User guide

Watlow EZ-ZONE
®
PM PID Controller • 83 • Chapter 9 Features
9
Chapter 9: Features
Changing PM PID Model Number to PM Express .................84
How to Change the Control Model Number to a PM Express ........85
How to Restore Original PM Model Number ....................85
Saving and Restoring User Settings ..........................85
Programming the Home Page ..............................86
Tuning the PID Parameters ................................86
Manual Tuning ...........................................87
Autotuning with TRU-TUNE+
®
...............................87
Inputs ..............................................88
Calibration Offset .........................................88
Calibration ..............................................88
Set Point Low Limit and High Limit ...........................90
Scale High and Scale Low ..................................90
Range High and Range Low .................................91
Ten Point Linearization .....................................91
Outputs .............................................91
Duplex .................................................91
NO-ARC Relay ...........................................92
Retransmitting a Process Value or Set Point ....................92
Cool Output Curve ........................................93
Control Methods .......................................93
Output Configuration ......................................93
Auto (closed loop) and Manual (open loop) Control .............. 93
On-Off Control ...........................................94
Proportional Control ....................................... 95
Proportional plus Integral (PI) Control .........................96
Proportional plus Integral plus Derivative (PID) Control ...........96
Dead Band ..............................................96
Variable Time Base ........................................97
Single Set Point Ramping ...................................98
Alarms ..............................................99
Process and Deviation Alarms ...............................99
Alarm Set Points ..........................................99
Alarm Hysteresis .........................................99
Alarm Silencing .........................................100
Alarm Blocking .......................................... 100
Open Loop Detection ...................................100
Programming the EZ Key/s ...............................101
Using Lockout and Password Security .......................101
Modbus - Using Programmable Memory Blocks ................104
Software Configuration .................................105