t.a.c. CP-8551, CP-8552 General Instructions Manual

Application

The CP-8551 and CP-8552 transducers receive a variable electronic input signal and produce a 3 to 15 psig (21 to 103 kPa) pneumatic output signal to position pneumatic damper and valve actuators in HVAC systems.

Features

• Durable enclosure with easily accessible wiring

terminations

• Panel or DIN rail mounting for quick, snap-on

installation

CP-8551 & CP-8552

Electronic to Pneumatic Transducers

General Instructions

• Two-wire loop powered or three-wire voltage input

• High accuracy with low hysteresis

• Long-term driftless operation with high repeatability

• Low air consumption and large air flow capacity

• Control input protection from short circuit or reverse

polarity

Applicable Literature

• TAC Environmental Controls Reference Manual,

F-21683

• EN-123 Air Quality Requirements for Pneumatic

HVAC Control Systems Engineering Information, F-22516

• TAC Pneumatic Products Catalog, F-27383

SPECIFICATIONS

Transducer Inputs

Input Signal:

CP-8551, 4 to 20 mA. CP-8552, 4 to 20 mA, 6 to 9 V, and 0 to 10 V.

Input Impedance:

CP-8551, 550 ¾ maximum, 400 ¾ minimum. CP-8552, 550 ¾ maximum, 400 ¾ minimum, 4 to 20 mA input; >10,000 ¾ volt age input.

Power Input Requirements:

4 to 20 mA Input, None. 0 to 10 and 6 to 9 V Input, Requires 20 to 30 Vac, 3.9 VA (CP-8552), 50/60 Hz, or 24

to 30 Vdc power supply, 1.6 watt s maximum.

Input Range Selection:

CP-8551, None. CP-8552, Jumper selectable.

Air Supply Required: 20 psig (138 kPa) nominal, 30 psig (207 kPa) maximum. Clean,

dry, oil free air required (refer to EN-123, F-22516). Air Consumption for Siz ing Air Compressor: Maximum 0.012 sc fm (5. 66 m l/s) @ 20 psig (138 kPa) supply.

Air Capacity for Sizing Air Mains: Minimum 550 sci m (150.24 ml/s). Air Connections: Male barbed fittings for flexible 1/4" O.D. pneumatic tubing. Wiring Co nn ecti o n s: Screw terminals for use with 16 to 22 AWG wire.

Transducer Outputs

Output Signal: 3 to 15 psig (21 to 103 kPa) nominal, Direct Acting. Maximum Pneumatic Output: 1 to 18 psig (7 to 124 kPa). Output Air Capacity & Pressure: 515 sci m (141 ml /s) maxi mum with a 20 psi g (138 kPa)

supply.

Operating Charact eristics:

Linearity, ±1% of span @ 75°F (24° C). Hysteresis, 0.75% of span @ 75°F (24° C).

Adjustments:

CP-8551, None. CP-8552,

4 to 20 mA Range None. 0 to 10 and 6 to 9 V Range Adjustable start point and span potentiometers.

Environment

Ambient Temperature Limi ts:

Shipping and Storage, -40 to 160°F (-40 to 71° C).

Operating, 32 to 140°F (0 to 60° C). Humidity: 5 to 95% R.H., non-condensing. Locations: NEMA Type 1. Agency Listings:

UL 873: Underwriters Laboratories (File #E9429 Category Temperature-Indicating and

Regulating Equipment).

CSA: Certified for use in Cana da by Underwriters Laborator ies. Canadian Standards

C22.2 No. 24-93.

European Community: EMC Directive (89/336/EEC). Low Voltage Directive

(72/23/EEC).

Accessories

AL-3X 2 Pressure gauge. K-335 In-line air filter. B-371 Branch tee. M-127 90° drop ear elbow . M-636 4 in. T and B wire tie. P-610 35 mm DIN ra il (1-3/8 W x 36 L x 3/10 H in).

Note:

Order the AL-3X2 Pressure Gauge, the B-371 Branch Tee, and the M-127 90° Drop Ear Elbow sep aratel y and fi eld ass emble to prov ide opt ional pressur e indi catio n for the CP-8551 and CP-8552 transducers.

