YASKAWA A1000 Technical Manual page 265

Setting 3: Speed feedback (V/f Control with Simple Speed Feedback)
This setting can be used in V/f control to increase the speed control precision by using a motor speed feedback signal.
The drive reads the speed feedback from terminal RP, compares it to the frequency reference and compensates the motor
slip using a speed regulator (ASR, setup in the C5- parameters) like shown in
RP is incapable of detecting motor direction, a separate way of determining motor direction still needs to be set up:
1.
Using a Digital Input
If a digital input programmed for "Forward/reverse detection" (H1- = 7E) is closed, the drive assumes
reverse rotation. If open, then the drive assumes that the motor is rotating forwards.
2.
Using the Frequency Reference Direction
If no digital input is set to "Forward/reverse detection" (H1- = 7E), the drive uses the direction of the
frequency reference as the direction for the speed feedback detected at the pulse input.
Figure 5.88
Figure 5.88 Speed Control with ASR in V/f with Simple Speed Feedback
Enabling V/f Control with Simple Speed Feedback:
1.
Set the drive to V/f Control (A1-02 = 0).
2.
Connect the motor speed pulse signal to the pulse input RP, set H6-01 = 3, and set the pulse signal frequency
that is equal to the maximum speed to H6-02 (pulse input scaling). Make sure the pulse input bias (H6-04) is 0%
and the gain (H6-03) is 100%.
3.
Decide the signal used for detecting the direction. If a digital input is used, set H1- = 7E.
4.
Use the ASR gain and integral time parameters described in
page 190 for adjusting the responsiveness.
Note: 1. C5 parameters will appear when using V/f Control (A1-02 = 0) and when the pulse input RP function is set for simple PG feedback in
V/f Control (H6-01 = 3).
2. If running two motors from the same drive, note that the V/f Control with simple PG feedback can be used for motor 1 only.

H6-02: Pulse Train Input Scaling
This parameter sets the pulse signal frequency that is equal to 100% of the input value selected in parameter H6-01.
No.
H6-02

H6-03: Pulse Train Input Gain
Sets the level of the input value selected in H6-01 when a pulse train signal with the frequency set in H6-02 is input to
terminal RP.
No.
H6-03
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Motor speed
Name
Pulse Train Input Scaling
Name
Pulse Train Input Gain
5.7 H: Terminal Functions
Figure 5.85. Because input terminal
C5: Automatic Speed Regulator (ASR) on
Setting Range
100 to 32000 Hz
Setting Range
0.0 to 1000.0%
5
Default
1440 Hz
Default
100.0%
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