YASKAWA GA700 Series Technical Manual page 637

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 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
DC Injection Braking at Stop, Zero Speed Control Function
Note:
If you disconnect a drive when it is controlling the motor or during DC Injection Braking (Zero speed level), a voltage surge can trigger
a 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 during baseblock (that is, while the baseblock signal is ON). This does
not apply for emergency conditions.
Adjustment Parameter
b2-01
b2-02
b2-04
H2-xx = 5
Figure 12.7 DC Injection Braking at Stop, Zero Speed Control Function
Note:
• If the mechanical operation of the holding brake is slow, use DC Injection Braking (zero speed control when set to closed loop vector)
until the brake is fully closed to prevent rollback.
• If you cannot hold the load with DC Injection Braking when it is stopped in V/f Control and Open Loop Vector Control modes, use
Dwell Function at Stop.
–b6-03 [Dwell Reference at Stop]: Minimum output frequency to 3.0 Hz
When Frequency Detection 2 is OFF, it is less than L4-01 [Speed Agree Detection Level] - L4-02 [Speed Agree Detection Width].
–b6-04 [Dwell Time at Stop] recommended setting: 0.3 s to 0.5 s
–b2-04 [DC Inject Braking Time at Stop] recommended setting: 0.0 s
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Dwell Reference at Start
Dwell Time at Start
Frequency Detection 2
Figure 12.6 Dwell Function at Start
DC Injection/Zero SpeedThreshold
DC Injection Braking Current
DC Inject Braking Time at Stop
Frequency Detection 2
12.2 A: Initialization Parameters
Name
Name
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