Parker ac890 - Page 496

Programming D-100
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
Parameter Descriptions
Sets the minimum allowed delay between disabling and then re-enabling PWM production (i.e. stopping and starting the drive).
DRIVE FREQUENCY
PREF: 73.04
Default: —.xx Hz
Range: —.xx Hz
The output frequency provided to the motor.
ACTUAL PWM FREQ
PREF: 73.05
Default:
—. Hz
Range:
—. Hz
The actual pwm switch frequency applied to the motor.
This can reduce in overload conditions in all Control Mode, except
PMAC Control Mode.
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. 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