Winding Selection Methods; M Code Winding Selection Method - YASKAWA VS-626M5 Instruction Manual

Wide Constant Power Control Using Winding Selection

7.5.1 M Code Winding Selection Method

7.5 Winding Selection Methods

7.5.1 M Code Winding Selection Method
7
When performing winding selection, design the reference circuits referring to the following three methods, to
make sufficient use of the motor characteristics.
For the main shaft drive of the machine-tool, view the winding selection as an electric gear, and use the
numeric control M codes (M41: Low-speed winding, M42: High-speed winding) as shown in the flow-
chart and timing chart below.
Start
M42
Low speed to
high speed
YES
NO
S reference ≥ K X S
YES
Speed reference = S
Does speed agree (AGR)?
YES
Winding selection
(CHW turns OFF.)
Switching completed
(CHWE)?
YES
S reference
Speed reference =
End
* 1. Operations within the dotted lines are Inverter internal signal processes.
* 2. M41: Low-speed winding selection
M42: High-speed winding selection
S reference: Main shaft rotation speed reference (main shaft)
S : Winding selection speed (Motor)
CHW
(In the diagram, S ≥ S
BH
K: Gearbox ratio (When main shaft is traveling at 4,000 min
if the Motor is operating at 5,000 min
Speed reference: Motor speed reference.
The relationship between the speed reference and S reference for M41
and M42 is shown in the diagram on the right.
Fig 7.4 Flowchart
NO
CHW
NO
CHW
NO
NO
K
≤ S )
CHW ML
−1
, K = 0.8.)
7 -6
M41
NO
High speed to
low speed
YES
S reference < K X S
CHW
YES
S reference
Speed reference =
K
NO
Does speed agree (AGR)?
YES
Winding selection
(CHW turns ON.)
NO
Switching completed
(CHWE)?
YES
1.0
S
CHW
−1
,
0
S reference
M42
M41
1.0