Position Loop Resolution; Analog Axes - HEIDENHAIN TNC 426 PB/M Technical Manual

Position loop
resolution

Analog axes

6 – 128
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.
v [mm/min] = --------------------------------------------------- - [1/min] Ball screw pitch [mm]
max
No. of pole pairs
Analog axes:
7 7 7 7 In MP1050.x, enter the desired analog voltage for rapid traverse.
7 7 7 7
Adjust the rapid traverse feed rate (v
servo amplifier.
MP1010.0-8 Rapid traverse in axes 1 to 9
Input: 10 to 300 000 [mm/min]
MP1020.0-8 Manual feed rate for axes 1 to 9
Input: 10 to 300 000 [mm/min]
MP1050.0-8 Analog axes: Analog voltage for rapid traverse in
axes 1 to 9
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.
Pos. loop resolution [µm]
The TNC 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.
24 000
⋅
) with the analog voltage at the
max
signal period [µm]
= --------------------------------------------------------
1024
HEIDENHAIN Technical Manual TNC 426, TNC 430
Set Reset
PLC PLC
NC/PLC PLC
NC NC
NC NC
:
a