Red Lion CTR User Manual

z TRUE RMS OUTPUT

z JUMPER SELECTABLE RANGES

z OUTPUT IS MAGNETICALLY ISOLATED FROM THE INPUT

z SPLIT-CORE CASE

GENERAL DESCRIPTION

CTR Series transducers combine a current transformer and a signal
conditioner into a single package. This provides higher accuracy, lower wiring
costs, easier installation and saves valuable panel space.

The CTR Series transducers are available in 4-20 mA output only. The CTR
Series provides a “True RMS” output on distorted waveforms found on VFD or
SCR outputs, and on linear loads in “noisy” power environments. Select the
CTR Series for variable speed or SCR controlled loads.

The current waveform of a typical linear load is a pure sine wave. In VFD and
SCR applications, however, output waveforms are rough approximations of a
sine wave. There are numerous spikes and dips in each cycle. CTR transducers
use a mathematical algorithm called “True RMS”, that integrates the actual
waveform over time. The output is the amperage component of the true power
(heating value) of the AC current waveform.True RMS is the only way to
accurately measure distorted AC waveforms.

SAFETY SUMMARY

All safety related regulations, local codes and instructions that appear in the
literature or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.

Do not use this unit to directly command motors, valves, or other actuators
not equipped with safeguards. To do so, can be potentially harmful to persons or
equipment in the event of a fault to the unit.

SPECIFICATIONS

1. OUTPUT SIGNAL: 4 to 20 mA DC, loop-powered, True RMS

2. OUTPUT LIMIT: 23 mA

3. FREQUENCY RANGE: 10-400 Hz (All Waveforms)

4. RESPONSE TIME: to 90% of step change 600 msec

5. ACCURACY: 0.8% FS

6. POWER SUPPLY: 24 VDC Nominal, 40 VDC Max.

7. INPUT RANGES: (Jumper Selectable)

8. ISOLATION VOLTAGE: 3 kV

9. CASE: UL 94V-0 Flammability rated thermoplastic

10. ENVIRONMENTAL: -4 to 122 °F (-20 to 50 °C)

0-95% RH, non-condensing

11. TORQUE RATINGS: 9 in-lbs

12. LISTING: UL 508 Industrial Control Equipment, CSA C22.2 No. 14-M95,

and CE Certified.

MODEL CTR - TRUE RMS AC CURRENT TRANSDUCER

CAUTION: Read complete

instructions prior to installation

and operation of the unit.

CAUTION: Risk of electric shock.

Bulletin No. CTR- X

Drawing No. LP0653

Effective 10/06

Tel [phone]

Fax [phone]

www.redlion.net

C

US LISTEDUS

LISTED

U

L

R

IND. CONT. EQ.

5T44

MODEL RANGE

MAXIMUM

6 secContinuous 1 sec

CTR05

10 A 125 A80 A 250 A
20 A 150 A110 A 300 A
50 A 215 A175 A 400 A

CTR2

100 A 300 A200 A 600 A
150 A 450 A300 A 800 A
200 A 500 A400 A 1000 A

DIMENSIONS In inches (mm)

Ø 0.19

2.25

(57.2)

(4.83)

1.18
(30)

3.04

(77.2)

3.53

(89.7)

2.40

(31)

0.45

(11.4)

0.85
(21.6)

0.85

(21.6)

INSTALLATION

Run wire to be monitored through opening in the sensor. Be sure the
monitored current flows in the same direction as the arrow on the sensor. The
CTR Series transducers work in the same environment as motors, contactors,
heaters, pull-boxes, and other electrical enclosures. They can be mounted in any
position or hung directly on wires with a wire tie. Just leave at least one inch
(25.4 mm) distance between sensor and other magnetic devices.

Split-Core Versions

Press the tab in the direction as shown to open the sensor. After placing the
wire in the opening, press the hinged portion firmly downward until a definite
click is heard and the tab pops out fully.

