YASKAWA VS-626M5 Instruction Manual page 132

S500
OFF
[SDET]
ON
OFF
[CHW]
ON
OFF
[CHWE]
ON
500 min
Speed reference 0
Speed 0
Fig 7.7 Timing Chart
Using Speed Reference and the Inverter Speed Detection Signal
J
This method performs winding selection by judging whether the speed reference and actual motor speed
are within the high-speed winding selection range or the low-speed winding selection range, using the
speed reference and the Inverter speed detection signal (SDET). (Refer to the table below.) Compared with
the changing method that uses only the speed detection signal, signal processing is increased, but the fre-
quency of magnetic contactor changing can be reduced. The flowchart and timing chart are shown below.
Start
Speed reference ≥
S
CHW
NO
Is SDET OFF?
Select high-speed winding.
(CHW turns OFF.)
Winding selction
completed (CHWE)?
End
* Operations within the dotted lines are Inverter internal signal processes.
Fig 7.8 Flowchart
S2000
2000 min
−1
S
nS
NO
+ nS
YES
YES
NO
NO
YES
7 -9
7.5 Winding Selection Methods
S500
−1
nS
CHW
Speed reference ≤
S − nS
CHW
YES
Is SDET ON?
YES
Select low-speed winding.
(CHW turns ON.)
Winding selection
completed (CHWE)?
YES
−1
500 min
NO
7
NO