Owner's manual

(e)
0
(9)
25
2.5
27
28
Add answer from step 2 to
value marked 2.
Press power function key (y’).
Enter 0.5 into calculator.
The value in step 27 is equal to
length of connecting liige
“P “.
Design linkage system by “sing values
for lengths of drive and driven levers,
angtdar position of both levers frm”
vmtical (offsets), and distance between
drive and driven levers centers to
calculate length of liige.
Close dmnper to minimum flow
position. Make sure driven lever is at
angle (PJ and drive lever is at angle
0%).
Cut liige pipe to length (p) allowing
for both clevises. Attach clevises and
install linkage between operating
1eJWs.
Check for freedom of movement by
operating power positioner’s manual
lever. Make minor adjustments to
linkage length by turning pipe to clevis
fitting in or out as necessary.
2. Characterized Power Positioner.
(a)
(b)
Measure full @avel of device being
controlled from full open to full closed.
Record maximum and minimum
positions.
Install Linear Linkage.
1 Measure length of driven lever
(R,) on device to be controlled
(Figure 2-9).
2. Attach cl&s to drive lever so
that distance R, is equal to R,.
3 Close damper of device being
controlled to minimum flow
position.
Figure 2-9. Linear Linkage Design
Measure angle (0,) of device’s
driven lever from vertical center
Sine.
Install power positioner’s drive
lever so its angle from vertical
center line (03 is equal to
device’s driven lever angle (0,).
Measure distance Q between
drive and driven levers
connection holes. Allowing for
clevis length, cut pipe to fit this
measurement. Attach clevises.
Install liige pipe between drive
and driven levers. Check for
freedom of movement by
operating power positioner’s
manual lever. Make minor
adjustments to linkage length by
turning linkage clevis fitting in or
0”t as necessary.