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.
Design Features:
| Input Voltage | 4.75 to 26 VDC |
|---|---|
| Input Current Requirements | 70mA Typical @ 5VDC Plus Interface Loads |
| Input Ripple | 2% Peak to Peak @ 5VDC |
| Output Circuits | OL7272 High Voltage Line Driver: VOL = .5V Max @ 20mA Sink VOH = Vcc-.8V @ 20mA Source RS422 compatible @ 20mA Source Open Collector Output: Sink up to 100mA |
| Incremental Output Format | Quadrature outputs with index pulse. |
| Accuracy | +/-1.0 arc minute |
| Frequency Response | 500 kHz |
| Symmetry | 180 Degrees +/- 10% |
| Minimum Edge Separation | 54 electrical degrees at 100 kHz |
| Code | Incremental |
| Rise Time | Less than 1 µS |
| Electrical Protection | Reverse protected to .6 A Cont. 4 amp for 1 µS. 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 |
| Sealing Option | IP 66 Solid Shaft, IP 64 Hollow Shaft |
| Maximum Shaft Speed | 8000 RPM (see factory for higher shaft speed) |
|---|---|
| Hollow Shaft Diameter Tolerance | 0.375", 0.500", 0.625" (+.0006" to -.0000") |
| Solid Shaft Diameter Tolerence | 0.250", 0.375", 10mm (+.0000" to -.0004") |
| Shaft Runout | 001 T.I.R. (Max) |
| 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/ Sec² |
| Starting Torque | 1.0 in-oz Max with no seal, 3.0 in-ox with shaft seal |
| Radial Shaft Loading | 40 lbs, (80 lbs Max) |
| Axial Shaft Loading | 40 lbs, (80 lbs 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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