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Secondary connector
Measuring instrument
of the current sensor
6
1
Power supply
4
5
9
Figure 2. Connection Example
3.
Insert the primary conductor into the primary conductor feed-through hole on the instrument.
Make sure that the direction of current flow matches the arrow on the instrument.
Correct
Incorrect
Direction
of current
Secondary
connector
Primary
Conductor
Pass only
a single 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.
CT1000A: 100 mA x 1500 = 150 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.
•
Pass only the conductor in which the current you want to measure is flowing through
the primary conductor feed-through hole.
Correct measurements cannot be taken if you pass a conductor with magnetic shielding or
conductors in which the currents are flowing in opposite directions through the feed-through
hole. (See the examples in Figure 3.)
•
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.
•
Do not apply excessive force to the secondary connector to prevent damage to the instrument.
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
: 30 mA
CEmax
I
: 2 mA
CEmin
Collector
Photocoupler operation:
ON : CT1000A is OK
(normal mode)
OFF : CT1000A is not OK
Emitter
CT1000A
Operation status output
Status
Operation Status (8-pin) Output Note
Normal
Less than 0.7 V (Typical)
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 (Ipm) is guaranteed to be greater than 1500 Apeak 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
(1000 Arms).
5. Specifications
Item
Specification
Current Rating
DC: 0 to 1000 A
AC: 1000 Arms, 1500 Apeak
Output Current
Primary rated current at 1000 A is 666.6 mA.
Current Transformation Ratio
1500:1
Direction of Current
Per the arrow printed on the main unit.
Accuracy
DC: ±(0.04% of reading + 30 μA)
50/60 Hz: ±(0.04% of reading + 30 μA) sine wave
Standard Conditions
Accuracy warranty period
12 months
Accuracy-guaranteed temperature
-40 to 85°C,
and humidity
20 to 80%RH (no condensation)
Temperature Coefficient
In the -40 to 18°C, 28 to 85°C ranges: ±0.01%/°C or less
Effect of Position of Conductor
Add ±(0.01% of reading)
Measurement Band (-3 dB)
DC to 300 kHz
Max. Allowable Continuous Input
1500 Apeak
For the maximum allowable continuous current with respect to
frequency, see figure 4.
Instantaneous Max. Allowable Input
5000 Apeak (0.1 sec. or less, reference value)
Maximum Rated Voltage to Ground
4
1000 V, CAT III
Load Resistance
0 to 1Ω (power supply voltage: ±14.25 V, 85°C)
Start-up time
15 s or less
Operating
Temperature
-40 to 85°C
environment
Humidity
20 to 80%RH (no condensation)
Altitude
2000 m or less
IM CT1000A-01EN 2/2
Current input
terminal
* Make sure that the total load
±
resistance including measuring
instrument's internal resistance and
0 V (common)
wiring resistance is within the
–15 V
specification.
+15 V
Using an magnetic
Using two parallel
-shielded conductor
conductors
Current flows in
both directions
V
+ : 4 ...+24 V
DC
+
-
Power
D-Sub
R
Supply
(9 pin)
8
Operation status
V+(V) - 0.4 V
R
(kΩ) =
min
3
30 mA
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.
Temperature: 23 ± 5°C
Voltage to earth: 0 V
Conductor position: center
Conductor: φ25 mm; length,300 mm or more; straight
2
Storage
Temperature
-40 to 85°C
environment
Humidity
20 to 80% RH (no condensation)
Altitude
3000 m or less
Power Supply Voltage
±(15 V ± 5%)
Maximum Rated Power Consumption Approx. 30 VA
Current Consumption
Approx. (120 mA + output current)
(at Power Supply Voltage)
External Dimensions
Approx. 128 (W) × 106 (H) × 54 (D) mm
(excluding the connector, conductor guide, and protrusions)
Diameter of Primary Current Hole
φ38.2 mm
Secondary Connector
D-Sub 9 pin
Weight
Approx. 1.3 kg
Recommended fastening torque
M5×4 steel screws 3.7 N•m
• Flat mounting
M6×2 steel screws 4.4 N•m
• Straight mounting
Safety standard
1
Compliant standards
EN 61010-1 1000 V
Measurement Category: CAT III
Pollution degree 2
Emissions
1
Compliant standards
EN 61326-1 ClassB, EN 55011 ClassB, Group1
Immunity
1
Compliant standards
EN 61326-1 Table 2 (for use in industrial locations)
Length of the secondary cable: 30 m or less (indoor wiring)
Measurement error may temporarily occur under immunity
environments.
Environmental standard
1
Compliant standards
EN 50581 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).
4
The maximum rated voltage to ground is rms for AC voltage and Vdc for DC voltage.
1000
100
10
10
100
1000
Frequency [Hz]
Figure 4. Derating of Primary Current by Frequency
109
104
90
109
128
Unless otherwise specified, tolerances are ±3%
(however, tolerances are ±0.3 mm when below 10 mm).
Figure 5. External Dimensions
6. Malfunction and Servicing
Malfunction
If you experience a breakdown in the instrument due to faulty manufacturing or accidents during
shipping, contact your nearest YOKOGAWA dealer.
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. Regulations and Sales in Each Country or Region
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 the authorized representative of Yokogawa Test & Measurement
Corporation for this product in the EEA. To contact Yokogawa Europe B.V., see the separate list of
worldwide contacts, PIM 113-01Z2.
Disposing the Product
When disposing of YOKOGWA products, follow the laws and ordinances of the country or region
where the product will be disposed of.
2
3
+25°C
+85°C
10000
100000
Unit: mm
2-
6.5×8.5
(2)
slotted hole
1
(2)
4-
5.5×7.5
slotted hole
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