FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

Special operation and frequency control(5) PID control automatic switchover control (Pr. 127)⋅ The inverter can be started up without PID control mode only at a start.⋅ When the frequency is set to Pr. 127 PID control automatic switchover frequency within the range 0 to 400Hz, thesystem starts up without PID operation from a start until Pr. 127 is reached, and then it shifts to PID controloperation mode. Once the system has entered PID control operation, it continues PID control if the outputfrequency falls to or below Pr. 127.Output frequencyWithoutPIDoperationPID controlPr.127TimeSTFPID(6) PID output suspension function (SLEEP function) (SLEEP signal, Pr. 575 to Pr. 577 )⋅ The inverter stops operation if the output frequency after PID operation remains at less than the Pr. 576 Outputinterruption detection level setting for longer than the time set in Pr. 575 Output interruption detection time. This functioncan reduce energy consumption in the low-efficiency, low-speed range.⋅ When the deviation (= set value - measured value) reaches the PID output shutoff cancel level (Pr. 577 setting -1000%) while the PID output interruption function is on, the PID output interruption function is canceled and PIDcontrol operation is resumed automatically.⋅ While the PID output interruption function is on, the PID output interruption signal (SLEEP) is output. At this time,the inverter running signal (RUN) is off and the PID control operating signal (PID) is on.Reverse action (Pr.128 10)DeviationPr.577 - 1000%CancellevelOutput frequencyPr.576Less than Pr. 575Pr. 575 or moreSLEEP periodTimeRUNOFF(7) PID monitor function⋅ The PID control set point, measured value and deviation value can be displayed on the operation panel and outputfrom terminal FM, AM.⋅ The deviation monitor can display a negative value on the assumption that 1000 is 0%. (The deviation monitorcannot be output from the terminal FM, AM.)⋅ For the monitors, set the following values in Pr. 52 DU/PU main display data selection, Pr. 54 FM terminal functionselection, and Pr. 158 AM terminal function selection.SettingPIDSLEEPMonitor DescriptionMinimumIncrementsTerminal FM,AM Full ScaleRemarks52 PID set point 0.1% 100% For deviation input (Pr. 128 = 10, 11), the monitor53 PID measurement value 0.1% 100% value is always displayed as 0.54 PID deviation value 0.1% ⎯ONValue cannot be set to Pr. 54 or Pr. 158.The PID deviation value of 0% is displayed as 1000.334