Hitachi NES1-004SB Quick Reference Manual page 98

Ne-s1 series

Table of Contents

(2) Automatic torque boost

When automatic torque boost (data "01") is selected by the torque boost selection (A041/A241), the

inverter automatically adjusts the output frequency and voltage according to the load on the motor.

(During actual operation, the automatic torque boost is usually combined with the manual torque boost.)

When you select the automatic torque boost, adjust the settings of the motor capacity selection

(H003/H203) and motor pole selection (H004/H204) according to the motor to be driven.

If the inverter trips due to overcurrent during motor deceleration, set the AVR function select (A081) to

always enable the AVR function (data "00").

If you cannot obtain the desired operation characteristic by using the automatic torque boost, make the

following adjustments:

Symptom

Motor torque is insufficient at low

speed.

(The motor does not rotate at low

speed.)

The motor speed falls when a load

is applied to the motor.

The motor speed increases when a

load is applied to the motor.

The inverter trips due to overcurrent

when a load is applied to the motor.

7.5.3 3-wire interface operation function (STA, STP, and F/R)

The 3-wire interface operation function allows you to use automatic- reset contacts (e.g., pushbutton

switches) to start and stop the inverter.

Specify "01" (control circuit terminal block) for the run command source setting (A002).

Assign function "20" (STA), "21" (STP), and "22" (F/R) to three of the terminal [1] to [5] functions (C001 to

C005) to enable the control operations described below. Assigning the STP function to an intelligent input

terminal disables the functions of the FW and RV terminals.

While the (STP) is OFF , the (STA) is invalid.

Item

Terminal [1] to [5] functions

STA

STP

F/R

Output frequency

Adjustment method

(1) Increase the voltage setting for manual torque boost

step by step.

(2) Increase the slippage compensation gain for