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

Name

b2-01

DC Injection/Zero SpeedThreshold

b2-02

DC Injection Braking Current

b2-04

DC Inject Braking Time at Stop

H2-xx = 5

Frequency Detection 2
Figure 1. 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