Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page D-77
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PATTERN GEN
SETUP::MOTOR CONTROL::PATTERN GEN
Designed for all Motor Control Modes.
The pattern generator function block allows you to configure the Drive PWM (Pulse Width Modulator) operation.
Parameter Descriptions
RANDOM PATTERN
PREF: 73.01 Default: TRUE Range: FALSE / TRUE
This parameter selects between random pattern (quiet motor noise) or the more conventional fixed carrier PWM strategies.
When TRUE, random pattern is enabled.
FREQ SELECT
PREF: 73.02 Default: 3000 Hz Range: 3000 to 6000 Hz
This parameter selects the pwm switching frequency of the output power stack.
The higher the switching frequency, the lower the level of motor audible noise. However, this is only achieved at the expense
of increased Drive losses and reduced stack current rating.
DEFLUX DELAY
PREF: 73.03 Default: 2.0 s Range: 0.1 to 10.0 s
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.
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