curlyandshemp
Lifetime Supporting Member
I am on a jobsite we inherited from previous integrator. One issue the customer has is the PID control of a 30hp exhaust fan moving 1000 cfm of air from a dryer. The previous intergrator had the accel @ 40 seconds and the decel @ 60 seconds to compensate for programmming issues that was messing up the PID control which I have since resolved. I wish to speed up the response of the VFD, but I know there a limit as to how low the accel and decel should go. The previous intergrator decide on a variable speed fan rather than adjustable dampners. I am thing dropping the accel and decel down to about 20 seconds each. Before actually trying this, based on the size of the motor and volume of airflow, do these numbers seem reasonable?