Chapter 5 Parameters
|
VFD-S Series
Revision August 2008, SE09, SW V2.61
5-59
DC Brake during Start-up is used for loads that may move before AC drive starts, such as
fans and pumps. These loads may also be moving in the wrong direction. Under such
circumstances, DC Brake can be executed to hold the load in position before applying a
forward motion.
DC Brake during stopping is used to decrease stopping time and also to hold a stopped load
in position. For high inertial loads, a dynamic brake resistor may be needed for quick
decelerations.
8-04
Momentary Power Loss Operation Selection
Factory Setting: d0
Settings
d0
Operation
stops after momentary power loss
d1
Operation continues after momentary power loss, speed search
starts with the Master Frequency reference value
d2
Operation continues after momentary power loss, speed search
starts with the minimum frequency
8-05
Maximum Allowable Power Loss Time
Unit: 0.1
Settings
d0.3 to d5.0Sec
Factory Setting: d2.0
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 Speed Search
Unit: 0.1
Settings
d0.3 to d5.0Sec
Factory Setting: d0.5
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
Current Limit for Speed Search
Unit: 1
Settings
d30 to d200
％
Factory Setting: d150
