Siemens EA 746 Series Spezifikationen PDF herunterladen (Seite 28)

POWERS™ Controls No. 4 Pneumatic Damper Actuator Technical Instructions

Document Number 155-032P25

October 10, 2005

Siemens Building Technologies, Inc. Page 9

Extended Shaft

Mounting - Fixed

Actuator

1. Order one of the following damper actuators, the clevis, and linkage kit (Figure 8):

Actuator with mounting bracket: 331-2911, 331-2966, 331-2927, or 331-2974

Clevis: 331-801

Linkage Kit: 331-958

2. Determine the application, and select appropriate "X" and "Y" dimensions from

Table 7. Select a rigid section of the duc

t, if possible, and then draw these lines on

the duct.

NOTE: If the "X" dimension is 8-1/2 inches (216 mm), place the rear of the

actuator against the damper shaft and draw a line along the front of the

bracket for the "X" dimension.

Measure the “Y” dimension.

3. If the actuator assembly mounts to the right of the damper shaft (Figure 8):

•

Draw the "Y" dimension line above the damper shaft if the damper blade is to

rotate CCW as actuator pressure increases.

• Draw the "Y" line below the damper shaft if the damper blade is to rotate CW as

actuator pressure increases.

If the actuator assembly mounts to the left of the damper shaft:

• Draw the "Y" dimension line above the shaft if the damper blade is to rotate CW

as actuator pressure increases.

• Draw the "Y" line below the damper shaft if the damper blade is to rotate CCW

as actuator pressure increases.

CAUTION:

It is important to use the "X" and "Y" dimensions in Table 7 to position the

actuator. They were selected to ensure that the crank is approximately

perpendicular to the actuator shaft at half its stroke. This will prevent the

linkage from scissoring or locking up (see Figure 7).

AP0254R1

CRANK

SHAFT

PIVOT

POST

MOUNTING

PLATE

PIVOT POST AND CRANK SHAFT

MUST REMAIN PERPENDICULAR

TO MOUNTING PLATE

Figure 7. Perpendicular Mounting.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33

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