Setra CTC Operating Manual
Contactor
DI
DO
Control Power
Powe
r
Fan or Pump
Controller
Troubleshooting
2.56 (65)
2
.
7
(
6
9
)
1.73 (44)
1.03
(26)
Table 1: Troubleshooting
Symptom Action
CTC Analog Output Does Not Function Verify that the maximum amperage range has not been exceeded.
No CTC Ouput at Controller
Voltages or currents above the rated levels may damage the CTC.
CTCG420NN:
1. Verify that loop power between the CTC terminals and control panel
analog input is 18-30 VDC.
2. Turn off monitored load. Disconnect inputs to controller. Measure
current in power supply and CTC output loop with multimeter. Current
should be 4 mA with no load.
3. Check current loop polarity.
CTCGV05NN and CTCGV10NN:
1. Check amperage in monitored conductor.
2. Check polarity of sensor ouput and controller output.
3. Make sure clamp is fully closed.
4. Measure voltage across CTC output terminals.
Technical Specifications
CTCG420R1 CTCGV05R1 CTCGV10R1
Amperage Range (Selectable) 30/60/120A 30/60/120A 20/100/150A
Continuous Operating Current 120A 120A 150A
Output 4-20mA 0-5V DC 0-10V DC
Accuracy ±2% FS from 10% to 100% of Selected Range
Response Time 2 sec.
Dimensions 2.7 x 2.56 x 1.73 in.(69 x 65 x 44 mm)
Aperture Size 0.78 x 0.78 in. (18 x 20 mm)
Sensor Supply Voltage 24V DC (18-30V DC) Self-Powered
Output Relay Single-Pole, Single-Throw (SPST), Normally Open (NO), 10A @ 260V AC, 5A @ 30V DC
Actuation Coil 24V AC/DC
Max Relay Coil Current 30mA
Isolation Voltage 600V AC rms.
Temperature Range 5-140° F (-15 to 60° C)
Frequency Range 50/60Hz
Humidity Range 0-95% Non-Condensing
Compliance United States: UL Listed, File E317719 CCN NRNT, Under UL 508 Industrial Control
The performance specifications are nominal and conform to acceptable industry standards. For application of conditions
beyond these specifications, consult your local Setra representative. Setra Systems, Inc. shall not be liable for damages
from misapplication or misuse of its products.
Fax: 978-264-0292; Email: sales@setra.com/Web: www. setra.com
4 CTC Series - Current Transducer Clamped Installation Instructions
159 Swanson Road, Boxborough, MA 01719/800-257-3872;
Equipment
Canada: UL Listed. File E317719, CCN NRNT7, Under CAN/CAS C22.2 No. 14-05,
Industrial Control Equipment
Europe: CE Mark Low Voltage Directive 2006/95/EC, EMC Directive 2004/108/EC
For all CE technical questions, contact Setra System, USA. EU customers may contact Hengstler, GmbH,
Uhlandstr 49, 78552 Aldingen, Germany (Tel: +49-7424-890), Fax: +49-7424-89500.
SSCTC REV A 05/06/09
CTC Series - Current Transducer Clamped w/ Relay
Model CTCG420R1 / CTCGV05R1 / CTCGV10R1
Installation Instructions
Introduction
The Current Transducer Clamped (CTC) Series of analog
output current transducers are noninvasive devices designed
to monitor current flowing through a cable or wire. A cost
effective solution for monitoring load or proof of operation,
these units are ideal for monitoring current loads on pumps,
fans and blowers, and for sensing the status of heating coils
and lighting. CTC’s used for load trending over time are effective sensors for predictive maintenance programs.
These units are available with standard 4-20mA current loop,
0-5VDC, and 0-10VDC analog output. The voltage output
models derive excitation by magnetic induction from the current-carrying conductor (wire or cable), making these units
completely self-powered. The current loop output model
requires a 24VDC power supply.
The factory installed snap-on power relay facilitates the
remote startup and stopping of the motor. It requires a
separate 24 V AC/DC power supply also.
IMPORTANT: The Current Transducer Clamped (CTC) Series Current
Devices are intended to provide an input to equipment under normal
operating conditions. Where failure or malfunction of the CTC could
lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into
the control system. Incorporate and maintain other devices such as
supervisory or alarm systems or safety or limit controls intended to
warn of, or protect against, failure or malfunction of the CTC. READ
INSTRUCTIONS THOROUGHLY PRIOR TO INSTALLATION.
Installation
WARNING: Risk of Electric Shock
!
Disconnect power supply before making electrical connections. Contact with components carrying hazardous
voltage can cause electric shock and may result in
CTC Series - Current Transducer Clamped Installation Instructions 1
Dimensions
65 (2.56)
(2.70)
69
Figure 1: CTC Dimensions mm. (in.)
44 (1.73)
26 (1.03)
27 (1.06)
Mounting
1. Using the two screws (included), attach the mounting
bracket to the back of the electrical enclosure.
2. Snap the CTC into place on the mounting bracket.
Wiring
1. Disconnect power to the conductor cable at the power
source.
2. Place the split core around the power conductor cable,
and close the core until the core snaps shut.
3. Wire CTC output terminals to the control box Analog
Input (AI) terminal. Connect control box output to relay coil.
Connect power relay to control power and motor starter.
Note: Connector terminal blocks accept wire sizes from 12-22
AWG. Screw terminal torque is 4 lbf -in. or .5 N-m maximum.
4. Set input current range with front panel slide switch. (See
Setup)
5. Reconnect the power conductor cable (For wiring example,
see Figure 2.)
