ElmoMC SimplIQ Servo Drives Composer User Manual - Manual (Page 17)

• Absolute Single Turn Position Resolution–a drop down menu that represents, in
terms of bits, single-turn feedback cycle. The number of counts would be 2^number
of bits. This value is practically the digital absolute resolution derived from the
feedback and can be read from the encoder data sheet. Sine/cosine resolution
improves this value but is derived from firmware manipulation. The value can be
read from the encoder data sheet.
• Absolute Multi-Turn Position Resolution– a drop down menu that represents, in
term of bits, the multi-turn feedback resolution. The number of full mechanical
resolution without loosing the origin (absolute position) is 2^number of bits turns.
• Sine/Cosine Periods per Revolution– a drop down menu that represents the
number of sine/cosine signal cycles per mechanical revolution. After the absolute
position is determined by the SimplIQ drive (typically after power up), the position
is calculated from the sine/cosine signals and the “Multiplication Factor”.
Note:
The following should apply:
1. SINGLE-TURN + MULTI-TURN ≤ 32 bit resolution
2. SINGLE-TURN ≤ 32 and MULTI-TURN ≤ 16 bit resolutions
By clicking on the “Next” button, the “Commutation Feedback Parameter II”
window will appear. The Composer updates the drive with the relevant
commutation and feedback parameters needed.
• Multiplication Factor – is a drop down list that represents, in term of bits, the
number of position counts in one cycle of the analog (Sine\Cosine) signal. The
limitation for the multiplication factor are:
For rotary motors:
N
Factor tion Multiplica
TURN MULTI ∗ +
≤
) 1 2 (
10
_
9
Where:
Composer User Manual Using the Wizard
MAN-COMPUM (Ver. 1.9)
2-9