SmartPAC 2 User Manual 1126700
Installation 2-11
Wintriss Controls Group stocks a spring-loaded base with a hole pattern that matches the hole
pattern on the resolver. The resolver can turn in a clockwise or counterclockwise direction.
You can change the direction of rotation by swapping the black and yellow wires on the
resolver connector (see Table 2-1, page 2-13).
When designing the drive for the resolver, make sure that the drive allows for adjustment of
the resolver to its zero position at top dead center. All sprockets must be keyed or pinned. The
resolver shaft has a standard key.
Design a method of driving the resolver directly from the crankshaft, using a chain or timing
belt (not a V belt) and sprockets. Use either an idler sprocket or spring-loaded resolver base to
compensate for slack or stretch.
Observe these additional precautions when designing the resolver drive:
• Do not use a long, sloppy chain. The distance between the center of the resolver shaft and
the center of the crankshaft should be no more than 3 feet (1 m).
• Do not use gears, right-angle joints, or shafts with universal joints because these will
develop too much backlash or too much play.
• Do not try direct-coupling to the crank because this requires extreme precision. If the
resolver is only slightly off-center, the resolver bearing will be subjected to side loads well
beyond its rated capacity and will ultimately fail.
• Do not use flexible couplings, which can be inaccurate, or V belts, which may slip and
cause inaccuracy.
• Do not use a flexible shaft like a speedometer cable. Because the shaft twists on start-up,
the resolver will lag the crank. When the crank stops, the resolver will turn past the true
stopping point and snap backward.
Mounting the Resolver
Once you have thought out your design and gathered the parts, mount the resolver as
described below. Don’t worry about which direction the resolver turns at this point. You will
adjust for the direction of rotation later when you wire the resolver.
1. Mount the resolver by bolting it to the press or other platform.
2. Install your drive mechanism.
3. Make sure the press is within ±5° of Top Dead Center (TDC).
4. Before attaching the chain or other drive mechanism, rotate the resolver shaft so that the
keyway is aligned with the arrow on the housing. See Figure 2-6.
DAMAGE TO RESOLVER
Be sure that the sprocket or gear driving the resolver chain or timing belt is mounted so that it is
centered on the crankshaft. If the gear or sprocket is mounted off-center, the resulting loads on
the resolver shaft may cause the resolver to fail.
Failure to comply with these instructions could result in property damage.
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