12.3 C: Tuning
288 YASKAWA SIEPYEULA5001C LA500 Technical Manual
12.3 C: Tuning
C parameters adjust drive operation, including:
• Acceleration Time
• Deceleration Time
• Slip Compensation
• Torque Compensation
• Carrier Frequency
◆ C1: Accel & Decel Speed
You can set four different acceleration and deceleration time pairs in the drive. When you activate and deactivate
H1-xx = 7, 1A [MFDI Function Select = Accel/Decel Ramp Selection 1, Accel/Decel Time Selection 2], you can
switch acceleration and deceleration times during run.
Acceleration time parameters always set the time to accelerate from 0 Hz to E1-04 [Maximum Output Frequency].
Deceleration time parameters always set the time to decelerate from E1-04 to 0 Hz.
C1-01 [Acceleration Ramp 1] and C1-02 [Deceleration Ramp 1] are the default active accel/decel settings.
■ Use MFDIs to Switch Acceleration Ramps
Table 12.2 shows the different acceleration and deceleration times.
Table 12.2 Accel/Decel Ramps and Active Parameters
H1-xx = 7
[Accel/Decel Ramp Selection
1]
H1-xx = 1A
[Accel/Decel Ramp Selection
2]
Active Parameter
Acceleration Time Deceleration Time
OFF OFF C1-01 [Acceleration Ramp 1] C1-02 [Deceleration Ramp 1]
ON OFF C1-03 [Acceleration Ramp 2] C1-04 [Deceleration Ramp 2]
OFF ON C1-05 [Acceleration Ramp 3] C1-06 [Deceleration Ramp 3]
ON ON C1-07 [Acceleration Ramp 4] C1-08 [Deceleration Ramp 4]
Figure 12.3 shows an operation example to change acceleration and deceleration times. It is necessary to set b1-03
= 0 [Stopping Method Selection = Ramp to Stop] for this example.
Figure 12.3 Timing Diagram of Acceleration and Deceleration Times
■ Use Output Speed Level to Switch Acceleration and Deceleration Times
The drive can use output Speed to automatically switch between different acceleration and deceleration times.
When the output Speed = C1-11 [Accel/Decel Time Switching Speed], the drive automatically switches the
acceleration and deceleration times. Set C1-11 = 0.0% to disable this function.
Note:
• Acceleration and deceleration times set to MFDIs are more important than the automatic switch using the speed level set in C1-11. For
example, if you set the switchover speed to C1-11, the drive will not automatically switch acceleration and deceleration times when the
MFDI terminal set for Accel/Decel Speed Selection 1 [H1-xx = 7] is activated.
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