I
NSTALLING
THE
NX2A4E2
NX2A4E2 User Manual
ADVANCED MICRO CONTROLS INC.
36
1.6 AMCI Transducers
1.6.1 Transducer Outline Drawings
The NX2A4E2 is compatible with every standard single and dual resolver transducer manufactured by AMCI
as well as our R11 and R15 resolver transmitters. Outline drawings and specification sheets are available on
our website at:
.
1.6.2 Mounting
All AMCI resolver transducers are designed for industrial environments and therefore require little attention.
The resolver is electrically isolated from the body of the transducer to eliminate the potential for ground loops
and ground shifts in the system. The main guideline to follow when mounting the transducers is to limit bear-
ing loads when coupling the transducer to your machine. This includes using flexible couplers when directly
coupling shafts to eliminate shaft misalignments.
The following bearing load ratings are known as “L
10
ratings” in the bearing trade associations. L
10
is a stati-
cal rating meaning that 90% of the bearings will survive the specified number of revolutions. AMCI specifies
our rated number of revolutions as 2X10
9
, or 2 billion, which is a number commonly used in the industry. By
specifying the maximum load and statical life, AMCI gives you data you need to choose the right transducer
for your application.
Note that these load ratings are maximums, and you should always strive to keep shaft loading to a minimum.
The inverse relationship between shaft loading and bearing life is not linear, it's exponential.
This means that decreasing the shaft loading by half will, statically, increase the bearing life by a factor of
eight. For example, decreasing a shaft load from 100 lbs. to 50 lbs. yields: [100/50]
3
= 8 times increase in sta-
tistical bearing life.
At the loads specified below, bearing life is a minimum of 2x10
9
revolutions. Note that the R11 series and
HT-6 transducers always require a flexible coupler to your machine because of their shaft size.
Table T1.1 Shaft Load Specifications
Shaft Dia.
Maximum
Radial Load
Maximum
Axial Load
R11 Series
0.120"
2.0 lbs. (8.9N)
1.0 lb. (4.4N)
0.188"
6.0 lbs. (26.7N)
3.0 lbs. (13.3N)
HT-6
0.188"
6.0 lbs. (26.7N)
3.0 lbs. (13.3N)
H25 Series
0.250"
40 lbs. (178N)
20 lbs. (89N)
10 mm
40 lbs. (178N)
20 lbs. (89N)
0.375"
40 lbs. (178N)
20 lbs. (89N)
0.625"
100 lbs. (445N)
50 lbs. (222N)
HT Series
0.375"
100 lbs. (445N)
50 lbs. (222N)
0.625"
100 lbs. (445N)
50 lbs. (222N)
HTT Series
0.375"
100 lbs. (445N)
50 lbs. (222N)
0.625"
100 lbs. (445N)
50 lbs. (222N)
1
x
---
3
where
x
new shaft load
old shaft load
-----------------------------------
old shaft load
new shaft load
-----------------------------------
3
=
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