Yaskawa F7 Drive Technical Manual Orientation - Manual (Page 12)

Date: 03/03/06, Rev: 06-03 Page 12 of 16 TM.F7SW.063
6.0 Application Details
6.1 Application Examples
Examples of Machine Configurations Used for Orientation
These examples show typical applications. In these examples, the encoder marker pulse is used for
orientation. An external switch may be used as a substitute for the marker pulse.
6.1.1 Example 1: Closed Loop
This is a direct drive system where the encoder, motor and spindle shafts are directly coupled. This
system can use the motor’s encoder for orientation and closed loop vector control (A1-02 = 3) of the
motor to provide the best performance.
6.1.2 Example 2: Open Loop
This is an indirect drive system where the driven motor and the oriented shaft are connected through a
drive train. The motor and oriented shaft must have a fixed ratio between them. The ratio must be able
to be entered into the drive using the provided ratio parameters (P2-05, P2-06, P2-07). The orientation
encoder is coupled to the oriented shaft. Since there is no motor encoder, the drive must be set to V/F or
open loop vector control (A1-02 = 0 or 2). This configuration will not provide the performance of a closed
loop system and may have issues finding and holding the orient position as true zero speed control is not
available.
6.1.3 Example 3: Closed Loop With Orientation Encoder
This is an indirect drive system where the motor and the spindle shaft are connected through a drive
train. The motor and spindle speeds must have a constant ratio between them. The ratio must be
entered into the drive using the provided ratio parameters. The position encoder is coupled to the spindle
shaft. The motor encoder allows for closed loop vector control. This method will provide the best indirect
positioning performance.
F7
Motor
En
co
d
e
r
Drivetrain
En
co
d
e
r
Motor
Drivetrain
En
co
d
e
r
Motor
En
co
d
e
r
(Gear Ratio) (Gear Ratio)
Example 1: Closed Loop Example 2: Open Loop Example 3: Closed Loop With Orientation
Encoder
F7 F7
Orientated Machine
Part
Orientated Machine
Part
Orientated Machine
Part
PG-X2 PG-X2 PG-W2