User Manual Owner's manual

Rockwell Automation Publication 280E-UM001B-EN-P – July 2012 329
PID Setup Appendix D
PID Reference and Feedback
Parameter 232 (PID Ref Sel) is used to enable/disable the PID mode. Select
Option 0 (PID Disabled) to disable or Option 1 to select the source of the PID
Reference. If Parameter 232 (PID Ref Sel) is not set to 0 (PID Disabled), the PID
can still be disabled by selecting the programmable Digital Input options
(Parameters 151…154) such as Jog, Local, or PID Disable.
Parameter 233 (PID Feedback Sel) is used to select the source of the PID
feedback.
Options Description
0
PID Disabled
Disables the PID loop (default setting)
1
PID Setpoint
Selects Exclusive Control. Parameter 237 (PID Setpoint) will be used to set the value of the PID
Reference
4
Comm Port
Selects Exclusive Control. The reference word from a communication network DeviceNet
™
becomes the PID Reference. The value sent over the network is scaled so that Parameter 135
(Maximum Freq) x 10 = 100% reference. For example, with (Maximum Freq) = 60 Hz, a value
of 600 sent over the network would represent 100% reference.
5
Setpnt, Trim
Selects Trim Control. Parameter 237 (PID Setpoint) will be used to set the value of the PID
Reference.
8
Comm, Trim
Selects Trim Control. The reference word from a communication network DeviceNet becomes
the PID Reference. The value sent over the network is scaled so that Parameter 135
(Maximum Freq) x 10 = 100% reference. For example, with (Maximum Freq) = 60 Hz, a value
of 600 sent over the network would represent 100% reference.
Option Description
2
Comm Port
The Consumed Assembly (Instance 164 – Default Consumed Inverter Type Distributed Motor
Controller) from a communication network which becomes the PID Feedback. The value sent
over the network is scaled so that Parameter 135 (Maximum Freq) x 10 = 100% Feedback. For
example, with (Maximum Freq) = 60 Hz, a value of 600 sent over the network would
represent 100% Feedback.
Speed Reference
0 Volts
PID Feedback =
Dancer Pot Signal
10 Volts
PID Reference =
Equilibrium Set Point