YASKAWA GA700 Technical Manual page 693

DC Injection Braking at Stop, Zero Speed Control Function
NOTICE: 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, as in Europe, fully close the holding brake and disconnect the drive during
baseblock (i.e., 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 11.7 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 - L4-02 [Speed Agree Detection Level - Speed Agree Detection Width].
–b6-04 [Dwell Time at Stop] suggested setting: 0.3 s to 0.5 s
–b2-04 [DC Inject Braking Time at Stop] suggested setting: 0.0 s
Torque Compensation (Torque Bias)
This function enters the torque compensation (torque bias) signal that matches a set load from the MFAI terminal
in Closed Loop Vector Control to decrease the overshoot when you open and close the brake. You must detect the
load and motoring/regeneration on the machine side before you use the function. If there is a polarity error, shock
can increase.
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
11.2 A: Initialization Parameters
Name
DC Injection/Zero SpeedThreshold
DC Injection Braking Current
DC Inject Braking Time at Stop
Frequency Detection 2
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