Delta VFD-EL-W Series - Page 122

Chapter 4 Parameters｜VFD-EL-W
117
Time
B.B.
Fig 2: B.B. Speed Search with Last Output Frequency Downward Timing Chart
(Speed Search Current doesn't Attain Speed Search Level)
A
Input B.B. signal
Stop output voltage
Disable B.B. signal
Waiting time 08.07
Speed Search
Synchronization speed detection
Output frequency
(H)
08.08 Current Limit
for Speed SearchSpeed
FWD Run
Time
B.B.
Fig3: B.B. Speed Search with Minimum Output Frequency Upward Timing Chart
A
Input B.B. signal
Stop output voltage
Disable B.B. signal
Waiting time 08.07
Restart
Synchronization speed detection
Keep accelerating
A
Output frequency
(H)
06.01
Over current
stall prevention
during acceleration
FWD Run
08.07
Speed Tracking Delay Time
Default: 0.5
Settings
0.1–5.0 sec.
 When momentary power loss is detected, the AC motor drive blocks its output and then waits for
a specified period of time before resuming operation. Set this parameter to the time that allows
the residual voltage at the output side to decrease to 0V before activating the drive again.
 When the external interrupt (B.B.) resets and restarts after fault, you can also use this parameter
for speed tracking.
08.08
Speed Tracking Action Level
Default: 150
Settings
30–200%
 Limits the drive output current during the speed tracking.
 When executing the speed tracking, the V/F curve is defined by the settings in Parameter Group
01.