Position Loop Resolution; Analog Axes - HEIDENHAIN iTNC 530 Technical Manual

Position loop
resolution

Analog axes

February 2002
Digital axes:
For digital axes, the maximum feed rate also depends on the number of pole
pairs in the drive motor and the pitch of the ballscrew.
30 000
v [mm/min] =
max
No. of pole pairs
Analog axes:
7 In MP1050.x, enter the desired analog voltage for rapid traverse.
7
Adjust the rapid traverse feed rate (v
servo amplifier.
MP1010.x Rapid traverse
Input: 10 to 300 000 [mm/min]
MP1020.x Manual feed
Input: 10 to 300 000 [mm/min]
MP1050.x Analog axes: Analog voltage at rapid traverse
Input: 1 000 to 9 000 [V]
Digital axes: without function
Input: 1
M4587 Feed rate limit exceeded F MAX
D596 Max. feed rate from PLC [mm/min]
D360 Programmed feed rate
D388 Current tool feed rate [mm/min]
The encoder signals are interpolated 1024-fold.
Position loop resolution [µm] =
The iTNC outputs a voltage per position error. The 10-V analog voltage is
subdivided 65536-fold with a 16-bit D/A converter. This results in a smallest
voltage step of 0.15 mV.
Rapid traverse (MP1010.x) is attained at a certain voltage (MP1050.x). This
results in the voltage ∆U per position error or following error s
∆
MP1050.x [mV]
U
= ---------------------------------------- -
S [µm]
a
If ∆U is divided by the smallest possible voltage step (0.15 mV), the result is
the number n of the possible voltage steps per position error.
The Control Loop
[1/min] · ballscrew pitch [mm]
) with the analog voltage at the
max
Signal period [µm]
1024
Set Reset
PLC PLC
NC/PLC PLC
NC NC
NC NC
:
a
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