HEIDENHAIN iTNC 530 HSCI - Page 619

July 2013 6.1 Control loops 619
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, 10000 Hz
or by way of: Maximum signal frequency of motor encoder = 400 kHz or 800 kHz
(depending on MP2561.x 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:
n
max
= 11718.75 min
–1
Example 2:
n
max
= 23437.5 min
–1
Switching the maximum input frequency for motor encoders through
MP 2561.x bit 0 to 800 kHz may be necessary for high-speed motors
or spindles, depending on the resolution of the motor encoder. The
precondition is that the encoder be suitable for this frequency range
and still be able to provide a sufficient signal amplitude at 800 kHz.
Machine interfacing iTNC 530
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
=