Name: Allen-Bradley PowerFlex 525
Brand: Allen-Bradley
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Rockwell Automation Publication 520-UM001G-EN-E - September 2014 219

PID Set Up Appendix F

• A459 [PID 1 Ref Sel] = 6 “4-20mA Input”

PID Deadband

Parameters A465 and A477 [PID x Deadband] are used to set a range, in percent,

of the PID Reference that the drive will ignore.

Example

• A465 [PID 1 Deadband] = 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 A466 or A478 [PID x Preload], in Hz, 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

A456 and A468 [PID x Trim Hi] and A457 and A469 [PID x Trim Lo] are used

to limit the PID output and are only used in trim mode. [PID x Trim Hi] sets the

maximum frequency for the PID output in trim mode. [PID x Trim Lo] sets the

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

0102030405060708090100

PID Reference (%)

4-20 mA Input

PID Enabled

Freq Cmd

PID Output

PID Pre-load Value

PID Pre-load Value > 0

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