YASKAWA GA700 - Page 692

11.2 A: Initialization Parameters
692 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
S-Curve Characteristics, Accel & Decel Time
Adjustment Parameter Name
C1-01, C1-03, C1-05, C1-07 Acceleration Time 1 to 4
C1-02, C1-04, C1-06, C1-08 Deceleration Time 1 to 4
C2-01 S-Curve Time @ Start of Accel
C2-02 S-Curve Time @ End of Accel
C2-03 S-Curve Time @ Start of Decel
C2-04 S-Curve Time @ End of Decel
Figure 11.5 S-curve Characteristics, Accel & Decel Time
Note:
• When decreased operation times are necessary for the application, for example with cranes and hoists, do not use S-curve characteristic
times.
• The default setting for C2-04 [S-Curve Time @ End of Decel] will be 0.00 seconds. The default setting for other S-curve characteristics
will be 0.20 seconds. Set the acceleration/deceleration times and S-curve characteristic time correctly for acceleration/deceleration start
up and end. The recommended setting of the S-curve characteristics time is 0.2 to 1.0 seconds.
• When you use the C1-11 [Accel/Decel Time Switchover Freq], you can switch the acceleration/deceleration rate automatically during
acceleration/deceleration. The default setting is disabled.
When the Output Frequency ≥ C1-11, operate at the acceleration and deceleration times set in C1-01 and C1-02
When the Output Frequency < C1-11, operate at the acceleration and deceleration times set in C1-07 and C1-08
• During low speed operation, if the Output Frequency < E1-09 [Minimum Output Frequency] in the S-Curve Time @ Start of Decel, the
drive will cancel the S-curve characteristics and will do DC Inject Braking at Stop (zero speed control).
Dwell Function at Start
Adjustment Parameter Name
b6-01 Dwell Reference at Start
b6-02 Dwell Time at Start
H2-xx = 5 Frequency Detection 2
Figure 11.6 Dwell Function at Start
Note:
• If the mechanical operation of the holding brake is slow, use the Dwell Function at Start to prevent brake grinding (friction). Accelerate
after the brake is fully open.
• When you use V/f Control and Open Loop Vector Control modes, set b6-01 [Dwell Reference at Start] > Frequency Detection 2
(brake open frequency).
• If the motor torque is not sufficient during start up, use the DC Inject Braking function to secure the motor current (torque) before you
start the motor.
–b2-02 [DC Injection Braking Current] recommended setting: 50% to 80% (V/f Control or Open Loop Vector Control)
–b2-03 [DC Inject Braking Time at Start] recommended setting: 0.2 s to 0.5 s