AC/DC Current transducer DHR-C420 I = 100..1000 A
PN
The transducer for the electronic measurement DC & distorted AC
waveforms current, with galvanic isolation between the primary (High
power) and the secondary circuits (Electronic circuit). True RMS 4-
20mA current output.
Electrical data
Features
Primary Nominal Primary AC Current Analogue Output Type
DC & AC Current Max. Peak Value Signal
VFD and SCR waveforms current
I (A.t.RMS) I (A) I (mADC)
PN P OUT
measurement
100 600 4-20 DHR 100 C420
True RMS output
200 600 4-20 DHR 200 C420
300 1000 4-20 DHR 300 C420 4-20mA current output
400 1000 4-20 DHR 400 C420
Panel mounting
500 1800 4-20 DHR 500 C420
Eliminates insertion loss
600 1800 4-20 DHR 600 C420
1000 1800 4-20 DHR 1000 C420
R Load resistance < 300
L
Advantages
V Supply voltage (loop powered) +20 .. 50 V DC
C
I Current consumption 30 mA + I
Large aperture for cable up to
C OUT
Limitation of output current < 25 mA
32mm
Overloaded input current (Ampere Turns) 30000 A.t
High isolation between primary and
secondary circuits
Accuracy-Dynamic performance data
Easy to mount
X Accuracy @ I , T = 25C (without offset) < 1 % of I
PN A PN
e Linearity (1% of I .. I ) < 1.0 % of I
L PN PN PN
Applications
I Electrical offset current, T = 25C 4 mA
OE A
I Thermal drift of I (-20..+60 C) 1.6 A/K
OT OE
VFD Controlled Loads:
(-40..+70 C) 3.2 A/K
VFD output indicates how the motor
TCe Thermal drift of the gain (% of reading) 0.1 %/K
G
and attached load are operating.
t Response time @ 90% of I < 150 m s
r P
SCR Controlled Loads:
f Frequency bandwidth (1%) DC 20..6000Hz
Acurate measurement of phase
angle fired or burst fired (time
General data
proportioned)
T Ambient operating temperature -40 .. +70 C
A
SCRs. Current measurement gives
T Ambient storage temperature -40 .. +85 C
S
faster response than temperature
m Mass 260 g
measurement.
Protection type IP20
UL94 classification V0
Switching Power Supplies and
Electronic Ballasts:
True RMS sensing is the most
accurate way to measure power
supply or ballast input power.
Notes : Installation and maintenance should be done with power supply disconnected.
The operator must have accrediation to install this material.
The users must take care of all protection gurantee against electrical shock.
050526/4
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. Page 1/3
LEM Components www.lem.comCurrent Transducer DHR-C420
Isolation characteristics
V Rated Voltage 1000 V
b
with IEC 61010-1 acc. to the 61326 standards and following conditions :
- Single insulation
- Over voltage category CAT III
- Pollution degree PD2
- None uniform field
V R.m.s. voltage for AC insulation test, 50Hz, 1min 5 kV
d
dCp Creepage distance 11 mm
dCl Clearance distance 11 mm
CTI Comparative tracking index (Group I) 600
Notes :
Output polarity with DC input
Output in mA
20
4
-Ipn
+Ipn
050526/4
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. Page 2/3
LEM Components www.lem.com