Program features 123
Reference trimming
In reference trimming, the external reference is corrected depending on the
measured value of a secondary application variable. The block diagram below
illustrates the function.
Settings
Parameter Additional information
1102 REF1/2 selection
4230 …4232 Trimming function settings
4201 …4229 PID control settings
Group 20 LIMITS Drive operation limits
REF’
0
max. freq
PID2 ref
Mul.
Add
PID2
Select
REF1 (Hz/rpm) /
REF2 (%)
1
)
Mul.
Switch
2)
Switch
PID2 act
PID2
REF1
(Hz/rpm) /
REF2 (%)
1)
output
REF1 (Hz/rpm) / REF2 (%) = The drive reference before trimming
REF’ = The drive reference after trimming
max. freq = par. 2008 (or 2007 if the absolute value is greater)
PID2 ref = par. 4210
PID2 act = par. 4214…4221
1)
REF1 or REF2 depending on which is active. See parameter 1102.
2)
When par. 4232 = PID2REF, the maximum trimming reference is defined by parameter
1105 when REF1 is active and by parameter 1108 when REF2 is active.
When par. 4232 = PID2OUTPUT, the maximum trimming reference is defined by parameter
2008 value.
1105 REF1 MAX /
1108 REF2 MAX
2)
4230
4231 TRIM SCALE
2 (DIRECT)
1
(PROPORTION
AL
)
0 (NOT SEL)
4232 CORRECTION SRC
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