EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE
73 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)
ENHANCED PID
Function Standard PID function with additional features such as built-in start-up ramp, direct-
reverse action selection, integral recalculation to prevent windup below
minimum/above maximum, and an auxiliary input for limit applications and integral
reset.
The following diagram compares the system response characteristics of the PID
versus the EPID.
I/O Dialog Box
Inputs Inp = input value
SPt = setpoint
Ena = enable
SRT = start ramp time
OSV = output start value
Aux = auxiliary input
When the enable input (Ena) is turned on, the EPID output starts at the desired
output start value (OSV) and changes slowly as needed to bring the controlled
variable (Inp) to its setpoint (SPt). Start-up ramp time (SRT) controls the rate of
change of the output during the start-up period. Specifically, SRT is the minimum
amount of time it takes for the output to go from the output start value to either 0 or
100 percent. The auxiliary input (Aux) is primarily intended for applications where
EPID is used for high or low limit applications.
When the enable input is off, the EPID output is set to the OSV.
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