Owner's manual

2 Enter value of BP
s Press sine key (SIN).
,lJ Divide answer from step JQ by
2.0.
12 Press square key (usually key
marked x3.
13 Write down answer from step 12
and label it B.
E Enter vahx. marked 5 and
subtract value marked u.
& The value in step s is equal to
ve.rticd distance travelkd by
drive lever “Y”.
(c) Figure out angular rotation of driven
lever. This is done in terms of drive
lever rotation. The angular rotation
follows Figure 2-7 and the relationship:
NOTE
The following known values are used to
calculate the total angular rotation of the
driven lever; C&.
Or = Total angular rotation of the drive
lever. If power positioner is at full
stroke, this measurement is 80’.
R, = Length of the drive lever (from shaft
center to clevis pia center) measured
in inches.
Q = Length of the driven lever (from
shaft center to clevis pin center)
measured in inches.
PI = Angular measurement of drive lever
from vertical centerline with piston
fully extended.
!.3* = Angular measurement ofdriven lever
from vertical centerline with damper
fully closed.
POWER
PoSITloNER
I I Pcc.x?
Figure 2-7. Driven Shaft Angular Rotation
To perform the following prcccdurc, a
calculator with basic functions, plus the
following
scientific functions, is
necessary:
-Sine Function (SIN)
-Inverse Sine Function (SIN“) or (INV
SW
-Square Function (x”)
-Power Function (y”)
Use the following procedure to
de&mine @, the angular rotation of
the driven lever.
1. Add value of !3, to value of 8,.
2 Enter answer from step 1. and
press sine key (SIN).
3 Divide answer from step 2 by
2.0.
4 Multiply answer from step 3 by
length of driven lever (FQ.
IB-IM-204
2.7