Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 154)

C2-02
C2-01
0.20 s
<1>
0.20 s <1>
C2-02
C2-01
0.20 s <1>
0.20 s <1>
FWD run
REV run
Output
frequency
<1> S-Curve characteristic at Decel Start/End is fixed to 0.20 s.
Figure 5.14 S-Curve Timing Diagram - FWD/REV Operation
Setting the S-curve will increase the acceleration and deceleration times.
Actual accel time = accel time setting + (C2-01 + C2-02) / 2
u C4: Torque Compensation
The torque compensation function compensates for insufficient torque production at start-up or when a load is applied.
Note: Set the motor parameters and V/f pattern properly before setting torque compensation parameters.
n C4-01: Torque Compensation Gain
Sets the gain for the torque compensation function.
No. Parameter Name Setting Range Default
C4-01 Torque Compensation Gain 0.00 to 2.50 1.00
Torque Compensation:
The drive calculates the motor primary voltage loss using the output current and the termination resistor value (E2-05) and
adjusts the output voltage to compensate insufficient torque at start or when load is applied. The effects of this voltage
compensation can be increased or decreased using parameter C4-01.
Adjustment
Although this parameter rarely needs to be changed, it may be necessary to adjust the torque compensation gain in small steps
of 0.05 in the following situations:
• Increase this setting when using a long motor cable.
• Decrease this setting when motor oscillation occurs.
Adjust C4-01 so the output current does not exceed the drive rated current.
u C6: Carrier Frequency
n C6-02: Carrier Frequency Selection
Sets the switching frequency of the drive output transistors. Changes to the switching frequency lower audible noise and reduce
leakage current.
Note: Increasing the carrier frequency above the default value automatically lowers the drive current rating.
No. Parameter Name Setting Range Default
C6-02 Carrier Frequency Selection 1 to 4 Determined by o2-04
Setting 1: 4.0 kHz
Setting 2: 6.0 kHz
Setting 3: 8.0 kHz
Setting 4: 10.0 kHz
5.3 C: Tuning
154 YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual