Automatic Winding Selection Methods - YASKAWA VS-626M5 Instruction Manual

Wide Constant Power Control Using Winding Selection

7.5.2 Automatic Winding Selection methods

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