Contents

•Switching Acceleration and Deceleration Time Using Multi-Function Input Terminal
Commands
When two digital input terminals are set for “Accel./Decel. time switch over 1 and 2” (H1-=7 and 1A), the
acceleration/deceleration times can be switched over even during operation by combining the ON/OFF status
of the terminals.
The following table shows the acceleration/deceleration time switching combinations.
Acceleration/Deceleration
Time Selection 1 Terminal
Acceleration/Deceleration
Time Selection 2 Terminal
Acceleration Time
Deceleration Time
OFF OFF C1-01 C1-02
ON OFF C1-03 C1-04
OFF ON C1-05 C1-06
ON ON C1-07 C1-08
•Automatic Deceleration Time Switch Over Using a Speed Level
The deceleration times C1-02 and C1-08 can be switched over automatically at a certain speed which can be
set in parameter C1-11. Fig 5.34 shows the working principle of the function.
Set C1-11 to a value other than 0.0 Hz. If C1-11 is set to 0.0 Hz, the function will be disabled.
Output
Frequency
Decel. time
Switching Freq.
C1-11
C1-01 C1-02 C1-08
When output frequency ≥ C1-11the deceleration time 1 (C1-02) is used.
When output frequency < C1-11the deceleration time 4 (C1-08) is used.
Fig 5.34 Acceleration/deceleration Time Switching Frequency
•Dwell at Start Function
This function can be used to have a low acceleration at start. The parameter S1-26 must be set to a certain
speed level (dwell speed) to activate the function.
When the inverter starts, the inverter accelerates to the S1-26 speed level using the acceleration time C1-07.
Once the motor speed exceeds the S1-26, the inverter will use the original acceleration time.
Internal RUN
Soft Starter
C1-07
S1-26
Motor speed
Brake release
Fig 5.35 Dwell at start function
5-18