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Correct
Direction of current
Primary current
Conductor
Figure 3. Insertion of a Conductor
4.
Check that power is being supplied to the instrument, and then apply the primary current.
5.
Read the measured values. The following calculation is used to determine the current flowing
through the primary conductor.
Example: When the output current from the instrument's secondary connector (pin 6) is 100 mA.
CT2000A: 100 mA x 2000 = 200 A
Note
• If the operation status LED is off even when power is being supplied to the instrument, the
protection function may be activated. Immediately stop the primary current.
• Only pass conductors through the primary conductor feed-through hole if the current that you
want to measure is flowing through the conductors and their current directions are the same.
Correct measurements cannot be taken if you pass conductors with magnetic shielding or
conductors whose current directions are opposite of each other through the feed-through hole.
• Make sure the primary wiring and secondary wiring do not interfere with each other. The
secondary wiring may be affected by the primary wiring because it uses a very small current.
Make the secondary wiring as short as possible and maintain its distance from the primary
wiring, without allowing them to be parallel to each other. We recommend AWG24 or higher for
the secondary wiring material. Twisted-pair may be better than shielded cable for measurement
applications such as inverters.
•
The instrument outputs current. Connect the instrument to a measuring instrument with
current input. To connect the instrument to a measuring instrument with voltage input, use an
appropriate shunt resistor to connect the instrument to the voltage input terminals.
•
Configure your setup so that the load resistance of the measuring instrument connected to the
secondary signal output is within the specification range.
•
Correct measurements may not be possible in places where there is an extremely strong
external magnetic field besides the magnetic fields produced by the primary current of the
object to be measured or where there is a strong electric field.
Power Off If Abnormal Behavior Occurs
If you notice smoke or unusual odors coming from the instrument, immediately turn off the
measuring instrument supplying the power. Then, contact your nearest YOKOGAWA dealer.
Status circuit diagram
Active Low Output
I
CEmax
I
CEmin
Photocoupler operation:
ON :
CT2000A is OK
(normal mode)
OFF : CT2000A is not OK
CT2000A
Operation status output
Status
Operation Status (8-pin) Output Note
Normal
Less than 0.7 V
Overloaded V+
Overload Protection
The overload occurs when the primary current Ip exceeds a trip level such that the fluxgate detector
becomes completely saturated and, consequently, the current sensor will switch from normal
operation to overload mode.
This trip level is guaranteed to be greater than Ipm (3000Apeak) and its actual value depends on
operating conditions such as temperatures and measuring resistance.
During the overload mode, the current sensor generates and outputs a low frequency signal.
The measuring operation resumes when the primary current returns in the measuring range
between –Ipn and +Ipn (2000Arms).
Test Winding Connector
The test winding connector is used to test the operation of the current sensor.
When a current is applied between the positive and negative Ip test pins, a current that corresponds
to the test current winding number of 200 and current transformation ratio of 2000:1 is output from
the secondary signal output pin.
Example: When 1 A is applied between the positive and negative Ip pins, 100 mA is output from the
secondary signal output pin.
Note
To measure the current of the primary conductor that has been passed through the through hole,
do not connect anything to the test winding Ip+ or Ip- pin. If connected, errors may be induced in
the sensor output.
5. Specifications
Item
Specification
Current Rating
DC: 0 to 2000 A
AC: 3000 Apeak
Output Current
Primary rated current at 2000 A is 1A.
Current Transformation Ratio
2000:1
Direction of Current
Per the arrow printed on the main unit.
Accuracy
DC: ±(0.05% of reading+30 μA)
50/60 Hz: ±(0.05% of reading+30 μA) sine wave
Standard Conditions
Voltage to earth: 0V
Conductor position: center
Conductor: φ25 mm; length,300 mm or more; straight
Accuracy warranty period
12 months
Effect of Position of Conductor
Add ±(0.01% of reading)
Measurement Band (-3dB)
DC to 40 kHz
Temperature Coefficient
In the -40 to 18°C, 28 to 85°C ranges: 0.01%/°C
Max. Allowable Continuous Input 3000 Apeak
Derating of Max. Allowable Input For the maximum allowable continuous current with respect to
frequency, see figure 4.