TYPICAL APPLICATIONS (wiring diagram)

+4 to 20 mA Current Input Signal

Signal Common

24 Vac/dc

Power Common Signal Common

Voltag e I np u t Si gn al

CP-8551

—

Figure-1 CP-8551 Typical Wiring.

CP-8552

24H

COM

+IV1

When multiple CP-8552s or other devices are powered

by a commo n source, uniform wiring polar ity must be maintained between all 24H and COM terminals. Check to ensure that the controller’s COM terminal is not connected to any other ground reference.

3 to 15 psig

(21 to 103 kPa

to controlled dev ic e

(direct acting)

3 to 15 psig

(21 to 103 kPa

to controlled device

(direct acting)

Figure-2 CP-8552 Typical Wiring for Voltage Input.

Signal Common

+4 to 20 mA Current Input Signal

COM

+IV1

CP-8552

3 to 15 psig

(21 to 103 kP a

to controlled device

(direct ac t in g)

Figure-3 CP-8552 Typical Wiring for Current Input.

INSTALLATION Inspection Inspect the pack age for damage. If damaged, notify the appropriate carrier immediately.

If undamaged, open the package and inspect the device for obvious damage. Return damaged products.

Requirements • Wiring diagrams .

• Tools (not provided):

– Screwdriver for mounti ng screws. – Drill and drill bit for mounting screws.

• Appropriate accessories.

• Two (2) # 6 mounting screws (not provided).

• M-636 4 in. T and B wire tie (not provided).

• Training: Installer must be a qualified, experienced technician.

Precautions

General

Warning:

• Disconnect the power supply (line power) before installation to prevent possible

electrical shock and equipment damage.

• Make all connections in accordance with the wiring diagram and in accordance with

national and local electrical codes. Use copper conductors only.

• Do not exceed the ratings of the device(s).

Supply Air

Caution:

• Particles in the air supply larger than 0.03 microns (4 mPa) may adversely af fect the

reliabili ty and life of the transducer. If air supply is questionable, install a K-335 in line air filter between the main air supply and the main air port of the device.

• A refrigerated ai r dryer, particulat e fi lter, and coalescing fi lter should provide a quality

air supply (refer to EN-123, F-22516).

• Compressor oil must be non-paraffin mineral base or naphtha base. Syntheti c base

oils will destroy pneumatic controls and void the warranty.

Location

Caution:

• NEMA Type 1 devices are inten ded for indoor use primarily to provide a degree of

protectio n against contact with the encl osed equipment.

• Do not locate unit in areas subject to incidental contact, vibration, severe mechanic al

shock, excessive moisture, or cor rosive fumes.

Mounting Refer to Figure-5 for mounting dimensions.

Caution:

upright position. (Refer to "UP" arrow on printed circuit board.)

1. Remove transducer cover by grasping both sides of cover and pulling gently.

2. Select the mounting location.

3. Rail mount transducer on a vertical surface by snapping to a 35 mm DIN mounting r ail

4. Pull wires through bottom of enclosure and make necessa ry connections.

5. Position wires to clear the wiring access hole in the cover.

6. Use a small plastic wire tie to secure the wires to the strain relief tab provided on the

7. Replace cover and make pneumatic connections.

The CP-8551 and CP-8552 transdu cers must be mounted within 5° of the

(not provided ) or wall mount with two screws (not provided). Multiple units can be mounted side by side on a DIN mount ing rail.

mounting base to the left of the wiring terminations (Figure-4 ).

Wiring Use 16 to 22 AWG wire for Class II wiring terminals. Use flexible 1/4" O.D. tubing for main

and branch male pneumatic connections.

Jumper Selection (CP-8552 Only)

Note:

The CP-8552 is factory calibr ated fo r the 4 to 20 mA and 0 to 10 V ranges. Switching

to the 6 to 9 V range requires recalibration of the start poi nt and span potentiometer s.

The CP-8552 has thr ee jum per sel ectabl e input ranges. Refer t o Figur e-4 for jumper block detail. Make proper jumper selection as follows:

1. Choose input range.

2. Consult Table-1 for jumper position.

3. Place jumper over square posts on appropriate lettered block (Figure-4 ).

4. Calibrate by performing appr opriate CHECKOUT procedure.

Table-1 CP-8552 Jumper Selecti on.

