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SQS Electronic Valve Actuator, 24 Vac, 3-Position (Floating) Control, Fail-Safe
Operation
Mounting and
Installation
Wiring
Siemens Industry, Inc.
A 24 Vac control signal to Y1 extends the actuator shaft proportionately to the length of
time the signal is applied.
A 24 Vac control signal to Y2 retracts the actuator shaft proportionately to the length of
time the signal is applied.
In the event of a power failure, the SQS85.53U actuator returns the valve to its normal
(spring return) position.
Mount the actuator in any position except with the actuator lower than the valve.
Use earth ground isolating, step-down Class 2 power supplies. Do not use auto
transformers.
Determine supply transformer minimum rating by summing total equipment on circuit.
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 per actuator.)
WARNING:
Housing rated for flex conduit only.
Figure 1. Mounting Positions.
Technical Instructions
Document Number 155-308P25
March 17, 2015
Page 3
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