LINK Systems System 2500 PLS - Manual (Page 60)

System 2500 Operating & Installation Manual - Revision 07 4-2
Figure 21
Operator Interface Terminal
Mounting Dimensions
speed shafts other then the crankshaft. However, the resolver must be driven by the high speed
shaft in the inverse ratio by which the shaft motion is related to the crankshaft (that is if the high
speed shaft turns in a 3:1 ratio to the crank, the resolver must turn in a 1:3 ratio to the high speed
shaft.) Coupling of the resolver to the crankshaft is usually accomplished by a chain drive.
The mounting dimensions of the resolver are illustrated in Figure 23. The shaft of the resolver is
3/4" diameter with a 3/16" wide keyway. The sprocket attached to the resolver must be bored
and keyed to fit. Do not install the sprocket without a proper size key.
The other sprocket must be attached to the machine shaft. The proper size hole must be drilled
and tapped in the machine shaft. This hole must be in the static center of the machine shaft.
After the sprocket has been attached to the machine shaft, a additional hole should be drilled.
The hole should be approximately 3/4" off of static center. The hole should be drilled through
the sprocket and into the machine shaft. The sprocket should be removed. The off center hole in
the machine shaft should be tapped for a 1/4" bolt or larger. The off center hole in the sprocket
should be drilled for clearance of the off center screw. Attach the sprocket to the machine shaft
with the center bolt and the off center bolt.
When attaching the chain to the sprockets, the zero position of the resolver must be aligned with
the top dead center of the machine shaft. The zero position of the resolver is indicated by the
legend on the front of the resolver assembly. When the keyway is aligned with the zero position