Chapter 4: AC Drive Parameters
4–62
Maximum Allowable Power Loss Time Default Setting: 2.0
Range: 0.3 to 5.0 sec
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 turned off.
Base-Block Time for Speed Search Default Setting: 0.5
Range: 0.3 to 5.0 sec
• When a momentary power loss is detected, the AC drive turns off for a specified
time interval determined by P6.13 before resuming operation. This time interval is
called Base-Block. This parameter should be set to a value where the residual
output voltage due to regeneration is nearly zero, before the drive resumes
operation.
• This parameter also determines the searching time when performing external Base-
Block and Fault Reset (P6.01).
Maximum Speed Search Current Level Default Setting: 150
Range: 30 to 200%
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 P6.14. When the
output current is less than that of P6.14, 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.
Max. Allowable Power Loss Time
Max. Allowable Power Loss Time
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