C5: Automatic Speed Regulator (Asr) - YASKAWA T1000V Technical Manual

5.3 C: Tuning
Adjustment
Although C4-02 rarely needs to be changed, adjustments may help in the following situations:
• If the motor vibrates, increase C4-02.
• If the motor responds too slowly to changes in the load, decrease C4-02.
C4-03: Torque Compensation at Forward Start (OLV only)
■
Sets the amount of torque at start in the forward direction in order to improve motor performance during start with heavy
load. Compensation is applied using the time constant set in parameter C4-05. A setting of 0.0% disables this feature.
No.
C4-03
C4-04: Torque Compensation at Reverse Start (OLV only)
■
Sets the amount of torque reference at start in the reverse direction in order to improve motor performance during start
with heavy load. Compensation is applied using the time constant set in parameter C4-05. A setting of 0.0% disables this
feature.
No.
C4-04
C4-05: Torque Compensation Time Constant (OLV only)
■
This parameter is the time constant for applying the torque compensation at start set in parameters C4-03 and C4-04.
No.
C4-05
C4-06: Torque Compensation Primary Delay Time 2 (OLV only)
■
This time constant is used during Speed Search or during regenerative operation when the actual motor slip is higher than
50% of the rated slip. Adjust the value if an overvoltage fault occurs with sudden changes in the load or at the end of
acceleration with high inertia load.
No.
C4-06
Note: 1. If C4-06 is set to a relatively large value, be sure to also increase the setting in n2-03 (AFR Time Constant 2) proportionally.
2. C4-06 will not be active if L3-04 is 0, 3 or 4, the output frequency is below 5 Hz, or Speed Search after momentary power loss is
active.

◆ C5: Automatic Speed Regulator (ASR)

The ASR is a PI controller that adjusts the output frequency in order to compensate the motor slip when load is applied.
It is active only when V/f Control is used in combination with a speed feedback signal connected to the drive pulse input
RP (V/f Control with Simple Speed Feedback).
The pulse input provides one track only and can not detect the direction of motor rotation. A separate motor speed
direction signal must therefore be input to the ASR by:
1. Using a Digital Input
This method is automatically enabled when a digital input is programmed for "Forward/Reverse direction" (H1-
7E). If the input is closed, the drive assumes reverse rotation. If open, then the drive assumes that the motor is rotating
forwards.
When a 2 track encoder is used, an external unit that converts the 2 tracks into 1 track and a digital direction signal can
be used.
2. Using the Frequency Reference Direction
When no digital input is set for "Forward/Reverse direction" (H1-
reference.
138
Parameter Name
Torque Compensation at Forward Start
Parameter Name
Torque Compensation at Reverse Start
Parameter Name
Torque Compensation Time Constant
Parameter Name
Torque Compensation Primary Delay Time 2
≠ 7E), ASR uses the direction of the frequency
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Setting Range
0.0 to 200.0%
Setting Range
-200.0 to 0.0%
Setting Range
0 to 200 ms
Setting Range
0 to 10000 ms
Default
0.0%
Default
0.0%
Default
10 ms
Default
150 ms
=