KEEP SPLIT-CORE SENSORS CLEAN.

Silicone grease is factory applied on the mating surfaces to prevent rust and
improve performance. Be careful not to allow grit or dirt onto the grease in the
contact area. Operation can be impaired if the mating surfaces do not have good
contact. Check visually before closing.

OUTPUT WIRING

Connect control or monitoring wires to the sensor. Use up to 14 AWG copper
wire and tighten terminals to 9 inch-pounds torque. Be sure the output load or
loop power requirements are met (see diagram).

Connection Notes:

 Captive screw terminals.

 14-22 AWG solid or stranded.

 Observe Polarity

 See label for ranges & jumper positions

Loop Voltage Requirements:

VL= 12V + (RLx 20 mA)

Where: VL= Min. Loop voltage

RL= Loop Resistance

RANGE SELECT

CTR series transducers feature field selectable ranges. The ranges are
factory calibrated, eliminating time consuming and inaccurate field setting of
zero or span.

1. Determine the normal operating amperage of your monitored circuit

2. Select the range that is equal to or slightly higher than the normal operating

amperage.

3. Place the range jumper in the appropriate position.

TROUBLE SHOOTING

1. Sensor Has No Output

A. Power supply is not properly sized. Check power supply voltage and

current rating.
B. Polarity is not properly matched. Check and correct wiring polarity.
C. Split Core models: The core contact area may be dirty. Open the sensor and

clean the contact area.

2. Output Signal Too Low

A. The jumper may be set in a range that is too high for current being

monitored. Move jumper to the correct range.
B. Output load too high. Check output load, be sure that VLdoes not exceed

40 VDC.
C. Monitored current is below minimum required. Loop the monitored wire

several times through the aperture until the “sensed” current rises above

minimum. Sensed Amps = (Actual Amps) x (Number of Loops). Count

loops on the inside of the aperture.

3. Output Signal Is Always At 4mA

A. Monitored load is not AC or is not on. Check that the monitored load is

AC and that it is actually on.

4. Output Signal Is Always At 20mA

A. The jumper may be set in a range that is too low for current being

monitored. Move jumper to the correct range.

DESCRIPTION

PART NUMBERS

CTR

200 A/4-20 mA, Split Case

50 A/4-20 mA, Split Case

CTR20000

CTR05000

ORDERING INFORMATION

Red Lion Controls

20 Willow Springs Circle

York PA 17406

Tel [phone]

Fax [phone]

Red Lion Controls AP

31, Kaki Bukit Road 3,

#06-04/05 TechLink

Singapore 417818

Tel [phone]

Fax [phone]

Red Lion Controls BV

Basicweg 11b

NL - 3821 BR Amersfoort

Tel [phone]

Fax [phone]

LIMITED WARRANTY

The Company warrants the products it manufactures against defects in materials and
workmanship for a period limited to two years from the date of shipment, provided the
products have been stored, handled, installed, and used under proper conditions. The
Company’s liability under this limited warranty shall extend only to the repair or
replacement of a defective product, at The Company’s option. The Company disclaims
all liability for any affirmation, promise or representation with respect to the products.

The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify
RLC against damages, claims, and expenses arising out of subsequent sales of RLC
products or products containing components manufactured by RLC and based upon
personal injuries, deaths, property damage, lost profits, and other matters which Buyer,
its employees, or sub-contractors are or may be to any extent liable, including without
limitation penalties imposed by the Consumer Product Safety Act (P.L. 92-573) and
liability imposed upon any person pursuant to the Magnuson-Moss Warranty Act (P.L.
93-637), as now in effect or as amended hereafter.

No warranties expressed or implied are created with respect to The Company’s products
except those expressly contained herein. The Customer acknowledges the disclaimers
and limitations contained herein and relies on no other warranties or affirmations.

MODEL NO.

Important!

Keep Contact

Area CLEAN!

To Open

Press Tab

Toward Hinge.