12.1 A: INITIALIZATION
442 SIEPCYEUOQ2V01A Q2V Technical Manual
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 Ref.@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 [DCI Braking Current] recommended setting: 50% to 75% (V/f Control, Open Loop Vector Control)
–b2-03 [DCInj Time@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 [Out
PhaseLoss Selection = 1PH Loss Det, or 2/3PH Loss Det]. 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 Name
b2-01 ZSpd/DCI Threshold
b2-02 DCI Braking Current
b2-04 DCInj Time@Stop
H2-xx = 5 FreqDetect 2
Figure 12.6 DC Injection Braking at Stop Function
Note:
• If the mechanical operation of the holding brake is slow, use DC Injection Braking 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 Ref@Stop]: Minimum output frequency to 3.0 Hz
When Frequency Detection 2 is OFF, it is less than L4-01 [SpAgree Det.Level] - L4-02 [SpAgree Det.Width].
–b6-04 [Dwell Time@Stop] recommended setting: 0.3 s to 0.5 s
–b2-04 [DCInj Time@Stop] recommended setting: 0.0 s
■ Analog Input FilterTime Constant
When b1-01 = 1 [Freq. Ref. Sel. 1 = Analog Input], it adds noise to the analog frequency reference during run.
• Minimize the effects of noise.
• Change H3-13 [An.In FilterTime Constant] to a range of 0.01 s to 0.10 s.
■ Startup Current Check
When you do a test run, set L8-41 =1 [HCA alarm Selection = Enabled] and use U4-13 [Peak Hold Current] and
a clamp ammeter with the machine under load and not under load to check the motor current during start up.
If the motor torque is not sufficient during start up or if the timing between the motor and the holding brake is
unsatisfactory and causes the motor to lock, a large quantity of current will flow. In these conditions, adjust the
parameters again and decrease the load to decrease the current to less than 150%. If the current flow is more than
150% of the drive rated current, the heat stress on the IGBTs will decrease the service life of drive parts.
To decrease the effects of heat stress, decrease the carrier frequency of the drive to 2.0 kHz to 2.5 kHz for
applications where low audible noise is not necessary.
■ Overvoltage Suppression Function
If the overvoltage suppression function is used in elevator type applications, there is a risk of rollback and falls.
Set L3-11 = 0 [Overvolt Supression Select = Disabled].
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