Maximum Power Loss Duration; Base Block Time - Delta C2000 series User Manual

The motor has the characteristics of big inertia and small obstruction. For example, in the
equipment with big inertia wheel, it doesn't need to wait to execute operation command until
wheel is complete stop after re-start to save time.
Setting 2: Operation continues after momentary power loss, speed search starts with the master
frequency after drive output frequency and motor rotator speed is synchronous. The motor has
the characteristics of small inertia and bigger obstruction.
In PG control mode, the AC motor drive will execute the speed search function automatically by
the PG speed when this setting isn't set to 0.

Maximum Power Loss Duration

Settings 0.1~20.0 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.

Base block Time

Settings 0.1~5.0 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.
Output frequency(H)
Output voltage(V)
Output current
07-09
Current Limit for
Speed Search
FWD Run
B.B.
B.B. Search with last output frequency downward timing chart
Chapter 12 Description of Parameter Settings|C2000 Series
7
A
12-117
Factory Setting: 2.0
Factory Setting: 0.5
Input B.B. signal
Stop output voltage
Disable B.B. signal
Waiting time Pr.07-08
Speed search
Synchronization speed detection
Frequency command before B.B.
7
Time