Hitachi SJ-FB manual Speed control P/PI switching function, Torque characteristic P/PI

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P052: 1st Proportional gain

A044: 1st Control Method

Relation

Chapter 7 FUNCTIONS

7.4 Speed control (P/PI) switching function

Speed control mode is normally controlled by proportional-integration compensation (Pi), which keeps the deviation between the actual speed and speed command becomes 0. Further, you can also achieve a propotional control function, which can be used as drooping operation (i.e. one load with several inverters) with this option card.

Set P/PI switching function to one of the intelligent input terminal 1∼8 by the operator to achieve this function. (Input ‘43’ in one of C001∼C008.) When this is turned on, control mode becomes proportion control (P).

Please set proportional gain(Kpp ; a value used to decide the speed change rate) to H052 by a digital operator. The relationship between the Kpp value and the speed change rate is shown below.

10

(Speed Change Rate) = (Kpp Set Value) (%)

Relationship between Kpp Value and Speed Change Rate

Torque

P control

PI control

100 %

(A)

0	Rotation Speed

Figure 7-6 Torque characteristic (P/PI)

Speed Error at Rated Torque (A)

(Speed Change Rate) = Synchronous speed base frequency

Relationship between Speed Change Rate and Rated Rotation Speed

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Contents SJ-FB Feed-Back Board Definitions and Symbols SafetyPage Revision History Table P l a c e me n t . B e f o r e Page Contents Inspection upon unpacking Inquiries and WarrantyWarranty Warranty period of the board is shown belowLocal Hitachi Distributor Function Outline of SJ-FBHow to Mount the SJ-FB Board Outlook of SJ-FB Terminal Assignments of the SJ-FB BoardSAP Function Explanation of the TerminalsTerminal Connections Terminal wiringEAP EAN EBP EBN EZP EZN Switch Initial Settings Setting the DIP SwitchesInverter Configuration Parameters for the SJ-FB Board Gain Setting P001 Option 21 location of specification labels Switch setting flowchart Setting Flowchart for the DIP SwitchesOperation Operation Function outline Orientation functionFW/RV Data setting related to speed control Data settingFeed back board of the inverter main body Position control APR Electronic gear function Control mode settingData setting of the input-output terminal Speed control ASRData setting related to position control Wiring for Synchronized Operation Stat Control block diagram of the electron gear function Setting exampleForward/Reverse command + pulse train mode Pulse train mode selectionForward pulse train + Reversion pulse train mode Torque characteristic P/PI Speed control P/PI switching functionThat shows it below. This thermistor is the characteristic To restrain the speed fluctuation by the temperature changeCauses and Countermeasures for Option Board Errors Action selection in case of option errorProtection Function N t r o l Product specification