ElmoMC SimplIQ Command Reference - Manual (Page 30)

CA[18] Feedback bits (“counts”) per revolution, after resolution is multiplied by 4,
in the range [6…530,000,000].
- For Standard Incremental Encoders or Absolute encoders with
Sin/Cosine signals with 1000 lines, CA[18] is 4000.
If the motor is linear, CA[18] reflects the electrical cycle. For example, if
the encoder has 1000 lines/m (4000 counts/m) and the distance between
pole sets is 0.1 m, then CA[18] is 400. In this example, CA[18] could be set
as any multiple of 400, such as CA[18]=800 or CA[18]=1200.
- For systems with Halls only, CA[18] is calculated as CA[19] * 6.
- For Analog Encoders, the resolution is multiplied by 2
CA[31] . For example,
if the analog encoder has 2000 lines and CA[31] is 8, then CA[18] will be
512,000.
- For Resolver feedback CA[18] is calculated as 2 16 - CA[34] * Resolver pole
pair. For example, if the Resolver resolution is 10 bits and has 1pole pair
then CA[34]=16-10=6, and CA[18]= 2
16-6 =1024.
- For Tachometer feedback the resolution is statically set to 65,536.
Table 3-5: CA Vector - Feedback Setup Parameters
The parameters in the tables that follow are required for commutation setup.
Command Description
CA[19]
Number of motor pole pairs [1…50].
The number of feedback counts per electrical revolution is CA[18]/CA[19].
For good commutation, the number of feedback counts per electrical
rotation should be at least 36. Practically, there is no high limit to the
number of encoder lines per pole pairs. It is a long integer number that the
drive ultimately modulates to 1024.
CA[20] Digital Hall sensors present:
0: No digital Hall sensors are connected. If the commutation angle is not
yet known, then at motor on, a commutation search will be made. No
digital Hall input consistency checks will be made.
1: Digital Hall sensors are connected. Upon motor on, commutation will
be performed according to the digital Hall sensors. Continuous
encoder-based commutation will begin when the first Hall edge is
identified. The drive performs commutation checks by continuously
comparing the encoder-derived commutation angle with the Hall
sensor recorded status.
CA[21] Position sensor present:
0: Ignore the position sensor inputs. Commutation will be based on the
digital Hall sensors only.
1: The position sensor will be used for commutation.
SimplIQ Command Reference Manual Alphabetical Listing
MAN-SIMCR (Ver. 4.5)
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