csmstr - Omega Engineering

CSSG – STRAIN GAGE INPUT PID MODULE PROGRAMMING
CRIMSON USER MANUAL - MODULAR CONTROLLER
required output to reach and maintain setpoint, and acts accordingly. In manual
mode, the output can be controlled directly by writing to the power variable.
• The Initial Setpoint property is used as the setpoint value upon initialization.
• Manual Power is the level the PID module will assume in manual mode. Values
in excess of 100% and –100% can be entered to overcome the limitations caused
by Power Transfer values, such as gains and offsets that would otherwise limit
the outputs to less than their maximums.
• The Download Scaling property determines which scaling values, if any, will be
downloaded to the module. To avoid overwriting the scaling values of a
calibrated process, set this value to No.
SMARTONOFF
SmartOnOff is designed for situations where on-off control would normally be used, but
where the advantages of PID are also desired. When the reverse or direct output is placed into
this mode, the control output will either be driven on or off, with no intermediate values or
time proportioning. However, rather than use the process value to decide when to turn the
output on, SmartOnOff looks at the output of the PID calculation and activates the output
when it exceeds half the defined gain for that channel. For example, with default settings,
SmartOnOff for the reverse output would turn the output on once the PID algorithm called for
50% power or more, with the hysteresis value being used to ensure that small changes in the
PID calculation do not produce relay chatter.
• The Hysteresis property is used to eliminate output chatter by separating the on
and off points of the output(s) when performing SmartOnOff control. The
Hysteresis value is centered around the setpoint, that is, the transition points of
the output will be offset above and below the setpoint by half of the Hysteresis
value.
THE CONTROL TAB
PAGE 36
http://www.redlion.net/controller