LS ELECTRIC SV-iS7 Series, Руководство пользователя, Страница: 355 / 491

Using Protection Features
338
10.2.5 Speed Command Loss
When setting the operation speed using an analog input at the terminal block, communication
options, or the keypad, the speed command loss setting can be used to select the inverter
operation for situations when the speed command is lost due to the disconnection of signal
cables.
Group Code LCD Display Parameter Setting Setting Range Unit
PRT
12 Lost Cmd Mode 1 Free-Run - -
13 Lost Cmd Time - 1.0 0.0 – 120 Sec
14 Lost Preset F - 0.00 Starting Freq – Max. Freq Hz
15 AI Lost Level 1 Half of X1 - -
OUT 31 – 33 Relay1,2, Q1 13 Lost Command - -
Speed Command Loss Setting Details
Code Description
PRT-12 Lost Cmd
Mode
In situations when speed commands are lost, the inverter can be
configured to operate in a specific mode:
Setting Function
0 None The speed command immediately becomes the
operation frequency without any protection function.
1 Free-Run The inverter blocks output. The motor performs in
free-run condition.
2 Dec The motor decelerates and then stops at the time set
at PRT-07 (Trip Dec Time).
3 Hold Input The inverter calculates the average input value for 10
seconds before the loss of the speed command and
uses it as the speed reference.
4 Hold
Output
The inverter calculates the average output value for
10 seconds before the loss of the speed command
and uses it as the speed reference.
5 Lost Preset The inverter operates at the frequency set at PRT-14
(Lost Preset F).
PRT-15 AI Lost Level,
PRT-13 Lost Cmd
Time
Configure the voltage and decision time for speed command loss when
using analog input.
Setting Function
0 Half of x1 Based on the values set at IN-08 and IN-12, a