6.2.4 Speed Command Loss
When setting operation speed using an analog input at the terminal block,
communication options, or the keypad, 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.
Motion at speed command
loss
Time to determine speed
command loss
Operation frequency at speed
command loss
Start
frequency–
Max.
frequency
Analog input loss decision
level
Multi-function relay 1 item
Multi-function relay 2 item
Speed Command Loss Setting Details
In situations when speed commands are lost, the inverter can be
configured to operate in a specific mode.
The speed command immediately becomes
the operation frequency without any protection
function.
The inverter blocks output. The motor
performs in free-run condition.
The motor decelerates and then stops at the
time set at Pr.07 (Trip Dec Time).
The inverter calculates the average input
value for 10 seconds before the loss of the
speed command and uses it as the speed
reference.
The inverter calculates the average output
value for 10 seconds before the loss of the
speed command and uses it as the speed
reference.
The inverter operates at the frequency set at