Yaskawa Matrix Converter - Manual (Page 316)

Elevator and Hoist Type Applications
6-
151
‹ Reducing Shock at Start/Stop and during Acceleration/Deceleration
Adjust the following parameters when riding comfort is highly important during start, stop, acceleration, and
deceleration. These settings are often used for passenger elevators.
„ S-Curve Characteristics, Acceleration/Deceleration Times
„ Dwell Function at Start
If the mechanical operation of the holding brake is slow, use the Dwell function at start to prevent brake wear,
and accelerate after the brake is completely open.
IMPORTANT
1. The default for C2-04 (S-Curve characteristic at decel end) is 0.00 second, while the default for all other S-
curve characteristic times is 0.20 seconds. Make appropriate settings for the accel/decel times and S-curve
characteristic times at each point. (S-curve characteristic time = Approximately 0.2 to 1.0 second)
2. The accel/Decel rate can be automatically switched during acceleration and deceleration by using C1-11
(Accel/Decel Switch Frequency). (Default: Disabled.)
Output frequency
≥ set frequency: C1-01, C1-02 accel/decel times
Output frequency < set frequency: C1-07, C1-08 accel/decel times
3. If the output frequency during the S-curve characteristic time for deceleration falls below the value set for
E1-09 (Min. output frequency), the S-curve characteristic will be cancelled, and the DC injection braking
(Zero-speed control) will be applied.
4. Do not use the S-curve characteristic for applications where a short run time is desired, such as in cranes
and hoists. (S-curve characteristic time = Approximately 0.0 to 0.2 seconds)
IMPORTANT
1. When using Open Loop Vector Control or V/f Control, set b6-01 (Dwell frequency at start) higher than Fre-
quency Detection 2 (frequency when brakes open).
2. If the motor tends to have insufficient torque when started, use the DC Injection Braking function to allow
sufficient motor current (torque) before starting.
• b2-03 (DC Injection Braking Time/DC Excitation Time at Start): 0.2 to 0.5 s
• b2-02 (DC Injection Braking Current): 50% to 80% (Open Loop Vector Control, V/f Control Method only)
C2-03 C2-02
(High speed)
Output frequency
C2-03
C2-04
C2-04 C2-01
Acceleration time Deceleration time
(Low speed)
DC Injection Braking when stopping
(Zero-speed control for flux vector control)
b6-02
(Dwell time at Start)
0.1 to 0.3 sec
(High speed)
on off
CLOSE OPEN
t
Output frequency
b6-01 (Dwell Reference at Start) 0.1 to 3.0 Hz
Frequency detection
2 or During run 2
Holding brake
operation