SSD81.5U Siemens Actuator

Datasheet

Installation Guide

Pressure Independent Control Series SSD Electronic Valve Actuators require a 24 Vac power supply and receive a floating control signal (SSD81…) or a proportional 0 to 10 Vdc signal (SSD61…) to control a valve. The 0 to 10V SSD61U actuator also accepts a 24 Vdc power supply.

These actuators are designed to work with 1/2- to 1-1/4-inch Pressure Independent Control Series Valves with a 1/10-inch (2.5 mm), 1/5-inch (5 mm), or 7/32-inch (5.5 mm) stroke and a threaded valve bonnet that fits the actuator.

Features:

• Nominal force >56 lbs (250 N)
• Automatic stroke calibration on the SSD61…
• UL listed for plenum installation
• Reduced power consumption in holding position
• Direct coupled installation without tools (hand-tightened)
• Manual override
• Visual position indication

For the SSD81.5U, a 24 Vac control signal to terminal Y1 extends the actuator shaft proportionately to the length of time the signal is applied.

A 24 Vac control signal to terminal Y2 retracts the actuator shaft proportionately to the length of time the signal is applied.

In the event of a power failure, the SSDx1.5U returns to the stem up, or normal position. The SSDx1.5U includes an electronic return mechanism that functions as follows. See Figure 4.