LSIS 6731001500, User Manual

Page: 348 / 659

335
Learning Protection Features
Speed Command Loss Setting Details
Code Description
PRT-11 Lost KPD
Mode
Set the operation command source to keypad. If there is a communication error
with the keypad or connection problem between the keypad and the inverter,
select the inverter’s operation.
Setting Function
0 None
The speed command immediately becomes the
operation frequency without any protection function.
1 Warning
Select 24: Lost keypad from OUT-31–36, one of the multi
function terminal blocks, outputs a relevant warning
signal when abnormal operating conditions arise.
2 Free-Run
The inverter blocks output. The motor performs in free-
run condition.
3 Dec
The motor decelerates and then stops at the time set at
PRT-07 (Trip Dec Time).
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 Lst 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 protective
operation starts when the input signal is reduced to half
of the initial value of the analog input set using the
speed command (DRV-01) and it continues for the time
(speed loss decision time) set at PRT-13 (Lost Cmd