User manual

Chapter 1 Introduction
7
20 Gear Drive, Plymouth Ind. Park, Terryville, CT 06786
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AMCI Compatible Transducers
Table 1.2 lists the AMCI transducers compatible with the 1761H module.
Model Shaft Mount Turns Comments
HTT-20-100 0.625" Front 100 NEMA 13 heavy duty transducer
HTT-20-180 0.625" Front 180 NEMA 13 heavy duty transducer
HTT-20-1000 0.625" Front 1,000
HTT-20-100 w/ additional 10:1 gearing on input
shaft.
HTT-20-1800 0.625" Front 1,800
HTT-20-180 w/ additional 10:1 gearing on input
shaft.
HTT425-Ann-100† 0.250" Motor 100
A-B Series 1326 motor mount transducer.
“nn” in part number defines connector style.
HTT425-Mnn-100† 10 mm Motor 100
Universal motor mount. Requires adapter plate.
“nn” in part number defines connector style.
HTT425-Fnn-100† 0.625" Front 100 NEMA 4X, HTT-20-100 w/ Viton
®
shaft seal.
“nn” in part number defines connector style.
HTT425-Tnn-100† 0.625" Foot 100 NEMA 4X, HTT-20-100 w/ Viton shaft seal.
“nn” in part number defines connector style.
HTT400-180 0.625" Front 180 NEMA 4, HTT-20-180. Bolt–in replacement for
Autotech RL210 transducers.
HTTCR-9n-100 0.047"
Cable
Foot 540" Cable Reel Transducer, 540" span, 0.003" max.
resolution, 45 ft stranded stainless cable standard.
† A 1,000 turn version is also available.
Table 1.1 Compatible AMCI Transducers
Each transducer contains two resolvers. The first resolver, called the fine resolver, is attached
directly to the input shaft with a flexible coupler. The second resolver, called the course resolver,
is geared to the fine. This gear ratio, either 99:100 or 179:180 determines the total number of
turns the transducer can encode.
At the mechanical zero of the transducer the electrical zeros of the two resolvers are aligned.
See Figure 1.4A. After one complete rotation, the zero of the course resolver lags behind the
zero of the fine by one tooth, either 1/100 or 1/180 of a turn. After two rotations the lag is 2/100
or 2/180. See Figures 1.4B and 1.4C. After 100 or 180 turns, the electrical zeros of the resolvers
are realigned and the multi-turn cycle begins again.
The fine resolver yields the absolute position within the turn directly. Using a proprietary
algorithm, the module determines the number of turns completed by the difference in positions
of the two resolvers. The absolute Multi-turn position is then calculated as ((number of turns
completed * counts per turn) + fine resolver position).
The 1,000 and 1,800 turn transducers have a 10:1 gear ratio between the input shaft and the
resolvers. Therefore they can encode ten times the number of turns but at a tenth of the resolution.
FINE
0
0
COURSE FINE
0
0
COURSE FINE
0
0
COURSE
A
Mechanical Zero
B
After One Turn
C
After Two Turns
Figure 1.4 Resolver Alignment in Multi-turn Transducers