Honeywell Switch 272630D User Manual

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 .  
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  
 
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
 
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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