Delta Electronics VFD-VE Series manual 07-08, Baseblock Time for Speed Search BB Unit

Chapter 4 Parameters

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	VF	VFPG SVC FOCPG TQRPG	Factory Setting: 0.5
mode
	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. 7

Output frequency(H)

Output voltage(V)

Output current A

07-09 Current Limit for

Speed Search

FWD Run

B.B.

Input B.B. signal

Stop output voltage

Disable B.B. signal

Waiting time Pr.07-08

Speed search Synchronization speed detection

7Frequency command before B.B. Time

B.B. Search with last output frequency downward timing chart

Revision August 2008, 03VE, SW V2.04 4-109