3.
User's
Manual
751574
Current Transducer
Insert the primary conductor into the primary conductor feed-through hole on the device.
Make sure that the direction of current flow matches the arrow on the device.
Correct
Incorrect
Conductor
Using an earth-shielded
conductor
Direction of current
Using two parallel
conductors
Current flows in
both directions
Primary current
Thank you for purchasing the Current Transducer (Model 751574). In order to take advantage of all the
functions of the transducer and to ensure proper use, please read this user’s manual thoroughly before
beginning operation.
This device is a current sensor with a 1500:1 current transformation ratio that performs transformation on
the primary current. After familiarizing yourself with the performance and functions of this device, you will
be able to use it in conjunction with measuring instruments from Yokogawa Electric.
Figure 3. Insertion of a Conductor
4.
5.
Apply the primary current.
Read the measured values. The following calculation is used to determine the current flowing
through the primary conductor.
Example: Given a current of 100 mA being output from pin 6 of the device’s secondary
connector, 100 mA x 1500 = 150 A.
Note
• Never apply a current exceeding the allowable input range to the current input terminal of the
instrument. A current equivalent to the primary rated current may flow from the output terminal
even when the applied current is stopped. In that case, turn the power switch OFF and then
back ON again. Then, the instrument may return to normal once a current of the allowable
input range is applied. If it does not, contact your dealer or nearest YOKOGAWA
representative.
• Configure your setup so that the load resistance of the measuring instrument connected to the
secondary signal output is 2.5 Ω or greater.
• When measuring phase difference in voltage and current using an instrument such as a digital
power meter, make sure that the current flows in the same direction as the arrows on that
instrument.
• Avoid locations with extremely strong external magnetic fields as they may cause
measurement errors.
Disk No. BA13
1st Edition : September 2001 (YK)
All Rights Reserved, Copyright © 2001, Yokogawa Electric Corporation
IM 751574-01E
1st Edition
1. Safety Precautions
The following safety markings are used in this manual.
CAUTION
Note
4. Specifications
Current Rating
DC: 0 to 600 A
AC: 600 Apeak
Output Current
Primary rated current at 600 A is 400 mA.
Current Transformation Ratio
1500:1
Direction of Current
Per the arrows printed on the main unit.
Accuracy
DC
±(0.05% of reading+40 µA)
50/60 Hz
±(0.05% of reading+40 µA) sine wave
Standard Conditions
23±5°C
30 to 70%RH
Primary current
2 A to 600 A
Power supply voltage DC±(15 V ± 0.75 V)
Common mode voltage 0 V
Conductor
φ25 mm; length,
300 mm or more; straight
Within 3 months after calibration
Accuracy 12 Mo. after Calibration Add the error in the reading value (reading) x 0.5 to the above accuracies.
Effect of Position of Conductor
Add ±(0.05% of reading)
Measurement Band
DC to 100 kHz (-3dB)
Temperature Coefficient
In the 10 to 18°C, 28 to 50°C ranges: 0.01%/°C
Max. Allowable Continuous Input 600 Apeak
Deleting of Max. Allowable Input Limited as shown in figure 4 when the primary current frequency exceeds
400 Hz. However, these are merely reference values.
Instantaneous Max. Allowable Input
3000 Apeak 0.1 sec. or less (reference value)
Load Resistance
2.5 Ω or more (see figure 5)
Operating Temperature
10 to 50°C
Operating Humidity
20 to 80%RH (no condensation)
Storage Temperature
0 to 60°C
External Dimensions
Approx. 122(W) x 98(H) x 57(D) mm
(excluding the connector and conductor guide)
Diameter of Primary Current Hole φ26 mm
Secondary Connector
D-Sub 9 pin
Weight
Approx. 1 kg.
Emission
Conforms to EN61326 standards
Immunity
Conforms to EN61326 standards
Power Supply Voltage
±(15 V ± 5%)
Power Consumption
Approx. 5 VA (when the secondary output current is 0)
Current Consumption
Approx. (330 mA + output current)
Max. Tightening Torque for the Attachment Screw
0.2 kgm
Accessories
User’s manual: 1 pc.
Opt. Accessories (Sold Separately)
• D-Sub 9 pin connector (plug, part number B8200JQ): 1 pc.
