolerance ±1 mm ●
Primary aperture Ø 32.0 mm ●
Panel mounting 4 holes Ø 4.6 mm ●
Distance between holes 70.0 mm & 78 mm ●
(see above dimensions)
For panel mounting, use M4 screws (not supplied) with
appropriate length to panel´s thickness, and tighten to
0.75Nm +/-20% torque.
Remarks
The temperature of the primary busbar can not exceed ●
90 °C.
Dynamic performances are the best with a primary ●
busbar completely lling the primary aperture.
This is a standard model. For different versions ●
(supply voltages, different outputs, bidirectional
measurements...), please contact us.