272630D
Position Feedback and
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 minimum impedance 500 Ω.
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.
2005.04 RJ Printed in Canada
Form No. 95C-10941
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The 272630D provides:
1. A2-10 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").
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
First and last steps
are @ 0.75V per step
28 steps @
0.25V per step
LOWER
SEAT
FEEDBACK VOLTAGE
1.75V
2.5V
9.5V
10.25V
Fig. 3 - Feedback voltage reponse for
ML6984 and direct acting ML7984
STROKE
UPPER
SEAT
First and last steps
are @ 0.75V per step
28 steps @
0.25V per step
LOWER
SEAT
FEEDBACK VOLTAGE
1.75V
2.5V
9.5V
10.25V
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).
3
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Automatic and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN
55422
Honeywell Limited-Honeywell Limitee
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
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