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2.
DC Braking during stopping is used to decrease stopping time and also to hold a
stopped load in position. For high inertial loads, a dynamic braking resistor
may be needed for quick decelerations.
8 - 04
Momentary Power Loss Operation Selection
Settings
8 - 05
Maximum Allowable Power Loss Time
Settings
During a power loss, if the power loss time is less than the time defined by this
parameter, the AC drive will resume operation. If the Maximum Allowable Power Loss
Time is exceeded, the AC drive output is then turned off.
8 - 06
Base-Block Time for Speed Search
Settings
When a momentary power loss is detected, the AC drive turns off for a specified time
interval determined by Pr.8-06 before resuming operation. This time interval is called
Base-Block. This parameter should be set to a value where the residual output voltage
is nearly zero, before the drive resumes operation.
This parameter also determines the searching time when performing external
Base-Block and fault reset.
8 - 07
Maximum Speed Search Current Level
Settings
Following a power failure, the AC drive will start its speed search operation, only if the
output current is greater than the value determined by Pr.8-07.
current is less than that of Pr.8-07, the AC drive output frequency is at a "speed
synchronization point". The drive will start to accelerate or decelerate back to the
operating frequency at which it was running prior to the power failure.
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d 0
Operation stopped after momentary power loss
d 1
Operation continues after momentary power loss
Speed search start with the Master Frequency reference
value
d 2
Operation continues after momentary power loss
Speed search starts with the min frequency
d 0.3 to d 5.0Sec
d 0.3 to d 5.0Sec
¦
d 30 to d 200
5-37
VFD-L Series
Factory Setting: d 0
Factory Setting: d 2.0
Unit: 0.1Sec
Factory Setting: d 0.5
Unit: 0.1Sec
Factory Setting: d 150
Unit: 1%
When the output
5
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