SIEMENS SAS81 Series Electronic Valve Actuators Instruction Manual
- June 9, 2024
- SIEMENS
Table of Contents
SAS81 Series Electronic Valve Actuators
Instruction Manual
Installation Instructions
Document No. 129-611
January 19, 2016
SAS81 Series Electronic Valve Actuators
Product Description
The SAS81 Series Actuators require a 24Vac or 24 Vdc supply and provide
floating (three-position) control for Power mite 599 MT Series terminal unit
valves with 7/32-inch (5.5 mm) stroke. In the SAS81.33U, a mechanical spring
returns the valve to its normal position when there is no power supply.
Product Numbers
SAS81.03U – Non-spring Return (Fail-in-place) actuator SAS81.33U – Spring
Return (Fail-safe) actuator
Estimated Installation Time
- 12 minutes for wiring a factory installed actuator
- 30 minutes for field replacement of actuator
Required Tools
- No. 2 Phillips or flat-blade screwdriver
- Flat-blade calibration screwdriver (3 mm) for wiring connections
- Wire cutter/stripper
Warning/Caution Notations
Warning| | Personal injury or loss of life may occur if you do not follow a
procedure as specified.
---|---|---
Caution| | Equipment damage may occur if you do not follow procedures as
specified.
Prerequisites
WARNINGS:
If mounting the actuator to a valve already in line, either close the shut-off
valves in the piping (upstream first, then downstream) or switch off the pump
to allow the differential pressure in the valve to drop. Disconnect the
controller power before replacing an actuator.
Mounting
Figure 1 shows acceptable actuator mounting positions for water applications.
The recommended mounting position of the actuator for low pressure steam
applications is between 45° and horizontal.
Installation
If you are mounting an actuator on a new valve, begin with the instructions, Mounting an Actuator to a Valve.
Remove Actuator from Valve
-
Remove actuator cover screws using either a
No. 2 Phillips or a No. 2 flat-blade screwdriver and detach actuator cover. -
Identify and disconnect wires.
-
Replace actuator cover. Use cover screws to secure actuator cover in place.
-
Loosen coupling piece.
-
Remove actuator from valve.
Mounting an Actuator to a Valve
- If you are attaching the actuator to a new valve, remove the protective plastic cap from the valve stem.
- On the SAS81.03U Actuator, turn the manual-positioning knob counterclockwise to its end point.
- Place the actuator on the valve.
- Hand-tighten the coupling piece.
- Use either a Phillips head screwdriver or a flat- blade screwdriver to remove the actuator cover for access to the terminal block.
- Attach wires. See Wiring and Start-Up.
- Place the cover on the actuator.
- Fasten the cover with the screws
Wiring
All wiring must conform to NEC and local codes and regulations
Use earth ground isolating, step-down Class 2 transformers.
Do not use auto transformers.
Determine supply transformer rating by adding up the total VA of all actuators
used.
The maximum rating for Class 2 step-down transformers is 100 VA
Do not power more than 10 actuators with one transformer.
(Use 0.5 amp fuse on secondary actuator.)
- Remove actuator cover screws using either a No. 2 Phillips or a No. 2 flat-blade screwdriver and detach actuator cover.
- Access terminal block and attach wires per Figure 2 through Figure 5.
- Replace actuator cover. Use cover screws to secure actuator cover in place.
CAUTIONS:
Terminals G and G0 must be properly wired for correct function and full life of the actuator.
If the actuator makes a buzzing noise upon reaching setpoint, G and G0 are improperly wired and should be reversed.
Start-Up
The valve body (normally open or normally closed) determines action of the
complete valve/actuator assembly.
Troubleshooting
- Check wiring for proper connections and secure attachments.
- Check for adequate power supply.
References
Power mite 599 MT Series SAS Electronic Valve Actuator, 24 Vic or 24 Vdc,
Floating Control (3-Position) Technical Instructions (155-681).
Dimensions
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. © 2016 Siemens Industry, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
USA
Tel. +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. 129-611
Printed in the USA
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