Program features 119Reference trimmingIn reference trimming, the external reference is corrected depending on themeasured value of a secondary application variable. The block diagram belowillustrates the function. SettingsParameter Additional information1102 REF1/2 selection4230 …4232 Trimming function settings4201 …4229 PID control settingsGroup 20 LIMITS Drive operation limitsREF’0max. freqPID2 ref4232 CORRECTION SRC4231 TRIM SCALE1105 REF1 MAX /Mul.AddPID24230SelectDIRECT (2)PROPOR. (1)NOT SEL (0)REF1 (Hz/rpm) /REF2 (%)1 )Mul.Switch 2)SwitchPID2 actPID2REF1(Hz/rpm) /REF2 (%) 1)1108 REF 2 MAX 2)outputREF1 (Hz/rpm) / REF2 (%) = The drive reference before trimmingREF’ = The drive reference after trimmingmax. freq = par. 2008 (or 2007 if the absolute value is greater)PID2 ref = par. 4210PID2 act = par. 4214…42211) REF1 or REF2 depending on which is active. See parameter 1102.2) When par. 4232 = PID2REF, the maximum trimming reference is defined by parameter1105 when REF1 is active and by parameter 1108 when REF2 is active.When par. 4232 = PID2 OUTPUT, the maximum trimming reference is defined by parameter2008 value.Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
