Belt Speed Demand; Max Belt Spd Demand; Min Belt Spd Demand; Max Spd Demand Delay - MERRICK Genetix Safety, Installation, Operation And Maintenance Manual

duration as long as this delay value for the logical output to be set. This delay
value is set in seconds.

Belt Speed Demand

The following settings are available for Belt Speed Demand limits:
Note: The following setpoint limits will appear in the menu only if Feeder
Control is enabled (see Main Menu > Advanced Setup > Configuration >
Feeder Control ).

Max Belt Spd Demand

Min Belt Spd Demand

Max Spd Demand Delay

Min Spd Demand Delay
Max Belt Spd Demand
If the actual belt speed demand (i.e. controlled variable, or "CV") exceeds this
limit for duration longer than the Max Spd Demand Delay value (see below)
then the logical output "High PID CV" is set. This limit is set in units of percent.
Note also that if speed demand clamping is enabled (see Main Menu >
Advanced Setup > Feeder Control > Settings), the speed demand used by the
controller will be clamped to this limit value even if the PID calculation yields a
larger value. However, in this case the logical output "High PID CV" will still be
set.
Min Belt Spd Demand
If the actual belt speed demand drops below this limit for duration longer than
the Min Belt Speed Delay value (see below) then the logical output "Low PID
CV" is set. This limit is set in units of percent.
Note this limit is only active under the following conditions:
Feeder Control is enabled (see Main Menu > Advanced Setup >
•
Configuration > Feeder Control) and the belt is commanded to run.
Feeder control is not enabled and the logical input "Belt Running" is on.
•
Note also that if speed demand clamping is enabled (see Main Menu >
Advanced Setup > Feeder Control > Settings), the speed demand used by the
controller will be clamped to this limit value even if the PID calculation yields a
smaller value. However, in this case the logical output "Low PID CV" will still be
set.
Max Spd Demand Delay
This value provides a delay for the Max Speed Demand limit, in order to
prevent nuisance alarms. The belt speed demand must remain above the limit
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