Base PWM Frequency
The base frequency is used to calculate the operating frequency of all PWM outputs.
Aux PWM Frequency
This setting should be set to 255 wherever possible. It determines the pulse frequency of each PWM output according to the following formula.
Output frequency = 255 / Aux PWM Frequency * Base PWM Frequency.
ie: By setting the Base PWM Frequency to 20 Hz and the Aux PWM Frequency to 200 will result in an output frequency of 25.5 Hz. ( 255 / 200 * 20 = 25.5 )
NOTE: Reducing the Aux PWM Frequency number will increase the frequency for the output but there is a trade off.
The duty cycle adjustment resolution of the output will be reduced.
ie: If this frequency number is reduced to 100 for example, the output frequency would increase, but the adjustment resolution will be reduced from 255 to 100 increments.