Instantaneous Max. Allowable Input
10000 Apeak
(0.1 sec. or less, reference value)
Maximum Rated Voltage
1000 Vrms, CAT III
Load Resistance
0 to 1Ω(power supply voltage: ±14.25 V, 25°C)
Operating
Temperature
-40 to 85°C
environment
Humidity
20 to 80%RH (no condensation)
Altitude
2000 m or less
IM CT2000A-01EN 2/2
Incorrect
Using an magnetic
Using two parallel
-shielded conductor
conductors
Current flows in
both directions
V
+ : 4..+24 V
+
DC
: 30 mA
-
Power
D-Sub
R
Supply
(9 pin)
: 2 mA
Collector
8
Operation status
V+(V) - 0.4 V
R
(kΩ) =
min
3
30 mA
Emitter
V+(V) - 0.4 V
R
(kΩ) =
max
2 mA
USER SIDE
The LED turns on.
The LED turns off. A low frequency signal is output
as a secondary signal output.
Storage
Temperature
-40 to 85°C
environment
Humidity
20 to 80% RH (No condensation)
Altitude
2000 m or less
External Dimensions
Approx. 230.5(W) x 219.5(H) x 75.5(D) mm
(excluding the connector, conductor guide, and protrusions)
Diameter of Primary Current Hole φ70 mm
Secondary Connector
D-Sub 9 pin
Test Wiring Connector
M8 circular 3 pin
Test current: 1 A max.
Number of test windings: 200
Weight
Approx. 4.2 kg.
Power Supply Voltage
±(15 V ± 5%)
Maximum Rated Power Consumption Approx. 35 VA
Current Consumption (at Power
Approx. (225 mA + output current)
Supply Voltage)
Recommended fastening torque
•Flat mounting
M6×4 steel screws 5.5 Nm
M6×4 steel screws 5.5 Nm
•Straight mounting
Safety standard
1
Compliant standards
EN61010-1 1000 Vrms
Measurement Category: CAT III
Pollution degree 2
Emissions
Compliant standards
EN61326-1 ClassB, EN55011 ClassB, Group1
Immunity
Compliant standards
EN61326-1 Table 2 (for industrial locations)
Environmental standard
Compliant standards
EN50581 Monitoring and control instruments including industrial
monitoring and control instruments.
1 Applies to products with CE marks. For information on other products, contact your nearest YOKOGAWA dealer.
2 This instrument is measurement category III product. Do not use it for Measurement Categories IV.
Measurement category O applies to measurement of other circuits that are not directly connected to a main power
supply.
Measurement category II applies to electrical equipment that is powered through a fixed installation, such as a
wall outlet wired to a distribution board, and to measurement performed on such wiring.
Measurement category III applies to measurement of facility circuits, such as distribution boards and circuit
breakers.
Measurement category IV applies to measurement of power source circuits, such as entrance cables to buildings
and cable systems, for lowvoltage installations.
3 Pollution Degree applies to the degree of adhesion of a solid, liquid, or gas which deteriorates withstand voltage or
surface resistivity. Pollution degree 2 applies to normal indoor atmospheres (with only non-conductive pollution).
10000
1000
100
10
1
1
10
100
1000
Frequency [Hz]
Figure 4. Derating of Primary Current by Frequency
（2）
204
190.5
145
4-Φ7x9 hole
（2）
204
230.5
Unless otherwise specified, tolerances are ± 3% (however, tolerances are ± 0.3 mm when below 10 mm).
Figure 5. External Dimensions
6. Servicing
If you encounter any problems during use, or if the instrument does not appear to be operating
normally, contact your nearest YOKOGAWA dealer.
7. Warranty
If you experience a breakdown in the instrument due to faulty manufacturing or accidents during
shipping, contact your nearest YOKOGAWA dealer.
8. Appendix
Waste Electrical and Electronic Equipment (WEEE), Directive
(This directive is valid only in the EU.)
This product complies with the WEEE Directive marking requirement. This marking
indicates that you must not discard this electrical/electronic product in domestic
household waste.
Product Category
With reference to the equipment types in the WEEE directive, this product is classified
as a "Monitoring and Control instruments" product.
When disposing products in the EU, contact your local Yokogawa Europe B. V. office.
Do not dispose in domestic household waste.
Authorized Representative in the EEA
Yokogawa Europe B. V. is Authorized Representative of Yokogawa Test & Measurement Corporation
in the EEA for this Product. To contact Yokogawa Europe B. V., see the separate list of worldwide
contacts, PIM 113-01Z2.
Disposing of the Instrument
When disposing of the instrument, follow the laws and ordinances of your country or region.
2
3
23℃
85℃
10000
100000
Unit: mm
4-Φ7x9 hole
1.4
65
69.5
75.5
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