Toshiba TOSVERT VF-A7 Manual page 9

4.1.3. Operation with F330=3, 5, 8 or 10 (preset-speed mode)
When light-load high-speed operation selection F330=3, 5, 8 or 10 (preset-speed mode) is set, a light-load
detection internally turns ON the preset-speed command 4. Therefore, during light-load detection, operation shall
be performed with the preset-speed frequencies of 8~15. At this time, the input terminal S4 can independently be
used as a normal function-assigned terminal.
Because of the directed speed value being the input preset-speed command, high-speed operation will be stopped
if the input preset-speed operation frequency is set to less than light-load high-speed operation switching lower limit
frequency (F331).
F330=3 or 8 : Continuous preset-speed mode
F330=5 or 10 : Enabled-terminal effective preset-speed mode
F330=5 or 10 is the setting of 3 plus the enabling signal of light-load high-speed operation function.
The following example of F330=5 or 10 indicates the enabling signal assigned to S4 terminal:
Correspondence between preset-speed number and light-load high-speed operation is as
shown below:
S3
0
0
0
0
1
1
1
1
Note 1 : Frequency selected according to the speed command selection priority 1 (FMOD)
Note 2 : Light-load detection is effective when the selected frequency and preset-speed
Preset-speed
command 4
Light-load
detection
C C
S2 S1
Selected frequency
0 0
0 1 Preset-speed 1
1 0 Preset-speed 2
1 1 Preset-speed 3
0 0 Preset-speed 4
0 1 Preset-speed 5
1 0 Preset-speed 6
1 1 Preset-speed 7
frequencies of 1~7 are light-load high-speed operation switching lower frequency
(F331) or higher.
In case of selecting light-load high-speed operation enabling signal (120) for S4 (F118)
S4
S3
S2
S1
F
C C
Light-load detection (note 2)
OFF
Preset-speed 8
(note 1)
Preset-speed 9
Preset-speed 10
Preset-speed 11
Preset-speed 12
Preset-speed 13
Preset-speed 14
Preset-speed 15
Light-load high-speed
enabling signal
8
E6581172①
ON