YASKAWA CIPR-GA50C series Technical Manual page 472

12.2 A: Initialization Parameters
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 do DC Inject Braking at Stop.
Dwell Function at Start
Adjustment Parameter
b6-01
b6-02
H2-xx = 5
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 or Open Loop Vector Control, 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 75% (V/f Control, Open Loop Vector Control)
–b2-03 [DC Inject Braking Time at Start] recommended setting: 0.2 s to 0.5 s
DC Injection Braking at Stop Function
Note:
If you disconnect a drive from a motor when it is controlling the motor or during DC Injection Braking (Zero speed level), a voltage
surge can trigger a drive fault. When you use an electromagnetic contactor between the drive and motor, set L8-07 = 1 or 2 [Output
Phase Loss Protection Sel = Fault when One Phase is Lost, Fault when Two Phases are Lost]. If it necessary to disconnect the motor
and drive when you stop the elevator, fully close the holding brake and disconnect the drive while the Baseblock signal is ON. This does
not apply for emergency conditions.
Adjustment Parameter
b2-01
b2-02
b2-04
H2-xx = 5
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Dwell Reference at Start
Dwell Time at Start
Frequency Detection 2
Figure 12.5 Dwell Function at Start
DC Injection/Zero SpeedThreshold
DC Injection Braking Current
DC Inject Braking Time at Stop
Frequency Detection 2
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YASKAWA SIEPC71061753A GA500 Technical Manual