137
User Defined Motors
Dynamic Alignment Method
This method is used at EMERSON Motion Control to establish the alignment on motors. It is
accomplished by spinning the motor CCW with another device while monitoring U and V
SR
.
Then while the motor is spinning CCW, the encoder body is rotated on it’s mounting until the
desired alignment is established. The encoder is then locked down. This will cause the rising
edge of V to line up with the rising edge zero crossing of V
RT
when the encoder reference
rotation is CCW.
Figure 86: CCW Alignment Plot
Static Alignment Method
Another method to align the encoder is to apply DC current through the motor power phases
R to S and rotate the encoder on its mounting until the rising edge of U is detected with a
voltmeter or an oscilloscope. This procedure does not require spinning the motor.
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