Quantum Devices, Inc. Model QDH20 provides an improved feedback solution in applications typically using a standard size 20 package. The QDH20 provides encoder feedback in standard industrial mounting configurations with superb mechanical and environmental protection. Outputs consist of a quadrature A & B with reference pulse Z as a standard feature. The output can be configured with either the 5 to 26 volt OL7272 line driver or open collector outputs. The QDH20 features two heavy-duty bearings holding the output shaft, and two more bearings along with an integral flexible spring mount to isolate the working pieces of the encoder from mechanical stresses.
| Input Voltage | 4.75 to 26 VDC |
|---|---|
| Input Current Requirements | 70mA typical @ 5 VDC plus interface loads |
| Input Ripple | 2% peak to peak @ 5 VDC |
| Output Circuits | OL7272 high voltage line driver: VOL = 0.5 V max @ 20 mA sink VOH = Vcc-0.8 V @ 20 mA source RS-422 compatible @ 20 mA source |
| Open Collector Output | Sink up to 100 mA |
| Incremental Output Format | Quadrature outputs with index pulse See waveform reference chart in spec sheet for timing and gating options |
| Accuracy | ±1.0 arc minute |
| Max Operating Frequency | 500 kHz |
| Symmetry | 180° electrical ± 10% typical |
| Minimum Edge Separation | 67° electrical at 100 kHz |
| Code | Incremental |
| Rise Time | Less than 1 µs |
| Electrical Protection | Reverse protected to 0.6 A cont., 4 A for 1µs OL7272 outputs over voltage and short circuit protected |
| Storage Temperature | -40 to 125°C |
|---|---|
| Operating Temperature | -20 to 100°C typical |
| Humidity | 98% non-condensing |
| Vibration | 20 g's @ 50 to 500 CPS |
| Shock | 50 g's @ 11 ms duration |
| IP Rating | IP66 solid shaft, IP64 blind bore |
| Maximum Shaft Speed | 8000 RPM |
|---|---|
| Blind Bore Diameter (Tolerance) | 0.375", 0.500", 0.625" (+0.0006/-0.0000") |
| Solid Shaft Diameter (Tolerance) | 0.250", 0.375", 10 mm (+0.0000"/-0.0004") |
| Allowable Shaft Runout | 0.001" TIR |
| Bearings | Precision ABEC double shielded |
| Shaft Material | 303 stainless Steel |
| Bearing Life | 1.5 X 10⁹ at rated load |
| Moment of Inertia | 3.4 X 10⁻⁴ oz·in·s² |
| Acceleration | 1 X 10⁵ radians/s² |
| Starting Torque | 1.0 in·oz max |
| Radial Shaft Loading | 40 lb for rated bearing life, 80 lb max |
| Axial Shaft Loading | 40 lb for rated bearing life, 80 lb max |
| Housing | Anodized aluminum |
| Weight | 13 oz typical |
| Termination | Radial Exit: 10, 7 & 6 pin MS, wire gland w/ 24" Cable Axial Exit: 10, 7 & 6 pin MS, wire gland w/ 24" Cable |
| Mounting | Flange w/ 1.181" female pilot Flange w/ 1.250" male pilot Servo w/ 1.181" female pilot Servo w/ 1.250" male pilot Size 25 flange and pilot Size 25 servo and pilot 2.250" bolt circle flex mount |
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