Delta Electronics AC Motor Drive VFD-G - Manual (Page 115)

Chapter 4 Parameters|
4-64 Revision July 2008, EG03, SW V1.06
The allowable power loss time must in the condition that AC drive auxiliary power is working
normally. If auxiliary power is turned off in the allowable power loss time, the actual allowable
power loss time will be shorter than the parameter setting.
08 - 06 Speed Search Time Unit: 0.1
Settings 0.1~5.0 Sec Factory Setting: 0.5
This parameter determines the delay time from fault (power loss, OV, OC or BB) recovery to
start to execute the function of speed search time.
08 - 07 Maximum Speed Search Current Unit: 1
Settings 30~150% Factory Setting: 110
This parameter determines maximum current of speed search.
Maximum speed search current will have influence with synchronization attained time. The
greater this parameter is set, the faster it will be synchronization. But if the parameter setting
value is too great, it may occur over-loaded protection.
If 08-04 is set to 01: when speed search is from top downward, output frequency is searched
from master frequency command downward. Now output voltage and output current will be
added from zero. When output current is equal to 08-07 setting value, AC drive output current
will retain in a fixed value and output frequency will keep on searching from top downward.
When output frequency and output voltage is overlapped with V/f setting frequency, AC drive
will judge that is synchronization attained and accelerates from V/f curve to master frequency
command.
If 08-04 is set to 02: AC drive will accelerate according to V/f curve and won’t do any special
treatment.
Power
Input
Output
Frequency
Output
Voltage
B.B. Time
08-06
Speed Search
Speed
Synchronization
Detection
Momentary Power Loss Operation
Maximum allowable
power loss time
08-05
08-04=01
B.B.Time
08-06
Max. Allowable
Power Loss Time
08-05
08-04=02