Installation Instructions
Document No. 129-229
September 29, 2009
ASC9.3…U Dual Auxiliary Switches
Product Description
This package contains a dual auxiliary switch and a
black NEC Class I compliant wiring compartment
cover for use on the SKB/C/D8... three-position valve
actuators.
Product Numbers
ASC9.3BCU
ASC9.3DU
Warning/Caution Notations
Personal injury/loss of life may
occur if a procedure is not
performed as specified.
Equipment damage, or loss of
data may occur if the user
does not follow procedure as
specified.
WARNING
CAUTION
Figure 1. Step 4.
Prerequisites
WARNING:
Disconnect power supply to the
actuator before beginning to install
the switch.
Required Tools

1/8” and 1/4” flat blade screwdrivers

Phillips screwdriver
Instructions
1. Use a 1/4” flat blade screwdriver to remove the
actuator cover.
Figure 2. Step 5.
2. Remove the upper conduit opening knock-out.
See Figure 1.
3. Feed the wires through the conduit. Attach the
flexible conduit to the actuator.
Item Number 129-229, Rev. 300
Page 1 of 3
Document No. 129-229
Installation Instructions
September 29, 2009
Wiring
Attach the wires to the terminals.
G
3
4
C1
5
3
4
C2
Y1 Y2 21
5
Figure 6. Wiring Diagram.
Switch Adjustment
EA0419R2
1. Connect the valve stem to the actuator.
NOTE:
Figure 3. Step 6.
2. Preferably, make the electrical connections to the
actuator.
Make sure the barrier is in place.
3. Move the actuator either electrically (preferably) or
mechanically to the desired stroke position.
4. With a flat blade screwdriver turn the switch cam
until an audible click indicates the switch is
actuated. See Figure 7.
5. Repeat steps 3 and 4 for setting the c2 switch
cam. See Figure 7.
c1 Switch Cam
3
4
C1
5
3
4
C2
5
EA0418R1
Figure 4. Step 7.
c2 Switch Cam
3
4
C1
5
3
4
C2
5
Figure 5. Step 8.
Figure 7. Adjusting the Switches.
Siemens Industry, Inc.
Page 2 of 3
Document No. 129-229
Installation Instructions
September 29, 2009
Replacing the Cover
References
Technical Instructions
EA 599-2 SKB/C 3-position Actuator
Document
Number
155-171P25
EA 599-5 SKD 3-position Actuator
155-181P25
Installation Instructions
SKB/C…
129-185
SKD…
129-217
Figure 8. Attaching the cover.
Use a Phillips or 1/4” flat blade screwdriver to tighten
the black cover onto the actuator.
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and
models as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective
owners. © 2009 Siemens Industry, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
+ 1 847-215-1000
Your feedback is important to us. If you have
comments about this document, please send them to
sbt_technical.editor.us.sbt@siemens.com
Document No. 129-229
Printed in the USA
Page 3 of 3