Range

4 to 20 mA X 6 to 9 V X 0 to 10 V

CP-8552 factory supplied at 0 to 10 V input.

Transducer

Start point

Zero adjust

potentiometer

x = Insert jumper at positi on shown in chart.

ABC

Span adjust

potentiometer

Wiring

terminations

1 2

Figure-4 CP-8552 Internal View.

Jumper

Square

post

block

Jumper

ABC

Controller Output Scaling

In order to properly control the actuator , t he output of the controller mu st be scaled appropriat ely. Table-2 below illustr ates the correct output whi ch corresponds to the electronic input of the transducer.

Table-2 Electronic/Pneumatic Transducer Conver sion Chart.

Electronic Input

Output

(PSI)

3 4.00 6.00 0.00 4 5.33 6.25 0.83 5 6.67 6.50 1.67 6 8.00 6.75 2.50 7 9.33 7.00 3.33 8 10.67 7.25 4.17

9 12.00 7.50 5.00 10 13.33 7.75 5.83 11 14.67 8.00 6.67 12 16.00 8.25 7.50 13 17.33 8.50 8.33 14 18.67 8.75 9.17 15 20.00 9.00 10.00

* Applies only to CP-8552.

4-20

6-9

Volts*

0-10

Volts*

CHECKOUT 4 to 20 mA Range

(CP-8551 and CP-8552)

Note:

The CP-8551 and CP-8552 4 to 20 mA span and start point potentiometers ar e not

field adjustable.

To check transducer operation:

1. Check for forei gn mat erial such as dirt or oil in the air supply . Also check f or clog ged fil ters. Supply air contamination by dirt or oil is the most likely cause of malfunction.

2. Verify that the unit is mounted upright and wired correctly.

3. Verify that 20 psig (138 kPa) main ai r is present.

4. Verify with a digital multimeter that a 4 to 20 mAdc signal is present and of correct polarity.

5. Adjust the input signal to 4 mA. Branc h pressure should be 3 psig ± 1.0 (21 kPa).

6. Adjust the input signal to 20 mA. Bran ch pressure (direct acti ng) should be 15 psig ± 1.0 (103 kPa).

7. Unit is functional i f correct press ures are indicated. Replace an inoperative transducer with a functional unit.

0 to 10 or 6 to 9 V Range (CP-8552 only)

MAINTENANCE

To check transducer operation:

1. Check for fo reign ma teria l such as dirt o r oil i n the a ir supp ly. Al so check for c logged f ilte rs. Supply air contamination by dirt or oil is the most likely cause of malfunction.

2. Verify that the unit is mounted upright and wired correctly.

3. Verify that 24 Vac power is available and 20 psig (138 kPa) main air is present.

4. Verify with a digital vol tmeter that an input sig nal between 0 to 10 or 6 to 9 V is present and of correct polarity.

5. Use a digital voltmeter to verify the presence of the correct power supply voltage between terminal s 1 and 2.

6. Adjust the input signal to bottom of range (0 or 6 V).

7. Branch pressure should be 3 psig (21 kPa). If not, adjust start point potentiometer (Figure-4 ) to obtain a 3 psig (21 kPa) output.

8. Adjust input to top of range (9 or 10 V).

9. Branch pressure should be 15 psig (103 kPa). If not, adjust SPAN potenti om eter (Figure-4 ) to obtain a 15 psig (103 kPa) output.

10. Recheck steps 6 through 9.

11. Unit is functional if cor rect pressures are indicated. Replace an inoperative t ransducer with a functional unit.

Regular maintenance of the total system is recom m ended to assure sustained optimum performance.

FIELD REPAIR

DIMENSIONAL DATA

4-5/8 (118)

(102)

5/16

(8)

Field repair is not recommended. Replace an inoper ati ve transducer with a functional unit.

4-1/4 (108)

1-21/32

1/2

(13)

(42)

1-3/32

(28)

2-5/32

(55)

2-1/4

(57)

2-13/16

(71)

2-3/4

(70)

9/16

(14)

Front View

Dimensions shown are in inches (mm).

Figure-5 CP-8551 and CP-8552 Dimens ions.

Side View

F-26159-5

TAC

1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940

www.tac.com

t.a.c. CP-8551, CP-8552 General Instructions Manual

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