Sevcon Dragon8 - Page 42

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UVW Commutation Sensors
Figure 15 - Sample wiring for a UVW commutation sensor (encoder pin names may vary).
6 digital inputs are provided for differential UVW encoders, with a 5-10V power supply. The encoder
should provide one pulse on each UVW channel per electrical cycle of the motor, and each pulse should
be 120° out of phase with the others and have a 50% duty cycle. The RS422 inverse of these signals must
also be present on the ~U,~V,~W inputs.
Figure 16 shows an example pulse train for the U, V and W inputs.
Figure 16 - Example pulse train from a UVW commutation sensor
V
DD
V
SS
U
V
W
Dragon8 Controller
* Encoder power supply +
22 Encoder ground
2 Encoder_A/SIN/U
10 Encoder_B/COS/V
16 Encoder_W
UV
W
UVW encoder