NorthStar RIM Tach
®
8500 & 8500 Quad Instruction Manual
15
Dynapar (800) 873-8731 November 2008
Caution must be used when handling the pulse wheel assembly. The surface of the pulse wheel outer rim is
sensitive to scratches and impacts. The magnetic properties of the pulse wheel material can also be distorted or
erased by exposure to strong magnetic fields.
Remove pulse wheel assembly from packaging.
Leave protective red rubber band in place over pulse wheel.
Place assembly over the end of the shaft. The wheel side with the two set screws should be toward the outside, away from
motor.
Be sure the set screws in the adapter are retracted so that they will not
interfere with the shaft while mounting the unit.
Slide assembly on the shaft until there is about a 1 inch gap left between inner face of pulse wheel and motor facing. It may be
necessary to lightly tap the assembly to get it all the way on. The 1 inch gap is not a critical measurement.
Insert four ½-12 mounting studs so that the inside threaded portion is completely threaded into the motor frame. This will set
the mounting stud to the correct length. Torque the mounting studs to a nominal 60 ft-lbs. The mounting studs support the
weight of the enclosure during installation, permit better alignment to the motor, and prevent the Pulse Wheel from being
damaged.
Remove enclosure from packaging.
Determine which of two orientations of enclosure is best for this application (Sensor Modules horizontal or vertical).
Ensure that one of two drain holes is at bottom of enclosure. If not,
rotate the unit 180°.
Place enclosure on rods and slide on to motor facing. Tap lightly with hand or hammer if needed to start enclosure to slide
over motor facing. Make sure clearance holes remain aligned.
If the pulse wheel is not lined up and
no pre-drilled holes
are required, use the following procedure to adjust the position of
the pulse wheel.
Slide the pulse wheel assembly until the alignment surface of the unit is even with the recess in the face of the enclosure.
Use a straight edge to check it. The alignment surface and recess of the enclosure should be aligned to within ±0.010”.
See figure 8.
Tighten two set screws to a nominal 15 inch-pounds.
If the pulse wheel is not lined up and
pre-drilled holes
are desired, use the following optional procedure to locate (or
relocate) set screw holes in shaft.
Leaving one of the set screws tightened, remove other set screw and use a punch to mark position of set screw hole on
shaft.
Replace and tighten set screw. Remove other set screw and use a punch to mark position of that set screw hole on shaft.
Remove enclosure and pulse wheel.
Use standard ¼” bit to drill a hole that is approximately 0.1” deep from the tangent point of shaft (point of first contact of
drill to shaft) to bottom of hole. Do this for both holes.
Slide pulse wheel back onto motor shaft.
Slide the enclosure back onto four ½-12 mounting studs reseating enclosure to the 8 ½” C-Face.
Slide the pulse wheel assembly until the alignment surface of the unit is even with the recess in the face of the enclosure.
Use a straight edge to check it. The alignment surface and recess of the enclosure should be aligned to within ±0.010”.
See figure 8.
Tighten two set screws to a nominal 15 inch-pounds.
