4-156
(b) Speed search in recovery period of momentary power failure
Run command
Search command
Output frequency
Output voltage
Speed search
operation
Output current
Speed search decel time (07-21)
Return to voltage at normal operation
Voltage recovery time (07-23)
(07-20)
t
t
t
t
t
V/f during speed search
(07-18)
Momentary power loss
Minimum b.b. time (07-18) t
t
Figure 4.3.66 Speed search in recovery period of momentary power failure
Note：
If the minimum base block time (07-18) is longer than the momentary power failure
time, the speed search starts operation after the minimum base block time (07-18).
If the minimum base block time (07-18) is too short, the speed search operation begins
immediately after power has been restored.
07- 29 Run Command Selection at the Action of DC Braking
Range
【0】：Not Allowed to Run
【1】：Allowed to Run
After DC braking action starts, if run command selection is set to 0, it will not run until DC
braking action ends.
If run command election is set to 1, it is not required to wait for the ending of DC braking action.
It can run during DC braking action process.
07- 37 Pre-excitation time
Range 【0.00~10.00】Sec
If a high starting torque is required for the application, especially for a large horsepower motors, the
pre-excitation operation can be used to pre-flux (magnetize) the motor.
(1) When an operation command (forward or reverse) is activated, the inverter will automatically
start pre-excitation based on the time set in parameter 07-37.
(2) The time for the flux to reach 100% is a function value of motor’s electrical time constant, see
figure 4.3.62.
(3) Electrical time constant (quadratic by-pass circuit time constant) can be calculated by
motor parameter setting (group 02).
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