YASKAWA VS-656MR5

Wide Constant Power Control Using Winding Selection
7.5.2 Automatic Winding Selection methods
7-8
7.5.2 Automatic Winding Selection methods
This section explains the automatic winding selection methods. There are two methods.
J
Using the Inverter Speed Detection Signal
The flowchart and timing chart for performing automatic winding selection judging from the actual motor
speed alone using the Inverter speed detection signal (SDET) are shown below.
Start
Motor speed ≥
S
CHW
+ nS
(SDET) OFF
Low-speed winding?
Select high-speed coil.
(CHW Turns OFF.)
Winding selection
completed
(CHWE)?
End
Motor speed ≤
S
CHW
− nS
(SDET) ON
High-speed winding?
Select low-speed winding
(CHW Turns ON.)
Winding selection
completed
(CHWE)?
YES
YES
YES
NO
NO
NO
YES
YES
YES
NO
NO
NO
* 1. Operations within the dotted lines are Inverter internal signal processes.
*2. S
CHW
: Winding selection speed (Motor) (Set using control constant C1-21 (SD
LVL
).)
∆S: Switching speed hysterisis width (Set using control constant C1-22 (SD
HYS
).)
Set S
CHW
and ∆S as shown below.
Within the diagram,
S
CHW
− ∆S ≧ S
BH
S
CHW
+ ∆S ≦ S
BH
S
CHW
S100 (C1-26)
× 100(%)
C1−21=
ΔS
S100 (C1-26)
× 100(%)
C1−22=
(Where ∆S = 100 to 200 min
−1
)
Refer to Chapter 5 Operating the Digital Operator for details on the setting methods.
Fig 7.6 Flowchart
7
−nS
S
CHW
(C1-21)
+nS
ON
OFF
[SDET]