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Gain (V5006)
Gain specifies the Proportional value used in the PID control algorithm. Some temperature controllers
have a proportional band adjustment instead of a Gain adjustment. Gain is the inverse function of the
proportional band. This means that the gain settings of 5, 1, and .5 would be equal to the proportional
band settings of 20, 100 and 200% of temperature span. Gain is read by the temperature controller
when bit 0 of the Mode Word is set, or written by the controller after gain has been calculated by the Auto
Tune feature.
If you are accustomed to working with proportional band (PB) values expressed in temperature units you
may use the following formula to convert PB in EC or EF to Gain.
Gain = 1310.7/PB ( EC or EF)
Example: PB = 100 ( EC or EF), Gain = 1310.7/100 = 13.1 (V5006 = 131)
PB ( EC or EF) = 1310.7/Gain
Example: Default Gain = 200.0 (V5006=2000), PB = 1310.7/200.0 = 6.6 ( EC or EF)
Reset (V5007)
Reset specifies the Integral action used in the PID control algorithm. This integral control action is
sometimes called Automatic Reset. A value of 0 disables the Integral term. Reset is read by the
temperature controller when bit 0 of the Mode Word is set, or written by the controller after reset has
been calculated by the Auto Tune feature.
Rate (V5010)
Rate specifies the Derivative value used in the PID control algorithm. A value of zero disables the
Derivative term. Rate is read by the temperature controller when bit 0 of the Mode Word is set, or
written by the controller after rate has been calculated by the Auto Tune feature.
Temperature Low Alarm (V5011)
The Temperature Low Alarm occurs when the temperature falls below the value programmed in this
location. This value is read by the temperature controller when bit 0 of the Mode Word is set.
INSTALLATION AND WIRING
2.17
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