Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 51)

1.3 C: Tuning
C parameters set the characteristics for acceleration, deceleration, and S-curves. Other parameters in the C group cover settings
for slip compensation, torque compensation, and carrier frequency.
u C1: Acceleration and Deceleration Times
n C1-01 to C1-04: Accel, Decel Times 1 and 2
Four different sets of acceleration and deceleration times can be set in the drive by digital inputs, motor selection, or switched
automatically.
Acceleration time parameters always set the time to accelerate from 0 Hz to the maximum output frequency (E1-04).
Deceleration time parameters always set the time to decelerate from maximum output frequency to 0 Hz. C1-01 and C1-02
are the default active accel/decel settings.
No. Parameter Name Setting Range Default
C1-01 Acceleration Time 1
0.1 to 6000.0 s 30.0 s
C1-02 Deceleration Time 1
C1-03 Acceleration Time 2
C1-04 Deceleration Time 2
Switching Acceleration Times by Digital Input
Accel/decel times 1 are active by default if no input is set.
Table 1.12 Accel/Decel Time Selection by Digital Input
Accel/Decel Time Sel. 1
H1-oo = 7
Active Times
Acceleration Deceleration
0 C1-01 C1-02
1 C1-03 C1-04
Figure 1.19 shows an operation example for changing accel/decel. times. The example below requires that the stopping method
be set for “Ramp to stop” (b1-03 = 0).
Output
frequency
Accel Time 1
(C1-01)
Decel Time 1
(C1-02)
Accel Time 2
(C1-03)
Decel Time 2
(C1-04)
Decel Time 1
(C1-02)
FWD (REV)
Run command
ON OFF ON
ON
Accel/Decel Time Selection 1
(Terminals S1 to S7, H1-oo = “7”)
Figure 1.19 Timing Diagram of Accel/Decel Time Change
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 2 in C1-03 and C1-04 to the default accel/decel time in C1-01 and C1-02 when the output frequency exceeds the
frequency level set in parameter C1-11. When the frequency falls below this level, the accel/decel times are switched back.
Figure 1.20 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 only accel/decel time 2; it will not switch from accel/decel time 2 to the
selected time.
1.3 C: Tuning
YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual 51
1
Parameter Details