5.3 C: Tuning
146
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
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C4-03: Torque Compensation at Forward Start (OLV)
Sets the amount of torque at start in the forward direction in order to improve motor performance during start with a
heavy load. Compensation is applied using the time constant set in parameter C4-05. Enable this function when the load
pulls the motor in reverse when starting with a Forward run command. Setting of 0.0% disables this feature.
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C4-04: Torque Compensation at Reverse Start (OLV)
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. Enable this function if the load
pulls the motor in the forward direction when starting with a Reverse run command. Setting 0.0% disables this feature.
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C4-05: Torque Compensation Time Constant (OLV)
This parameter is the time constant for applying the torque compensation at start that is set to C4-03 and C4-04.
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C4-06: Torque Compensation Primary Delay Time 2 (OLV)
This time constant is used during Speed Search or during regenerative operation. Adjust the value if an overvoltage fault
occurs with sudden changes in the load or at the end of acceleration with high inertia load.
Note:
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.
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C4-07: Motor 2 Torque Compensation Gain
Functions for motor 2 in the same way that C4-01 functions for motor 1.
C3-01: Slip Compensation Gain on page 142
for details on adjusting this parameter.
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C5: Automatic Speed Regulator (ASR)
The ASR is used for controlling the motor speed in V/f w/PG, CLV, AOLV/PM, and CLV/PM control modes. It adjusts
the output frequency (V/f w/PG) or torque reference (CLV, AOLV/PM, CLV/PM) in order to minimize the difference
between frequency reference and actual motor speed.
The figures below illustrates how ASR works.
Figure 5.32
Figure 5.32 Speed Control Block Diagram for V/f Control with PG
No.
Parameter Name
Setting Range
Default
C4-03
Torque Compensation at Forward Start
0.0 to 200.0%
0.0%
No.
Parameter Name
Setting Range
Default
C4-04
Torque Compensation at Reverse Start
-200.0 to 0.0%
0.0%
No.
Parameter Name
Setting Range
Default
C4-05
Torque Compensation Time Constant
0 to 200 ms
10 ms
No.
Parameter Name
Setting Range
Default
C4-06
Torque Compensation Primary Delay Time 2
0 to 10000 ms
150 ms
No.
Parameter Name
Setting Range
Default
C4-07
Motor 2 Torque Compensation Gain
0.00 to 2.50
1.00
P
I
+
+
+
-
+
+
Output frequency
C5-01
C5-03
C5-02, C5-04
C5-05
Frequency
reference
Detected speed
Change
rate
limiter
ASR limit