Rockwell-automation 284E ArmorStart with EtherNet/IP - User Manual Manual de usuario descargar pdf (Pagina 330)

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330 Rockwell Automation Publication 280E-UM001B-EN-P – July 2012

Appendix D PID Setup

PID Deadband

Parameter 238 (PID Deadband) is used to set a range, in percent, of the PID

Reference that the drive will ignore.

Example

• (PID Deadband) is set to 5.0

• The PID Reference is 25.0%

• The PID Regulator will not act on a PID Error that falls between 20.0 and

30.0%

PID Preload

The value set in Parameter 239 (PID Preload), in Hertz, will be pre-loaded into

the integral component of the PID at any start or enable. This will cause the

drive’s frequency command to initially jump to that preload frequency, and the

PID loop starts regulating from there.

PID Limits

Parameter 230 (PID Trim Hi) and Parameter 231 (PID Trim Lo) are used to

limit the PID output and are only used in trim mode. (PID Trim Hi) sets the

maximum frequency for the PID output in trim mode. (PID Trim Lo) sets the

reverse frequency limit for the PID output in trim mode. Note that when the

PID reaches the Hi or Lo limit, the PID regulator stops integrating so that

windup does not occur.

PID Enabled

Freq Cmd

PID Output

PID Pre-load Value

PID Pre-load Value > 0

1 2 ... 325 326 327 328 329 330 331 332 333 334 335 ... 347 348

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