Learning Protection Features
Reference frequency Loss Setting Details
The inverter responds to the Speed Reference Loss based on
the setting of Pr.12 (Lost Command Mode).
The speed refernce becomes the operating
frequency without any protection function.
The inverter blocks output. The motor coasts to a
stop.
The motor decelerates and stops based on 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 reference
and uses it as the speed reference.
The inverter calculates the average output
frequency for 10 seconds before the loss of the
speed reference and runs at that speed.
The inverter operates at the frequency set at Pr.14
(Lost Preset F).
Pr.15 AI Lost Level,
Pr.13 Lst Cmd Time
Configure the voltage level and time delay for speed
reference loss when using an analog input.
Based on the values set at In.08 and In.12,
protective operation starts when the input signal
is reduced to half of the initial value of the analog
input set using the speed reference (Frq code in
Operations group) and it continues for the time
(speed loss decision time) set at Pr.13 (Lost Cmd
Time). For example, set the reference frequency to
2 (V1) at the Frq code, and In.06 (V1 Polarity) to 0
(Unipolar). When the voltage input drops to less
than half of the value set at In.08 (V1 Volt x 1), the
protective function is activated.
The protective operation starts when the signal
becomes smaller than the initial value of the
analog input set by the speed reference and it
continues for the speed loss decision time set at
Pr.13 (Lost Cmd Time). Codes In.08 and In.12 are
used to set the standard values.
To run at a fixed speed, set the operation mode Pr.12 (Lost
Cmd Mode) to 5 (Lost Preset). When the protection function
operates, this sets the frequency for continued operation.
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