Learning Protection Features
protective operation starts when the input signal is
reduced to half of the initial value of the analog
input set using the speed command (Frq code of
Operation group) and it continues for the time
(speed loss decision time) set at Pr. 13 (Lost Cmd
Time). For example, set the speed command to 2
(V1) at the Frq code in the Operation group, 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 command 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
In situations where speed commands are lost, set the operation mode (Pr.12
Lost Cmd Mode) to 5 (Lost Preset). This operates the protection function and
sets the frequency so that the operation can continue.
Set Pr.15 (Al Lost Level) to 1 (Below x 1), Pr.12 (Lost Cmd Mode) to 2 (Dec), and Pr.13 (Lost Cmd
Time) to 5 sec. Then it operates as follows:
If speed command is lost while using communication options or the integrated RS-485
communication, the protection function operates after the command loss decision time set at Pr.13
(Lost Cmd Time) is passed.
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