5.3 C: Tuning
166 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Switching Acceleration and Deceleration Times by Motor Selection
When switching between motor 1 and 2 using a digital input (H1-= 16), parameters C1-01 to C1-04 become accel/
decel time 1 and 2 for motor 1, while C1-05 to C1-08 become accel/decel time 1 and 2 for motor 2. Accel/decel times 1
and 2 can be switched for each motor using a digital inputs set to H1- = 7 like shown in Table 5.13.
Note: 1. The motor 2 selection function cannot be used when PM motor is used.
2. The digital input setting “Accel/Decel time 2 selection” (H1- = 1A) cannot be used together with motor 1/2 switching. Trying to
do so triggers an oPE03 error, indicating a contradictory multifunction input settings.
Table 5.13 Motor Switching and Accel/Decel Time Combinations
Switching Accel/Decel Times by a Frequency Level
The drive can switch between different acceleration and deceleration times automatically. The drive will switch from
accel/decel time 4 in C1-07 and C1-08 to the default accel/decel time in C1-01 and C1-02 (C1-05 and C1-06 for motor 2)
when the output frequency exceeds the frequency level set in parameter C1-11. When it falls below this level, the accel/
decel times are switched back. Figure 5.31 shows an operation example.
Note: Acceleration and deceleration times selected by digital inputs have priority over the automatic switching by the frequency level
set to C1-11. For example, if accel/decel time 2 is selected, the drive will use this time only and not switch from accel/decel time
4 to the selected one.
Figure 5. 31
Figure 5.31 Accel/Decel Time Switching Frequency
■ C1-11: Accel/Decel Time Switching Frequency
Sets the frequency at which the drive switches between accel/decel time settings. Refer to Switching Accel/Decel Times
by a Frequency Level on page 166.
Note: Setting C1-11 to 0.0 Hz disables this function.
■ C1-09: Fast Stop Time
Parameter C1-09 will set a special deceleration that is used when certain faults occur or that can be operated by closing a
digital input configured as H1- = 15 (N.O. input) or 17 (N.C. input). The input does not have to be closed
continuously, even a momentary closure will trigger the Fast Stop operation. Unlike standard deceleration, once the Fast
Stop operation is initiated, the drive cannot be restarted until the deceleration is complete, the Fast Stop input is cleared,
and the Run command is cycled.
A digital output programmed for “During Fast Stop” (H2- = 4C) will be closed as long as Fast Stop is active.
A Fast Stop can be selected as the action the drive should take when certain faults occur, such as L8-03 (Overheat Pre-
Alarm Operation Selection).
NOTICE: Rapid deceleration can trigger an overvoltage fault. When faulted, the drive output shuts off, and the motor coasts. To avoid
Accel/Decel Time 1 (H1- = 7)
Motor 1 Selected (Terminal set to H1-=16 OFF) Motor 2 Selected (Terminal set to H1-=16 ON)
Accel Decel Accel Decel
Open C1-01 C1-02 C1-05 C1-06
Closed C1-03 C1-04 C1-07 C1-08
No. Parameter Name Setting Range Default
C1-11 Accel/Decel Time Switching Frequency 0.0 to 400.0 Hz 0.0 Hz
No.
<1> The setting range for the acceleration and deceleration times is determined by the accel/decel time setting units in C1-10. For example, if the
time is set in units of 0.01 s (C1-10 = 0), the setting range becomes 0.00 to 600.00 s
Parameter Name Setting Range Default
C1-09 Fast Stop Time 0.0 to 6000.0 s <1> 10.0 s
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