A p p e n d i x D : P r o g r a m m i n g
D-93
AC890PX AC Drive
Parameter Descriptions
PWM FREQ PMAC
PREF: 73.11
Default: 0
Range: See below
This parameter defines the frequency of the PWM in PMAC Control mode
Enumerated Value
:
PWM FREQ PMAC
0 : 4 kHz
1 : 8 kHz
2 : OTHERS
The following restrictions apply to the switching frequency:
-
For frames B to D, no restriction
-
For all other frames the switching frequency is fixed at 4kHz
‘OTHERS’ is used in conjunction with the ‘FREQ SELECT’parameter for test purposes only. It is effective only when used with an ENDAT
encoder type, otherwise the switching frequency is fixed at 4kHz.
Functional Description
The Drive provides a unique quiet pattern PWM strategy in order to reduce audible motor noise. The user is able to select between the quite pattern
or the more conventional fixed carrier frequency method. With the quiet pattern strategy selected (random pattern enabled), audible motor noise is
reduced to a dull hiss.
In addition, the user is able to select the PWM carrier frequency. This is the main switching frequency of the power output stage of the Drive. A
high setting of carrier frequency (e.g. 6kHz) reduces audible motor noise but only at the expense of higher Drive losses and smooth motor rotation
at low output frequencies. A low setting of carrier frequency (e.g. 3kHz), reduces Drive losses but increases audible motor noise.
Содержание AC890PX Series
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