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272630D POSITION FEEDBACK AND AUXILIARY SWITCH ACCESSORY
FINGERS
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 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 "5-
wire" configuration.
C-NC CONTACT
C-NO CONTACT
CLOSED
CLOSED
WHEN VALVE
WHEN VALVE
POSITION IS
POSITION IS
BELOW TRIM POT
ABOVE TRIM
POT SETTING
SETTING (DIRECT
ACTING).
(DIRECT ACTING).
C NO
NC
RLY1
Fig. 2. Wiring and operation of auxiliary board
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
BRIDGE
1. INSTALL
CIRCUIT
BOARD
M32264
2-10 V,
(4-20 MA
INTO
500 Ω)
FEEDBACK
OUTPUT
COM
+FB
-COM
J1
CONNECT TO MAIN
BOARD FOR POSITION
FEEDBACK.
M32265
272630D.
The 272630D provides:
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").
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
1.75V
Fig. 3. Feedback voltage response for ML6984 and
STROKE
UPPER
SEAT
LOWER
SEAT
1.75V
Fig. 4. Feedback voltage response for reverse acting
Auxiliary Switch Setup
1. Drive actuator to desired position.
2. Adjust trimmer potentiometer ("trim pot") until relay
is energized. (On-board LED will light).
® U.S. Registered Trademark
© 2010 Honeywell International Inc.
95C-10941EFS—01 T.D. Rev. 10-10
Printed in U.S.A.
FIRST AND LAST STEPS
ARE @ 0.75V PER STEP
28 STEPS @
0.25V PER STEP
FEEDBACK VOLTAGE
2.5V
9.5V
direct acting ML7984.
FIRST AND LAST STEPS
ARE @ 0.75V PER STEP
28 STEPS @
0.25V PER STEP
FEEDBACK VOLTAGE
2.5V
9.5V
ML7984.
10.25V
M32266
10.25V
M32267
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