SV-iS7 User Manual - Inverter Drive Supermarket

1) Speed Command Loss
Chapter 10 Protective Functions
If the speed is set by analog input from the terminal block, communication option or the keypad, the action of the inverter can be
selected when the speed command is lost due to severance of the signal line and so on.
Group Code No. Function Display Setting Display Setting Range Unit
PRT
12 Lost Cmd Mode 1 Free-Run - -
13 Lost Cmd Time - 1.0 0.1~120 Sec
14 Lost Preset F - 0.00 Starting Freq~Max. Freq Hz
15 AI Lost Level 1 Half of X1 - -
OUT 31~33 Relay1,2, Q1 13 Lost Command - -
PRT-12 Lost Cmd Mode : Selects the action of the inverter in case of speed command loss.
Setting Items Functions
0 None
The speed command is directly operating frequency without protective
actions.
1 Free-Run The inverter blocks output with the motor in free run.
2 Dec Decelerating stop for the time set at PRT-07
3 Hold Input
Continues to operate at the average value of the input for the last 10 seconds
until the moment that the speed command loss was detected.
4 Hold Output
Continues to operate at the average value of the output for the last 10
seconds until the moment that the speed command loss was detected.
5 Lost Preset Operates at the frequency set at PRT-14 Lost Preset F.
PRT-15 AI Lost Level, PRT-13 Lost Cmd Time : sets the criterion voltage of speed command loss and judgment
time for analog input.
1 : Half of X1
If the input signals remain the same for the time set at PRT-13 Lost Cmd Time(speed loss judgment time) with them being a half of
the minimum set value of the analog input set as the speed command(DRV-07 Freq Ref Src), the protective action begins. The
standard value is what is set at IN-08, IN-12, IN-23 of the terminal block input group. For example, if the speed command is set as
No. 2 V1 at DRV-07 Freq Ref Src and IN-06 V1 Polarity is set as No. 0 Unipolar, the protective action starts when the voltage input
is below a half of the value set at , IN-08 V1 Volt x1.
2 : Below X1
If a signal lower than the minimum set vale of the analog input set as the speed command continues for the time set in PRT-13
Lost Cmd Time(speed loss judgment time), the protective action starts. The standard values are IN-08, IN-12 and IN-23 of the
terminal block input group.
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