Quantum Devices, Inc. Model QR787 is intended for applications requiring high performance, high-resolution digital feedback in a very small package. The model QR787 provides the resolution of larger encoder packages but in a package only 20 mm (0.787″) in diameter. Outputs can be configured in either single ended, 5 volt RS-422 differential or with high voltage differential line driver. QDI’s patented sensing scheme embodies a much simplified encoder design, which ultimately results in longer service life and less downtime 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.
Note: prior to transitioning to RoHS-compliant, the product name was QD787 rather than QR787. Therefore, when cross-referencing a QD787 configuration, simply substitute the configuration prefix with QR787.
| Input Voltage | 5 VDC ± 5% or 5-26 VDC |
|---|---|
| Input Current Requirements | 100 mA Max. output option 01 & 02, 50mA max output option 03; plus interface loads |
| Input Ripple | 2% peak to peak @ 5 VDC |
| Output Circuits | 01 = TTL output (single-ended) 02 = 26C31 line driver (RS-422) 03 = OL7272 high voltage line driver |
| Output Format | Quadrature with A leading B for CW rotation Ungated Z index pulse true over A and B high |
| Max Operating Frequency | 200 kHz |
| Symmetry | 180° electrical ± 10% |
| Minimum Edge Separation | 54° electrical |
| 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 @ 11 ms duration |
| Maximum Shaft Speed | 8000 RPM |
|---|---|
| Nominal Shaft Diameter | 0.125" |
| Shaft Material | Stainless steel |
| Bearings | Radial ball bearing, R2 type |
| Radial Shaft Load | 2 lb maximum |
| Axial Shaft Load | 1 lb 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 with 2x5 connector |
| Mounting | Servo |
| Moment of Inertia | 9.5x10⁻⁶ oz·in·s² |
| Acceleration | 1x10⁵ radians/s² |
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Consult factory for configurations not shown (e.g. resolution, commutation, etc.).
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