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14
BD SERVO DRIVES USER GUIDE
Pin 9 Fault Output
Pin 9 is an open collector fault output signal which goes low when a fault occurs. The output can
be pulled up to a maximum voltage of +28V, and the output transistor can pass a maximum
current of 25mA.
Pin 10 to 15 Encoder Outputs
Pins 10 to 15 are buffered encoder outputs using 26LS31 line drivers. Use twisted pair screened
cable and 26LS32 line receivers or optos.
Note: Particular care should be paid to these outputs to prevent EMC radiation problems. When
using line receivers - connect the screen to earth at both ends of the cable. In this configuration
the drive and controller should be mounted close together sharing the same ground plane.
For opto receivers - connect the screen to earth at the drive end only.
CAUTION - Avoid turning the Tach Gain potentiometer
fully CCW in velocity mode. This will result in the motor
running at maximum speed regardless of the input voltage.
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