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Design Features:
- Low profile assembled height
- Bearing design
simplifies encoder attachment
- Resolutions up to
1250 lines per revolution
- 4, 6 or 8 pole commutation
- Multiple Bolt Circle mounting
- Through shaft sizes up to
0.375” (10mm) Diameter
- High Noise Immunity
- Cost Competitive with Modular Encoders
- 500 kHz Frequency
Response · RoHS Construction
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Description:
Quantum Devices, Inc. Model SC12 provides an improved feedback
solution in applications typically using modular encoders. With
an over all height of less than one inch and the stability of
a bearing encoder design, the model SC12 can provide significant
performance upgrades in applications limited by traditional modular
encoder solutions. SC-12 Outputs consist of a quadrature sine/cosine
pair with an index pulse and three-phase commutation. Each SC-12
is individually calibrated to compensate for normal construction
variances. This creates high quality Sin/Cosine outputs that
allow for large Count-per-Revolution interpolation factors which
are configurable in most of today’s sin/cosine drives.
Output levels are also stabilized due to source tracking of the
sensor supply allowing for compensation of any temperature variation,
and aging effects. Differential style outputs provide greater
noise immunity and signal integrity. All Outputs are Short-circuit-proof
and reverse polarity tolerant. A flexible member allows for much
greater tail shaft run out and TIR than can be tolerated by modular
encoder designs, plus it provides 30 degrees of rotation for
commutation timing.
Ordering Information
Sample: SC12-1000-4-A-B-L-C-A
| Model |
PPR |
Poles |
Electrical |
Hub Configuration |
Hub Size |
Mounting |
Index |
| SC12 |
256
360
500
512
1000
1024
1250
|
0=0
4=4
6=6
8=8 |
| A= |
Sine/Cosine & RS422 (TTL) UVW |
| B= |
Sine/Cosine & OC UVW |
|
| B= |
Bottom Mount Hub with Hole in Cover |
| C= |
Bottom Mount Hub with NO Hole in Cover |
|
C=5mm
D=6mm
E=8mm
F=10mm
L=.25"
M=.3125"
N=.375" |
A=SS 1.812" Flex
B=SS 1.575" Flex
C=SS 1.280" Flex |
A=Ungated Square
Wave
B=Ungated Sinusoidal
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Consult Factory For Configurations Not Shown
Electrical Specifications
| Input Voltage |
5 VDC ± 5% |
| Input Current Requirements |
65mA Typ., 100mA Max Plus Interface Loads |
| Input Ripple |
2% Peak to Peak @ 5 VDC |
| Output Circuits |
(A) Sine/Cosine, Index & RS422
UVW (TTL Compatible)
(B) Sine/Cosine, Index & UVW Open
Collector |
| Incremental Output Format |
Quadrature Sine/ Cosine with A leading
B for CW rotation. Ungated Index Pulse. |
| Frequency Response |
500 kHz |
| Sine/Cosine & Index
Amplitude |
1 Vpp ± 5% (Measured Differentially) |
| Commutation Format |
Three Phase 4, 6 or 8 poles |
| Commutation Accuracy |
± 1° mechanical |
| Z channel to U channel |
± 1° mechanical |
Environmental Specifications
| Storage Temperature |
-40 to 125° C |
| Operating Temperature |
-20 to 115° C |
| IP Rating |
40 |
| Humidity |
90% Non-Condensing |
| Vibration |
20 g's @ 50 to 500 CPS |
| Shock |
50 g's @ 11mS Duration |
Mechanical Specifications
| Through Shaft Diameter |
0.250", 0.3125", 0.375", 5mm
6mm ,8mm, 10mm
Tolerance: -0.0000, + 0.0006” |
| Recommended Shaft Engagement |
.50” Minimum |
| Radial Shaft Movement |
0.007" TIR |
| Axial Shaft Movement |
± 0.030" |
| Maximum Shaft Speed |
8000 RPM, Contact Customer Service
for Higher RPM |
| Interface Connector |
Connector: JAE P/N F1-W15P-HFE |
| Mounting |
1.28”, 1.575”, 1.812” Bolt
Circle |
| Moment of Inertia |
9.1 x 10-5 oz-in-S2 |
| Acceleration |
1x105 Radians/S2 |
| Accuracy |
Instrument Error 1.5 arc min. max |
Output Waveforms
SIZE 15 RESOLVER MOUNTS
Utilize the optional resolver mount adapters
to mate the SC12 - 1.280” Flex mount option to Size 15 Pancake
Resolver motor configurations. Eliminate the expensive mounting
servo clamps by attaching either the two or three point adapters
directly to the servo clamp holes. Assemble the SC12 to the adapter
plate using (2) 4-40 screws. For jam nut attachment to threaded
motor shafts, refer to JR12 Jam Nut Mount Optical Encoder Literature.
ENCODER INSTALLTION INSTRUCTIONS
- Using two fingers slide the encoder onto shaft.
- For additional
security, Loctite can be applied to the encoder hub set screws.
Remove the encoder’s set screws and using tip of toothpick
apply appropriate amount of Loctite thread locking adhesive.
A nonpermanent adhesive is recommended.
- Insert and tighten
encoder set screws using a .050” hex wrench. Typical torque
range of 50 to 80 oz-in.
- Fixture the stainless steel flex
mount to the mounting surface with #6-32 button head screws.
For brushless motors requiring commutation timing:
- Encoder drawings indicate position of encoder hub to encoder
body at Z (index). Rotating the hub to this position allows for
known U channel transition state (prior to step one above).
- Powering
appropriate motor windings allow for locking motor shaft location
to match the appropriate U transition (prior to step one above).
- While mechanically back driving the motor, monitor motor winding
EMF position to the powered encoder position. Rotate the encoder
stainless steel flex mount to achieve accurate timing of encoder
commutation feedback channels to the appropriate motor winding
EMF. Tighten the screws retaining the encoder stainless steel
flex mounts.
Additional installation and handling instruction available at:
www.quantumdev.com/pdf/EncoderMountingInstr.pdf
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