• Load resistor (2.5 Ω, part number B8200JR, accuracy of resistance value
±0.1%, temp. coefficient 22 ppm/°C): 1 group of 4 10-Ω resistors
connected in parallel yielding 2.5 Ω
WARNING
• Beware of electric shock.
Do not perform measurement if the case is damaged.
Do not operate the device with wet hands, in a rainy or humid environment, or if
any water droplets are visible on it.
Condensation may appear if sudden changes in temperature occur. If this
happens, let the device acclimatize to the new temperatures for at least one
hour, then refrain from using the device until confirming that there is no
condensation.
• Do not disassemble the device.
The device should be disassembled by qualified personnel only.
• Use the correct power supply.
Ensure that the source voltage matches the voltage of the power supply before
turning ON the power.
• Do not use with non-insulated conductors or cables*.
Use conductors or cables with reinforced insulation.
• Although it is well-insulated, do not touch the device or secondary output cable
when voltage is being applied to the primary conductor.
• Connect the secondary signal output before supplying power to the device.
• Do not disconnect the secondary output while power is being supplied to the
device.
• Do not apply primary current before supplying power to the device.
• Do not input excessive current as malfunction or damage may result.
• Do not allow vibrations to disturb the device after it has been set in place as
damage may result.
* An insulation system having the same level of shock protection as double
insulation. Consult with your cables’ manufacturer for details.
2. Names of Parts
Reverse
Primary conductor
feed-through hole
Secondary connector signal allocation
Attachment
screw holes
(M6 x 10)
Conductor
guide
1
Secondary connector
5
Pin No.
1 to 3
4
5
6
7,8
9
Signal
[Do not connect]
0 V power supply input
–15 V power supply input
Secondary signal output
[Do not connect]
+15 V power supply input
Pin
assignment
6 9
Figure 1. Names of Parts and Pin Assignments
1000
Maximum Allowable
Input Current [Arms]
Front
Load Resistor [Ω]
WARNING
Danger. Refer to the corresponding location on the device. This symbol appears on dangerous
locations on the device which require special instructions for proper handling or use. The same
symbol appears in the corresponding place in the manual to identify those instructions.
Calls attention to actions or conditions that could cause serious injury or death to the user, and
precautions that can be taken to prevent such occurrences.
Calls attention to actions or conditions that could cause damage to the instrument or user’s data,
and precautions that can be taken to prevent such occurrences.
Calls attention to information that is important for proper operation of the instrument.
100
10
1
3. Operation
10
100
1000
10000
100000
Frequency [Hz]
Figure 4. Deleting of Primary Current by Frequency
CAUTION
100
90
80
70
60
50
40
30
20
10
0
0
50
100 200 300 400 500 600
150 250 350 450 550
Primary Current [A]
Figure 5. Deleting of Primary Current
by Load Resistance
CURRENT
Ensure that the current flowing to the conductor of the object to be measured is
within the measuring range. If the current exceeds the measuring range, the
device may overheat and become damaged.
122
73
M6 x 10 (2)
25
Operating Procedure
1. Connect the secondary connector on the device to the current input terminal on the measuring
instrument, and connect to 0 V (common) and ±15 V on the power supply.
2. Set up the measuring instrument and power supply to match the specifications of the current
transducer. Carefully read the user’s manuals for your measuring instrument and power
supply to obtain the correct procedure for making the connections.
62
98
23.5
57
65
Measuring instrument
Secondary connector
6
φ28.1
φ26hole
Rb
Rb: Load resistor*
Unit : mm
Current input
terminal
Figure 6. External Dimensions
5. Servicing
Power supply
4
5
9
0 V(common)
–15 V
+15 V
* Set so that the measuring instrument's
internal resistance plus the load
resistance (Rb) is 2.5 Ω or greater.
If you encounter any problems during use, or if the device does not appear to be operating normally,
contact Yokogawa Electric Engineering services or the dealer from whom you purchased it.
6. Warranty
If you experience a breakdown in the device due to faulty manufacturing or accidents during shipping,
contact Yokogawa Electric Engineering Services or the dealer from whom you purchased the device.
Figure 2. Connection Example
IM 751574-01E 1st Edition