Dwyer CT70 - Manual

Series CT Current Transformers
Specifications - Installation and Operating Instructions
Bulletin PC-CT
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Range: Option of 10/20/50 A or 100/150/200 A (depending on model).
Output Signal:
CT40/50-100: 4 to 20 mA;
CT40/50-102: 0 to 5 VDC;
CT60/70-100: 4 to 20 mA true RMS.
Power Requirements:
CT40/50-100: 12 to 40 VDC, loop powered;
CT40/50-102: Self powered;
CT60/70-100: 24 VDC, loop powered.
Accuracy:
CT40/50-100: 0.5% FS;
CT40/50-102: 1.0% FS;
CT60/70-100: 0.8% FS.
Temperature Limits: -4 to 122°F (-20 to 50°C).
Response Time:
CT40/50-100: 300 ms;
CT40/50-102: 100 ms;
CT60/70-100: 600 ms.
Isolation Voltage: 1270 VAC.
Frequency:
CT40/50-100: 20 to 100 Hz (sinusoidal waveforms only);
CT40/50-102: 50 to 60 Hz (sinusoidal waveforms only);
CT60/70-100: 10 to 400 Hz.
Enclosure Rating: UL 94V-O flammability rated.
Agency Approval: CE.
RANGE JUMPER
3/16 [4.5]
I.D. TYP.
2 PLACES 7/32
[5.59]
2-1/4
[57.15]
29/32
[22.86]
33/64
[13.21]
1/8
[3.18] 1-3/16
[29.97]
33/64
[13.21]
29/32
[22.86]
2-11/32
[59.69]
3-1/64
[76.71]
3-17/32
[89.66]
The Series CT40/50 Current Transformers combine a current transformer and a
signal conditioner into a single package. Units are designed for applications on
linear on sinusoidal loads. Series CT60/70 provide true RMS outputs on distorted
AC waveforms — ideal for nonlinear loads or noisy environments. Transformers
feature jumper selectable ranges and split-core case.
INSTALLATION
• Press the tab toward the sensor to open.
• After placing the wire in the opening, press the hinged portion down firmly until a
definite click is heard and the tab pops out fully.
• Sensors can be mounted in any position or hung directly on wires with a wire tie.
Keep split-core sensors clean. Silicone grease is factory applied
on the contacts. Be careful not to allow grit or dirt onto the
grease. Operation can be impaired if the mating surfaces do not have good
contact. Always check visually, before closing.
Leave at least one inch distance between the sensor and other
magnetic devices.
OUTPUT WIRING
• Connect control or monitoring wires to the sensor.
• Use up to 14 AWG copper wire.
• Tighten terminals up to 5 inch-pounds torque.
• Be sure the output load or loop power requirements are met (see diagram).
RANGE SELECTION
• Determine the normal operating amperage of the monitored circuit.
• Select the range that is equal to or slightly higher than the normal operating
amperage.
• Place the range jumper in the appropriate position according to selection.
NOTICE
NOTICE
LOAD
(-)
(+)
(-)
(+)
(-) (+) (-) (+)
1(-) 2(+)
OUTPUT INPUT
750A
500A
375A
24 VDC POWER LOAD
STANDARD CONNECTION
1(-) 2(+)
OUTPUT INPUT
750A
500A
375A
ALTERNATE CONNECTION
VOLTAGE OUTPUT CONNECTION
LOAD
(+)
(-)
2(+) 1(-)
OUTPUT
50A
HI
20A
MID 10A
LOW (OFF)
Loop Power Requirements:
CT40/50: Minimum loop voltage = 5 VDC + (loop resistance x 20 mA);
CT60/70: Minimum loop voltage = 12 VDC + (loop resistance x 20 mA). Output Load Requirements:
1 M
Ω recommended;
100 k Ω acceptable (allow for 1.3% error).
PC-CT:SSS-1000 8/23/10 2:35 PM Page 1