Quantum Devices, Inc. Model QD787 Is intended for applications requiring high performance, high-resolution digital feedback in a very small package. The model QD787 provides the resolution of larger encoder packages, but in a package only 20mm (0.787″) in diameter. Outputs can be configured in either single ended, open collector or internal pull up resistor, or with an industrial standard RS 422A differential line driver. QDI’s patent pending sensing scheme embodies a much simplified encoder design, which ultimately results in longer service life, and less down time due to feedback device failure. The encoder housing is constructed of a conductive carbon fiber composite that provides the EMI shielding of an all metal housing and performance of a lightweight robust assembly.
Design Features:
| Input Voltage | 5 VDC +/- 5% or 5-26 VDC |
|---|---|
| Input Current Requirements | 80 mA Max. Output Option 01 & 02, 35mA Max Output Option 03; Plus interface Loads |
| Input Ripple | 2% Peak to Peak @ 5 VDC |
| Output Circuits | AM26LS31 RS 422A line driver TTL Output OL7272 Line Driver |
| Output Format | Quadrature with A leading B for CW Rotation. Index centered over A |
| Frequency Response | 200 kHz |
| Symmetry | 180 Degrees +/- 10% |
| Minimum Edge Seperation | 54 Electrical degrees max |
| Storage Temperature | -40 to 125°C |
|---|---|
| Operating Temperature | 0 to 70° C Typical -20 to 100° C Optional |
| Humidity | 98% Non-Condensing |
| Vibration | 20 g's @ 50 to 500 CPS |
| Shock | 50 g's @ 11mS Duration |
| Maximum Shaft Diameter | 8000 RPM |
|---|---|
| Shaft Diameter | 0.125" |
| Shaft Material | Stainless Steel |
| Bearings | Radial Ball Bearing, R2 type |
| Radial Shaft Load | 2 lbs. Maximum |
| Axial Shaft Load | 1 lbs. Maximum |
| Housing | Carbon Fiber Composite (case ground via Connector) |
| Housing Volume Resistivity | 10⁻² ohm-cm |
| Termination | Two Rows of 5 Pins on 0.100" Centers 8" Ten Conductor Ribbon Cable wi 2x5 connector |
| Mounting | Servo |
| Moment of Inertia | 9.5x10⁻⁶ oz-in-sec² |
| Acceleration | 1x10⁵ Radians per Second² |
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