Honeywell 272630D User Manual

Position Feedback and

Auxiliary Switch Accessory

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 minimum impedance 500 Ω.
Maximum output current is
20 mA dc.

272630D

For ML6984 and ML7984

INSTALLATION INSTRUCTIONS

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

2005.04 RJ Printed in Canada Form No. 95C-10941

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

272630D Auxiliary Board

INSTALLATION

Fingers Bridge

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 in complete, check out
product operation as provided in these
instructions.

!

CAUTION:

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 loosening 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.

1. Install
circuit
board

Slots

Fig. 1 - Installation of auxiliary board

OPERATION

The first time the valve is powered, the
microprocessor will automatically cycle the
valve through a full stoke 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
continuously powered, so ML6984 must be
wired in "5-wire" configuration.

C-NC contact
CLOSED
when valve
position is
below trim pot
setting (direct
acting).

RLY1

C-NO contact
CLOSED
when valve
position is
above trim pot
setting (direct
acting).

Trim pot

LED

2-10 V,
(4-20 mA
into
500 Ω)
feedback
output COM

+FBNC C NO

-COM

J1

Connect to main
board for position
feedback.

Fig. 2 - Wiring and operation of auxiliary

board 272630D

2