Next, the encoder needs to initialized and congured.
In applications with Induction Motors, the Encoder Synchronization function
can be used to determine the correct A/B phasing of the encoder channels
and whether the direction needs to be inverted for the correct direction of
travel.
For IM motors, the Encoder Synchronization can be adjusted at parameter:
• Encoder Synchronization LL07 = Start
Proceed to section 5.10.3 (IM only)
When using PM motors, the encoder position/pole must also be learned.
This step is unique to PM applications and does not need to be done with
IM machines. Knowing the motor pole position relative to the encoder
allows the KEB drive to apply the proper stator magnetic eld commutation
angle for maximum torque.
For absolute encoders on PM motors, if at any time the physical
relation between the motor shaft and encoder changes (i.e. encoder
replaced, encoder slippage, etc.) the encoder position must be
relearned.
There are 2 functions available to determine the encoder pole position with
PM machines:
1. Stationary Pole Identication (SPI) - The SPI process can learn the
encoder position without movement (i.e. ropes on and brake set),
but does not determine whether the A/B encoder channels must be
swapped - this would be determined iteratively and is described later.
2. Encoder Pole Learn - This function will determine the encoder position
but requires sheave movement with a relatively frictionless load (i.e.
balanced car or unroped sheave). The benet of this method is that
proper A/B phasing can be determined automatically.
5.10 Encoder Learn
100
Initial Startup
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