ANYHZ FST-500 Series, Manual, Page: 56 / 151

FST 500 Manual
- Page 56 -
Pr.33 Maximum Allowable Power Loss Time Unit: 0.1sec
Settings 0.3 to 5.0 sec Factory Setting: 2.0 sec
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After a power loss, the AC drive will resume operation only if the power loss duration is shorter
than the time defined by Pr.33. If the Maximum Allowable Power Loss Time is exceeded, the AC
drive output is then turned off.
Pr.34 Base-Block Time for Speed Search Unit: 0.1sec
Settings 0.3 to 5.0 sec Factory Setting: 0.5 sec
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When a momentary power loss is detected, the AC drive will stop its output and will wait during a
specified time interval called Base Block (entered in Pr.34) before resuming operation. Setting of
this parameter should make the residual output voltage due to regeneration almost
zero, before the drive resumes operation.
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This parameter also determines the search time when performing external Base-Block and Fault
Reset (Pr.72).
Pr.35 Maximum Current Level for Speed Search Unit: 1%
Settings 30 to 200% Factory Setting: 150
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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.35. When the output current is less than that of
Pr.35, the AC d
rive output frequency is at a “speed synchronization point” and will accelerate or
decelerate back to the operating frequency at which it was running prior to the power failure.