Accel/Decel; Filters - MERRICK Genetix Safety, Installation, Operation And Maintenance Manual

Accel/Decel

Selection of this menu item shows you the settings that allow you to control how
rapidly the Belt Speed Demand signal is allowed to change, and therefore provide
a certain amount of dynamic output protection. These parameters are set in
percent/second (%/s). For example, a setting of 100 allows the Belt Speed
Demand signal to change from 0 to maximum in 1 second.
Max Accel
Max Decel
Note: Setting these parameters too low can defeat the settings of the PID control
and result in very slow response. Normally the factory settings should produce
reasonable results.
Also note that many drives (especially Variable Frequency Drives or Inverters)
have their own settings for Acceleration and Deceleration and these should always
be verified as part of the feeder setup process. Again, if the drive Accel/Decel
parameters are set too low, this can defeat the settings of the PID control.

Filters

Filters are a means of averaging certain process data to improve the smoothness
of the control or to compensate for "noisy" data. The averaging is performed by
means of a sliding average, and the extent of the averaging can be set by the
number of "slots". The following process parameters have filtering available. They
are described along with their effects on the control system.
Speed
Load
Setpoint
PID Feedrate
Speed
In some cases the speed signal generated by the feeder tacho(s) is unusable to
calculate feedrate as-is because of mechanically generated noise, for example
an out-of-round pulley. In these cases, a sliding average algorithm calculates
an average speed with less noise. This parameter is settable between 1 and 33
slots, with 1 representing no averaging. The result of the averaging is used in
feedrate calculations.
Note: The Speed signal can be further "damped" for display purposes only (see
Main Menu > Display Settings > Damping > Speed).
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