Speed Search Time; Maximum Speed Search Current; Momentary Power Loss Operation - Delta Electronics AC Drive VFD-F Series User Manual

08 - 06

Speed Search Time

Settings
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

Settings
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.
Maximum allowable
power loss time
08-05
Power
Input
08-04=01
B.B. Time
Output
08-06
Frequency
Output
Voltage
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
0.1~5.0 Sec
30~150%
Speed
Synchronization
Speed Search
Detection

Momentary Power Loss Operation

5-41
Factory Setting: 0.5
Factory Setting: 110
Max. Allowable
Power Loss Time
08-05
08-04=02
B.B.Time
08-06
VFD-F Series
Unit: 0.1
Unit: 1
5