Watlow ez-zone pm - Chapter 9: Features; PID Tuning and Autotuning

Watlow EZ-ZONE
®
PMI Controller • 179 • Chapter 9 Features
Changing PM Integrated Model Number to PM Express ......181
Saving and Restoring Settings .......................182
Tuning the PID Parameters ..........................183
Autotune ................................................183
Manual Tuning ...........................................184
Autotuning with TRU-TUNE+
® ......................................184
Inputs ........................................185
Calibration Offset .........................................185
Calibration ..............................................186
Filter Time Constant .......................................188
Sensor Selection .........................................188
Sensor Backup ...........................................188
Set Point Minimum and Maximum ...........................188
Scale High and Scale Low ..................................188
Range High and Range Low .................................189
Receiving a Remote Set Point ...............................189
Ten Point Linearization .....................................190
Outputs .......................................190
Duplex .................................................190
NO-ARC Relay ...........................................190
Retransmitting a Process Value or Set Point ....................191
Cool Output Curve ........................................192
Resetting a Tripped Limit ...........................192
Control Methods .................................193
Output Configuration ......................................193
Auto (closed loop) and Manual (open loop) Control ..............193
On-Off Control ...........................................194
Proportional and (P) Control ................................195
Proportional and Integral (PI) Control .........................195
Proportional, Integral and Derivative (PID) Control ...............196
Dead Band ..............................................196
Variable Time Base ........................................197
Single Set Point Ramping ..................................198
Cascade Control ..........................................198
Compressor Control .......................................198
Differential Control ........................................199
Ratio Control ............................................199
Duplex Control ...........................................199
Motorized Valve Control ....................................199
9
Chapter 9: Features