CRMagnetics Catalog

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Looping the primary current-carrying wire several times through the
window opening may change the scaling factor. The “actual”
measurement range will be the nameplate rating of the transducer
divided by the number of wire passes. For example, the CR4220-30
has a nameplate rating of 0-30 AAC. Three passes of the wire through
the window opening will then provide an effective range of 0-10 AAC
(30/3).
A university campus needs to monitor the power coming into each
building and record the results at a central location. The incoming
feeds are rated at 480/277, 2000 amps, 3-phase, 4-wire Y.
An ANSI Metering Class Current Transformer, part number CR170RL-
202, is selected from the CR Magnetics Current Transformer Catalog
Section F to convert the full-load current down to 5 Amps for input to
the transducer. The voltage legs are connected directly to the
transducer.
LOOP-POWERED AC CURRENT TRANSMITTER
POWER TRANSDUCER
INDUSTRIAL APPLICATIONS FOR ELECTRICAL TRANSDUCERS
Typical Applications
DC current may be monitored by using the voltage transducer
attached to a resistive shunt. The illustration shows a CR5310-.05
transducer with an input range of 0-50 mV attached to a standard
50 mV resistive shunt. The output is attached to a standard 0-5
VDC panel meter.
DC CURRENT MONITORING
This illustrates a typical application for monitoring the voltage
supply to a motor. The transmitter is attached to the incoming
voltage supply leads. Using the CR4600 Series for AC Voltage
Sensing, the transmitter output is attached to standard 4-20 mA,
loop-powered panel meter. The transmitter may also be attached to
a PLC to monitor for over/under voltage and phase loss.
VOLTAGE MONITORING
L1 L2 L3 L4
H1
H1
H1
X1
X1
X1
LOAD
1
2
3
4
9
8
7
6
5 + -
1
2
3
4
9
8
7
6
5
M
X X X X
+ -
L1 L2
1
2
3
4
9
8
7
6
5 Transducers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Company
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