User Manual

Connecting the Encoder
Advanced Digital Motor Controller User Manual 59
Ferrite Core
Encoder
Controller
FIGURE 3-20. Use ferrite core on cable length beyond 2’ or 60cm
Important Warning
Excessive cable length will cause electrical noise to be captured by the controller
and cause erratic functioning that may lead to failure. In such a situation, stop oper-
ation immediately.
Motor - Encoder Polarity Matching
When using encoders for closed loop speed or position control, it is imperative that when
the motor is turning in the forward direction, the counter increments its value and a posi-
tive speed value is measured. The counter value can be viewed using the PC utility.
If the Encoder counts backward when the motor moves forward, correct this by either:
1- Swapping Channel A and Channel B on the encoder connector. This will cause the en-
coder module to reverse the count direction,
2- Enter a negative number in the PPR configuration will also cause the counter to count
in the reverse direction
3- Swapping the leads on the motor. This will cause the motor to rotate in the opposite
direction.