Chapter 4 Running and Commissioning IS620P User Manual
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2. Reference ramp parameter setting
The ramp control function is to change the speed references with large difference to
smoother speed references with constant acceleration and deceleration, that is, controlling
acceleration and deceleration by setting the acceleration and deceleration time. If the set
speed references change greatly, the motor may jitter or vibrate greatly. In this case, the soft
start acceleration and deceleration time can implement smooth running of the motor and
prevent vibration and damage to the mechanical parts.
The related function codes are set in the following table.
Function
Code
Parameter Name
Setting
Range
Unit Default
Effective
Time
Property
Control
Mode
H06 05
Acceleration ramp
time of speed
reference
0-65535 ms 0 Immediate
During
running
S
H06 06
Deceleration ramp
time of speed
reference
0-65535 ms 0 Immediate
During
running
S
The ramp control function converts the stepped speed references to smooth speed
references with constant acceleration/deceleration, implementing smooth speed control
(including internally set speed reference).
Figure 4-9 Ramp control diagram
Stepped speed
reference
After ramp control
1000 RPM
H06-05
H06-06
•
H06-05 species the time constant for the speed reference to accelerate from zero to
1000 RPM.
•
H06-06 species the time constant for the speed reference to decelerate from1000 RPM
to zero.
The formulas of calculating the actual acceleration and deceleration time are as follows:
•
Actual acceleration time = (Speed reference/1000) x Acceleration ramp time constant of
speed reference
•
Actual deceleration time = (Speed reference/1000) x Deceleration ramp time constant of
speed reference
Figure 4-10 Acceleration/Deceleration time diagram
Actual
deceleration time
Actual
acceleration time
1000 RPM
Set motor speed
Acceleration ramp time
constant (H06-05)
Deceleration ramp time
constant (H06-06)
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