HEIDENHAIN MANUALPLUS 620 - Page 1045

January 2012 6.19 Configuring the Controller Unit and Drive Motors 1045
Maximum motor
speed
n
max
: Maximum motor speed [min
–1
]
f
PWM
: PWM frequency [Hz]
p: Number of pole pairs
The following PWM frequencies are available:
3333 Hz, 4000 Hz, 5000 Hz
With option 49: 6666 Hz, 8000 Hz, 10 000 Hz
or by way of: Maximum signal frequency of motor encoder = 400 kHz or 800 kHz
(depending on MP_vCtrlEncInputFunc bit 0)
Calculation of maximum motor speed:
n
max
: Maximum motor speed [min
–1
]
f
max
: Maximum signal frequency of motor encoder [kHz]
STR: Encoder line count
Example 1:
nmax = 11718.75 min
–1
Example 2:
nmax = 23437.5 min
–1
Maximum feed rate by
way of:
Maximum signal frequency of the position encoder:
 At 1 Vpp: 27 kHz or 400 kHz
 At 11 µA
PP
: 27 kHz or 140 kHz
Calculation of the maximum feed rate Fmax:
F
max
: Maximum feed rate [m/min]
f
max
: Maximum signal frequency of position encoder [kHz]
SP: Signal period of the position encoder [kHz]
Example:
Fmax = 480 m/min
Machine interfacing MANUALplus 620
f
PWM
· 60000 min
-1
p · 5000 Hz
n
max
=
f
max
· 60000 [s/min]
STR
n
max
=
400 kHz · 60000 [s/min]
2048
n
max
=
800 kHz · 60000 [s/min]
2048
n
max
=
SP · f
max
· 60
-3
F
max
=
m · s
µm · min
F
max
=
m · s
µm · min
20 µm · 400 kHz · 60
-3