Yaskawa VS-616G5 Series Revision F Programming Manual - Manual (Page 18)

V/f V/f w/PG Open Loop
Vector
Flux
Vector
18 VS-616G5 Programming Manual
B3 Speed Search
When starting into a coasting motor, use the speed search command or DC injection braking at start, to
prevent a drive trip and motor burnout.
This function allows the restart into a coasting motor without the necessity to stop. It is useful during
inverter bypass operation, when switching between the motor receiving power directly from the line
and from the inverter. Two interlocking contactors must be employed for commercial power switcho-
ver to prevent line power from being applied to the inverter output terminals.
Set the multi-function contact input selection (H1-01 to H1-06) to “61” (start search command from
maximum output frequency), “62” (start search command from the set frequency), or “64” (start
search command from the SFS frequency when baseblock is applied).
Note: This parameter is disabled except when (A1-02=1) (V/F w/PG Fdbk) or 3 (Flux Vector)
Setting Range: 0 to 200%
Factory Default: 150%
After power loss and recovery, speed search begins to ramp the frequency down from a specified point in
order to locate the frequency of the spinning motor. During initial speed search the inverter’s output cur-
rent exceeds the speed search detection current level. This level is set as a percentage of inverter rated
current. When the inverter’s output current is less than the speed search detection level, the frequency is
interpreted as the speed agree level, and the inverter accelerates/decelerates to the specified frequency.
Note: Factory setting defaults to 150 when A1-02=0 (V/F Control). When A1-02=2 (Open Loop Vec-
tor), the default is 100
.
B3-01 Speed Search after Run Command SpdSrch at Start A - A -
Setting Description
0 Speed search disabled, the motor accelerates to the set frequency from the
min. frequency reference after run command is given (factory default).
1 Speed search enabled after run command is given, according to multi-func-
tion contact input selection. When using an encoder, the motor accelerates/
decelerates to the set frequency from the motor speed.
B3-02 Speed Search Detection Current Level SpdSrch Current A - A -
Section B: Application Parameters
B3 Speed Search