Pr. 22, 23, 48, 49, 66, 148, 149, 154, 156, 157

Stall prevention operation

Pr.22 Stall prevention operation level

Pr.23 Stall prevention operation level compensation factor at double speed

Pr.48 Second stall prevention operation current

Pr.49 Second stall prevention operation frequency

Pr.66 Stall prevention operation reduction starting frequency

Pr.148 Stall prevention level at 0V input.

Pr.149 Stall prevention level at 10V input.

Pr.154 Voltage reduction selection during stall prevention operation

Pr.156 Stall prevention operation selection

Pr.157 OL signal output timer

This function monitors the output current and automatically changes the output frequency to prevent the inverter from coming to an alarm stop due to overcurrent, overvoltage, etc. It can also limit stall prevention and fast-response current limit operation during acceleration/deceleration, driving or regeneration.

￿ Stall prevention

If the output current exceeds the limit value, the output frequency

of the inverter is automatically varied to reduce the output current.

Also the second stall prevention function can restrict the output

frequency range in which the stall prevention function is valid.

(Pr.49)

￿ Fast-response current limit

If the current exceeds the limit value, the output of the inverter is

shut off to prevent an overcurrent.

￿ Set in Pr. 22 the ratio of the output current to the rated inverter

current at which stall prevention operation will be performed.

Normally set this parameter to120% (initial value).

￿ When “9999” is set in Pr. 22, stall prevention operation level can be

changed by the signal to the auxiliary input terminal (terminal 1). For

the adjustment of bias/gain of analog signal, use Pr. 148 and Pr. 149.

￿ During high-speed operation above the rated motor frequency,

acceleration may not be made because the motor current does

not increase. If operation is performed in a high frequency range,

the current at motor lockup becomes smaller than the rated output

current of the inverter, and the protective function (OL) is not

Pr. 49 Setting

Operation

0 (initial value)

Second stall prevention function is not activated

0.01Hz to 400Hz

If the output frequency is less than the frequency set in

Pr. 49, the second stall prevention operation function is

 

activated. (during constant speed or deceleration)

 

The second stall prevention function is performed according to

9999

the RT signal.

RT signal on ....... Stall level Pr. 48

 

 

RT signal off ....... Stall level Pr. 22

￿Stall prevention operation and fast response current restriction function can be restricted according to the operation condition using Pr. 156.

Pr. 24 to 27

 

 

Refer to the section about Pr.4 to Pr.6

 

 

Pr.

28

Input compensation of multi-

speed and remote setting

Pr.28 Multi-speed input compensation selection

By inputting the frequency setting compensation signal (terminal 1, 2), the speed (frequency) can be compensated for relative to the multi-speed setting or the speed setting by remote setting function.

Pr. 28 Setting

Definition

0 (initial value)

Without compensation

1

With compensation

Acceleration/ deceleration pattern

Pr. 29, 140 to 143 and back lash measures

Pr.29 Acceleration/deceleration pattern selection

Pr.140 Backlash acceleration stopping frequency

Pr.141 Backlash acceleration stopping time

Pr.142 Backlash deceleration stopping frequency

Pr.143 Backlash deceleration stopping time

 

You can set the acceleration/deceleration pattern suitable for application.

You can also set the backlash measures that stop acceleration/ deceleration once at the parameter-set frequency and time during acceleration/deceleration.

 

 

Features

 

 

 

 

 

 

 

 

Peripheral Devices

Why energy

savings?

 

 

 

 

 

 

 

Standard

Specifications

 

 

 

 

 

 

 

Outline

Dimension

Drawings

 

 

 

 

 

 

 

 

 

 

 

 

Terminal Connection

Diagram

Terminal Specification

Explanation

 

 

 

 

 

 

 

Operation

Panel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

List

 

 

 

 

 

 

 

 

 

 

 

 

 

Explanations

of

Parameters

executed if the motor is at a stop.

To improve the operating characteristics of the motor in this case,

the stall prevention level can be reduced in the high frequency

region. This function is effective for performing operation up to the

high speed region on a centrifugal separator etc. Normally, set

60Hz in Pr. 66 and 100% in Pr. 23.

￿ By setting "9999" (initial value) in Pr. 23 Stall prevention operation

level compensation factor at double speed, the stall prevention

operation level is constant at the Pr. 22 setting up to 400Hz.

Pr.22

 

 

Reduction ratio compensation

 

 

 

When Pr.23=9999

 

Stall prevention operation level (%)

 

Pr.23

factor (%)

 

400Hz

 

Pr.66

 

 

 

 

 

 

Output frequency (Hz)

￿Setting "9999" in Pr. 49 Second stall prevention operation frequency and turning the RT signal on make Pr. 48 Second stall prevention operation current valid.

￿The stall prevention operation level from 0Hz to the output frequency set in Pr. 49 can be set in Pr. 48.

Set frequency

exceeds Pr. 49

Set frequency is

Pr. 49 or less

Output

 

 

Output

 

 

 

frequency (Hz)

 

frequency (Hz)

Output

 

 

 

Set

 

frequency

 

Output

 

 

 

 

 

 

frequency

frequency

 

 

Pr.49

 

 

 

Pr.49

 

 

 

 

 

Set

 

 

 

 

 

 

 

 

frequency

 

Stall

 

Time

 

Time

 

 

 

prevention

 

 

 

 

level

Pr. 22

 

 

 

 

used

Pr. 48

Pr. 22

Pr. 48

 

 

used

used

 

 

used

 

 

 

 

Setting value "0"

Outputfrequency

[Linear acceleration

/ deceleration]

(Hz)

 

Time

Setting value "1"

frequency

[S-pattern acceleration

/deceleration A]

 

Output

fb

(Hz)

 

Time

Setting value "2"

 

 

[S-pattern acceleration

 

 

/deceleration B]

Set frequency

(Hz)

 

frequency

f1

 

 

 

Output

f2

 

(Hz)

Time

 

 

(Hz)

 

Setting value "3"

 

[Anti-backlash measure

frequency

function]

 

 

 

 

 

 

f2

Output

 

 

Pr.142

 

f1

 

 

 

 

 

 

Pr.140

 

 

t1

t2

Time

 

 

 

Pr.141

Pr.143

 

￿Linear acceleration/deceleration (setting "0", initial value)

When the frequency is changed for acceleration, deceleration, etc. in inverter operation, the output frequency is changed linearly (linear acceleration/deceleration) to reach the set frequency without straining the motor and inverter.

￿S-pattern acceleration/deceleration A (setting "1")

For machine tool spindle applications, etc.

Use when acceleration/deceleration must be made in a short time to a high-speed region of not lower than base frequency.

￿S-pattern acceleration/deceleration B (setting "2")

For prevention of load shifting in conveyor and other applications Since acceleration/deceleration is always made in an S shape from current frequency (f2) to target frequency (f1), this function eases shock produced at acceleration/ deceleration and is effective for load collapse prevention, etc.

￿Backlash measures (setting "3", Pr.140 to Pr.143 )

To avoid backlash, acceleration/ deceleration is temporarily stopped. Set the acceleration/deceleration stopping frequency and time in Pr. 140 to Pr. 143.

Protective

Functions

 

 

 

 

Options

 

 

 

 

Instructions

 

 

 

 

Motor

 

 

 

 

Compatibility

 

 

Warranty

 

 

 

 

Inquiry

 

 

Pr. indicates simple mode parameters and Pr. indicates extended parameters. When setting parameters, refer to the instruction manual (applied) and understand instructions.

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Mitsubishi Electronics FR-F700 Stall prevention operation, Input compensation of multi, Speed and remote setting