Delta Electronics AC Motor Drive VFD-VE Series - Manual (Page 158)

Chapter 4 Parameters|
Revision August 2008, 03VE, SW V2.04 4-109
Settings 0.1 to 5.0 sec
If the duration of a power loss is less than this parameter setting, the AC motor drive will
resume operation. If it exceeds the Maximum Allowable Power Loss Time, the AC motor drive
output is then turned off (coast stop).
The selected operation after power loss in Pr.07-06 is only executed when the maximum
allowable power loss time is ≤5 seconds and the AC motor drive displays “Lu”.
But if the AC motor drive is powered off due to overload, even if the maximum allowable power
loss time is ≤5 seconds, the operation mode as set in Pr.07-06 is not executed. In that case it
starts up normally.
07-08 Baseblock Time for Speed Search (BB) Unit: 0.1
Control
mode
VF VFPG SVC FOCPG TQRPG
Factory Setting: 0.5
Settings 0.1 to 5.0 sec
When momentary power loss is detected, the AC drive will block its output and then wait for a
specified period of time (determined by Pr.07-08, called Base-Block Time) before resuming
operation. This parameter should be set at a value to ensure that any residual regeneration
voltage from the motor on the output has disappeared before the drive is activated again.
B.B.
A
Output frequency(H)
Output voltage(V)
Output current
07-09
Current Limit for
Speed Search
FWD Run
Time
B.B. Search with last output frequency downward timing chart
Input B.B. signal
Stop output voltage
Disable B.B. signal
Waiting time Pr.07-08
Speed search
Synchronization speed detection
7
7 Frequency command before B.B.