4-159
(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
Notes:
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.
07-37
Pre-excitation time
Range
【
0.00~10.00
】
Sec
07-38
Pre-excitation level
Range
【
50~200
】
%
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.
07-37
Pre-excitation time
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.
