Schneider Electric SRD991 User Manual
Quick Guide 10.2015 QG EVE0105 B-(en)
SRD991 Intelligent Positioner
These instructions are to be used as a guide for quick start-up. For more detailed information, please refer
to the standard documents “Master Instructions” and “Product Specification Sheet”. These can be found
on our Website.
1. MOUNTING TO ACTUATORS
During operation, the flat side of the spindle 9 on the back of the positioner must always point towards
the arrow 26. The working angle around this position is ±45º.
2 6
2 6
9
9
Any mechanical backlash may be source of poor control, oscillation and hunting as well as long duration of
Autostart. Please use only original mounting parts and ensure that they are correctly mounted and tighten.
By not using the original feedback lever or by using them in an inappropriate way, the performance of the
positioner may be compromised.
MOUNTING TO LINEAR ACTUATORS
NAMUR Mounting - left hand -
NAMUR Mounting - right hand -
2 SRD991 QG EVE0105 B-(en)
MOUNTING TO LINEAR ACTUATORS (cont’d)
Feedback lever for linear actuators :
The carrier bolt B is in the slot of the feedback
lever A and the compensating spring F touches
the carrier bolt.
AB F
Carrier bolt B:
1 threaded sleeve 2 Stud 3 coupling piece
1 2 3
M 6
MOUNTING TO ROTARY ACTUATORS
• Do not tighten grub screw 4 against the thread
of spindle 9 ! (see next page).
• When in use the flat side of the spindle 9 must
move ( 0 ↔ 100%) in front of the arrow 26.
Direct Mounting
• When the product temperature rises, the drive
shaft 1 increases in length. Therefore, the rotary
adapter 3 must be mounted so that approx. 1
mm (0.04 in.) of clearance results between the
drive shaft 1 and the rotary adapter 3. This is
achieved by placing an appropriate number of
washers 5 on the feedback spindle 9 before
attaching the rotary adapter. Two washers
should result in a clearance of 1 mm.
> 1
> 1
QG EVE0105 B-(en) SRD991 3
Actuator, left turning Actuator, right turning
9
5
4
3
2
1
2. CONNECTIONS
Check before mounting fittings and cable glands
that the threads are matching; otherwise the
housing can be damaged. The letter “G” on the
housing marks where the pneumatic connections
are in G 1/4 (otherwise NPT).
Ground
Connect earth cable to screw #1 (or screw #2 in
the electrical connection compartment).
9
5
4
3
2
1
# 1 # 2
" G "
PNEUMATIC CONNECTIONS
WARNING
To avoid any personal injury resulting from bursting of parts, do not exceed maximum supply pressure of
positioner and actuator. To avoid any personal injury or property damage from sudden or fast movement,
during air connection: Do not put your finger or other part at any time inside the valve or in any
moving part of the actuator or in the feedback lever mechanism. Do not touch the rear part of the
positioner at any time. Connect air supply only after connections y1 (and y2 for double acting) are done.
Air supply (s): 1.4 to 6 bar (but not more than the max. pressure of actuator), free of oil, dust and water
( - - )
s
( - - )
y 1
( - - )
( - - )
s
y 1
( - - )
!
Single acting, Direct mounting Single acting Double acting
s supply y1, y2 pneumatic outputs (--) closed
y 2
s
y 1
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