Honeywell 272630D User Manual

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272630D Position Feedback and

CAUTION

Auxiliary Switch Accessory

FOR ML6984 AND ML7984

INSTALLATION INSTRUCTIONS

APPLICATION

The 272630D auxiliary board is an optional circuit board that is used in conjunction with Series 4000 ML6984 and ML7984 globe valve actuators. This auxiliary board combines the function of an adjustable low voltage SPDT auxiliary switch with a 2-10 Vdc or 4-20 mA position feedback signal. It has a 4-pin keyed connector for communications from the mother circuit board.

SPECIFICATIONS

Feedback: 2-10 Vdc (10-2 V reverse acting) into mini-

mum impedance 500 ohm. Maximum output current is 20 mA dc.

Auxiliary Switch: SPDT, 24 V, 50/60Hz, 1 A inductive.

Fixed differential (3% of stroke), adjustable operating point from 0 to 100% of stroke.

INSTALLATION

When installing this product...

1. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazardous condition.

2. Check ratings given in instructions and on the product to ensure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

1. Disconnect power supply before beginning

installation to prevent electric shock and equipment damage.

2. All wiring must comply with applicable local

electrical codes, ordinances and regulations.

3. DO NOT electrically operate the ML6-7984 actuator before assembly to the valve because damage not apparent to the installer may occur. Mount the actuator to the valve before connecting to power.

Assembly

1. Remove plastic cover from the ML6-7984 by loos-

ening the two screws located on the top. (Note: These screws are captive. Rotate three complete revolutions to remove cover).

2. Slide the auxiliary board into the two slots at the bottom of the bridge. Push back and snap the board into the fingers. (See Fig. 1)

3. Connect one end of the 4-pin connector to the main board and the other end to the auxiliary board if it is not already connected. The connectors are keyed and only install one way.

4. Mount the actuator onto the valve body and connect wiring.

5. Reinstall cover after operational check.

95C-10941-02

272630D POSITION FEEDBACK AND AUXILIARY SWITCH ACCESSORY

The 272630D provides:

FINGERS

BRIDGE

1. INSTALL CIRCUIT BOARD

1. A 2-10 Vdc voltage proportional to the valve stem position. This output is capable of sourcing up to 20 mA dc drive current.

2. An isolated "Form C" relay contact closure that energizes when the valve is open more than the setting of the trimmer potentiometer ("trim pot").

SLOTS

M32264

Fig. 1. Installation of auxiliary board.

OPERATION

The first time the valve is powered, the microprocessor will automatically cycle the valve through a full stroke to calibrate its position. Any stroke between 1/2" (13 mm) and 1" (25 mm) will be divided into 30 equal steps. Run time will be proportional to stroke length. (For example: nominal timing for 3/4" stroke is 63 seconds. For 1/2" stroke this would be 42 seconds). The LED lights up when terminals T5-T6 are powered, and flash when the actuator is in motion.

NOTE: 272630D requires that the actuator be continu-

ously powered, so ML6984 must be wired in "5wire" configuration.

RLY1

C-NO CONTACT CLOSED WHEN VALVE POSITION IS ABOVE TRIM POT SETTING (DIRECT ACTING).

CNO

TRIM POT

LED

2-10 V, (4-20 MA INTO 500 Ω) FEEDBACK OUTPUT COM

+FB

-COM

C-NC CONTACT CLOSED WHEN VALVE POSITION IS BELOW TRIM POT SETTING (DIRECT

CTING).

Position feedback voltage mirrors the control signal. For ML6984 and direct acting ML7984 operation, see Fig. 3. For reverse acting ML7984, see Fig. 4.

STROKE

UPPER SEAT

LOWER SEAT

Fig. 3. Feedback voltage response for ML6984 and

UPPER SEAT

LOWER SEAT

FIRST AND LAST STEPS ARE @ 0.75V PER STEP

FEEDBACK VOLTAGE

2.5V 9.5V 10.25V

1.75V

direct acting ML7984.

STROKE

FIRST AND LAST STEPS ARE @ 0.75V PER STEP

28 STEPS @

0.25V PER STEP

FEEDBACK VOLTAGE

2.5V

1.75V

28 STEPS @

0.25V PER STEP

9.5V

10.25V

M32267

M32266

Fig. 2. Wiring and operation of auxiliary board

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Toronto, Ontario M1V 4Z9

customer.honeywell.com

272630D.

CONNECT TO MAIN BOARD FOR POSITION FEEDBACK.

M32265

Fig. 4. Feedback voltage response for reverse acting

ML7984.

Auxiliary Switch Setup

1. Drive actuator to desired position.

2. Adjust trimmer potentiometer ("trim pot") until relay

is energized. (On-board LED will light).