DDS
AI
Figure 2: CTCGA420NN
If the measured current is too low to be detected or is higher
Current >135A
Relay
4-20 mA
COILRELAY
120 60
AMPERAGE RANGE
30
Relay
4-20 mA
120
AI
DO
60
AMPERAGE RANGE
24 VDC
Power
Supply
DDC Controller
Motor Starter
30
Control Power
COILRELAY
Relay
0-5V DC
120
AI
DO
60
AMPERAGE RANGE
DDC Controller
Motor Starter
30
Control Power
COILRELAY
Relay
0-10V DC
150
AI
DO
100
AMPERAGE RANGE
DDC Controller
Motor Starter
20
Control Power
COILRELAY
than the maximum current rating of the CTC, use the following methods to increase or decrease current.
Setup
Setting Amperage Range
Set the amperage range slide switch to a level consistant with
your load.
If Measured Current is Too Low to Be Detected
Wrap the conductor (wire) through the sensing hole
and around the CTC body to produce multiple turns
CTCG420R1 = 30, 60, or 120 A
CTCGV05R1 = 30, 60, or 120 A
CTCGV10R1 = 20, 100, or 150 A
to increase the measured current Measured current =
actual current times the number of turns (see figure 3).
Figure 5: Setting CTC Amperage Range
Figure 3: CTC Shown with Four Turns
NOTE: Controller must be scaled to account for the extra
turns. If four turns pass through the sensor as shown, the
normal controller reading must be divided by four.
Wiring and Output
CTCG420R1
IMPORTANT: Failure to derate the current capacity could result in
damage to the CTC when using multiple turns to increase measured
current. Use the following formula to determine the new maximum
current:
New Maximum Current = CTC Current Rating/number of turns
For example, Model CTCG420NN with 4 turns = 120 A/4 = 30.0 A,
new maximum current.
To Monitor Currents Exceeding the Maximum
Current Rating of the CTC
For currents >120 A (Model CTCG420NN and
CTCGV05NN) or >150 A (Model CTCGV10NN):
Use a 5 A Current Transformer (CT) to reduce the current
passing through the CTC as shown in Figure 4. Run the
current transformer secondary wire through the sensing
hole. Terminate the 2 secondary wires of the 5 A current
transformer to each other, and then install the
5 A current transformer on the monitored conductor.
Set the CTC for lowest amperage range (20 or 30 A)
Figure 4: CTC with CT Transformer
2 CTC Series - Current Transducer Clamped Installation Instructions
Figure 6: CTCG420R1 Wiring
Scale Software as Shown
20 mA
Analog Ouput
4 mA
Figure 7: CTCG420R1 Linear Ouput
Input Amperage
CTCGV05R1
RETURNING PRODUCTS FOR REPAIR
Please contact a Setra application engineer (800-257-3872, 978263-1400) before returning unit for repair to review information
relative to your application. Many times only minor field adjustments
may be necessary. When returning a product to Setra, the material
should be carefully packaged, and shipped to :
Setra Systems, Inc.
159 Swanson Road
Boxborough, MA 01719-1304
Attn: Repair Department
To assure prompt handling, returned unit(s) must be accompanied
by Setra’s Return Order Form, completely filled out, found on Setra’s
web site at http://www.setra.com/tra/repairs/cal_rep.htm.
Notes: Please remove any pressure fittings and plumbing that you
have installed and enclose any required mating electrical connectors
Figure 8: CTCGV05R1 Wiring
Scale Software as Shown
5 VDC
and wiring diagrams.
Allow approximately 3 weeks after receipt at Setra for the repair and
return of the unit.
Non-warranty repairs will not be made without customer approval
and a purchase order to cover repair charges.
Analog Ouput
0 VDC
Input Amperage
30/60/120 A0 A
Figure 9: CTCGV05R1 Linear Output
CTCGV10R1
Figure 10: CTCGV10R1 Wiring
WARRANTY AND LIMITATION OF LIABILITY
ETRA warrants its products to be free from defects in materials and workmanship, subject
to the following terms and conditions: Without charge, SETRA will repair or replace
products found to be defective in materials or workmanship within the warranty period;
provided that:
a) the product has not been subjected to abuse, neglect, accident, incorrect
wiring not our own, improper installation or servicing, or use in violation of
instructions furnished by SETRA;
b) the product has not been repaired or altered by anyone except SETRA or its
authorized service agencies;
c) the serial number or date code has not been removed, defaced, or otherwise
changed; and
d) examination discloses, in the judgment of SETRA, the defect in materials or
workmanship developed under normal installation, use and service;
e) SETRA is notified in advance of and the product is returned to SETRA
transportation prepaid.
Unless otherwise specified in a manual or warranty card, or agreed to in writing and signed
by a SETRA officer, SETRA pressure and acceleration products shall be warranted for one year
from date of sale.The foregoing warranty is in lieu of all warranties, express, implied or statutory, including but not limited to, any implied warranty of merchantability for a particular
purpose.SETRA’s liability for breach of warranty is limited to repair or replacement, or if the
goods cannot be repaired or replaced, to a refund of the purchase price. SETRA’s liability for
all other breaches is limited to a refund of the purchase price. In no instance shall SETRA be
liable for incidental or consequential damages arising from a breach of warranty, or from the
use or installation of its products.
No representative or person is authorized to give any warranty other than as set out above or
to assume for SETRA any other liability in connection with the sale of its products.
Scale Software as Shown
10 VDC
30/60/120 A0 A
Analog Ouput
0 VDC
Input Amperage
20/100/150 A0 A
Figure 11: CTCGV10R1 Linear Output
CTC Series - Current Transducer Clamped Installation Instructions 3
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