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When the “automatic stand-by” function is activated by setting the Pressure Standby
Threshold to something other than OFF the algorithm monitors the controller input.
When the input value leaves the requested band (specified by the “Pressure Standby
Threshold” parameter) the control output assumes immediately the last value stored
when the process was stable. (For steady state condition the process value must
be inside of the requested band [Se- Standby Threshold] for more than one
minute. Once Calculated this value remains unchanged until there is a change of the
setpoint, or changing the controller main state from manual to automatic mode. )
If the process value is inside of the band for more than one minute, the actual
controller output value will be saved to become active during the recovery time and
the delay time phase of standby sequence. Additionally an extra limitation of the
controller output value will be activated to prevent very fast changes in the rotation
speed of the motor by the Standby Active Limit.
Min: [actual controller output - Standby Active Limit]
Max: [actual controller Standby Active Limit]
The freezing of the output of the controller will last for a time specified by the
“Pressure stand-by recovery time” parameter. If the parameter “Pressure standby
recovery time” is set to Off, the controller will set to manual mode and the stored
value for controller output becomes active until otherwise changed.
If the controller input does not recover within the specified time, the output value
is forced to zero. If the controller input recovers within the specified time, the
algorithm wait for two and half time the integral value; after this time has elapsed,
the controller will come back automatically to normal “running” condition (limited by
Standby Active Limit) to the output level calculated when the process was stable.
Auto-manual Start Up:
This parameter setting will allow the user to start the controller in either manual
mode, where they will be able to start their process under their own manual control
output value or in automatic mode where the controller outputs power to control
the process automatically. Tuned values in manual mode should be defined from
manual mode before this setting is changed from its default of starting process in
Manual mode.
Differential Pressure value:
This is always to be calculated as A-B or pressure 1- pressure 2. Only available when
controller has a 2nd Universal input card fitted.
