Chapter 5 Parameters_VFD-B Series
5-84
Revision 10/2005, BE13, SW V4.08
DC Braking during Start-up is used for loads that may move before the AC drive starts, such as fans and
pumps. Under such circumstances, DC Braking can be used to hold the load in position before setting it in
motion.
DC Braking during stopping is used to shorten the stopping time and also to hold a stopped load in position.
For high inertia loads, a dynamic braking resistor may also be needed for fast decelerations.
08 - 04
Momentary Power Loss Operation Selection
Factory Setting: 00
Settings 00 Operation stops after momentary power loss.
01 Operation continues after momentary power loss, speed search starts with the
Master Frequency reference value.
02 Operation continues after momentary power loss, speed search starts with the
minimum frequency.
This parameter determines the operation mode when the AC motor drive restarts from a momentary power
loss.
When using a PG card with PG (encoder), speed search will begin at the actual PG (encoder) feedback
speed and settings 01 and 02 will be invalid.
08 - 05
Maximum Allowable Power Loss Time Unit: 0.1
Settings 0.1 to 5.0 sec Factory Setting: 2.0
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.08-04 is only executed when the maximum allowable power
loss time is d5 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
d5 seconds, the operation mode as set in Pr.08-04 is not executed. In that case it starts up normally.
08 - 06
Baseblock Time for Speed Search (BB) Unit: 0.1
Settings 0.1 to 5.0 sec Factory Setting: 0.5
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