Hitachi NB616X instruction manual Speed control P/PI switching function

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Chapter 7 FUNCTIONS

7.4 Speed control (P/PI) switching function

Relation

Speed control mode is normally controlled by proportional-

A044: 1st Control Method

P052: 1st Proportional gain

integration compensation (Pi), which keeps the deviation between

C001-C008: Intelligent input terminal

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

100%

0

P control

PI control

(A)

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 SafetyRevision History Table Page Page Contents Warranty of the unit Inquiry and Warranty of the UnitInspection upon packing Request upon inquiryOutline of SJ-FB How to Mount the option Board Outlook of SJ-FB Terminal assignment of the Option BoardSAP Function Explanation of the TerminalDSE Terminal connection diagramIf they Feed-back board initial setting Position of the setting switchMotor Setting 21 position of specification Switch setting flowchart Setting flowchart of the switch on the boardOperation Set Motor constant J bigger and bigger H024/H034 Function outline Orientation functionFunctions When the motor is unstable Decrease position loop gain Data settingData setting related to speed control Data setting of the input-output terminal Control mode settingSpeed control ASR Position control APR Electronic gear functionData setting related to position control Wiring for Synchronized OperationPositioning completion Set ‘23’ to one Control block diagram of the electron gear function Forward pulse train + Reversion pulse train mode Pulse train mode selectionForward/Reverse command + pulse train mode Speed control mode is normally controlled by proportional Speed control P/PI switching functionResistor vs. Temperature Curves Cause and countermeasure of the option error Action selection in case of option errorProduct specification
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