LS ELECTRIC SV-iS7 Series, User Manual

Page: 356 / 491

Using Protection Features
339
Code Description
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 Time). For example, set the speed
command to “2 (V1)” at DRV-07, and set IN-06 (V1
Po larity) 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.
1 Below of
x1
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 PRT-13 (Lost Cmd
Time). Codes IN-08 and IN-12 are used to set the
standard values.
PRT-14 Lost Preset F
In situations where speed commands are lost, set the operation mode
(PRT-
12 Lost Cmd Mode) to “5 (Lost Preset)” . This operates the protection
function and sets the frequency so that the operation can continue.
Set IN-06 (V1 Polari ty) to “Unipolar” and IN - 08 to “5 (V)” . Set PRT- 15 (AI Lost Level) to “ 1 (Below
x1)” and PRT - 12 (Lost Cmd Mode) to “2 (Dec)” and then set PRT-13 (Lost Cmd Time) to 5 seconds.
Then the inverter operates as follows:
Note
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 PRT-
13 (Lost Cmd Time) is elapsed.