Watlow CLS User Manual
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Contents
CLS User’s Guide
High Deviation Alarm Output Number ..........................91
Low Deviation Alarm Type ............................................92
Low Deviation Alarm Output Number ...........................92
Low Process Alarm Setpoint ..........................................92
Low Process Alarm Type ...............................................93
Low Process Alarm Output Number ..............................93
Alarm Deadband .............................................................93
Alarm Delay.....................................................................94
Manual I/O Test ....................................................................95
Digital Input Testing .......................................................95
Test Digital Output .........................................................96
Toggle Digital Output .....................................................96
Keypad Test ....................................................................96
PID Tuning and Control
97
Introduction ...........................................................................97
Control Modes ......................................................................98
On/Off Control ................................................................98
Proportional Control .......................................................98
Proportional and Integral Control ...................................99
Proportional, Integral and Derivative Control ................100
Control Outputs ...............................................................100
Digital Output Control Forms .........................................100
Setting Up and Tuning PID Loops .......................................103
Proportional Band (PB) Settings .....................................103
Integral Term (TI) Settings .............................................104
Derivative Term (TD) Settings .......................................104
General PID Constants by Application .................................105
Proportional Band Only (P) ............................................105
Proportional with Integral (PI) ........................................105
PI with Derivative (PID) .................................................105
Troubleshooting
107
No Key Reset ..................................................................107
Returning your Unit ........................................................108
Troubleshooting Stand-Alone Systems ................................108
Checking an Analog Input ..............................................108
Checking Digital I/O .......................................................109
Checking Computer Supervised Systems .............................110
Computer Problems ........................................................110
Software Problems ..........................................................111
Changing the EPROM ....................................................111