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VLT ® MICRO
d02 Operation continues after momentary power loss. Speed search
starts with the Minimum Frequency.
NOTE: Fault contact is not energized during restart after a momentary power loss. This
parameter determines the AC drive mode of operation after recovery from a momentary
power loss.
Pr.33 Maximum Allowable Power Loss Time
Factory Setting d2.0 Sec
Units 0.1 Sec
Parameter value d0.3 - d5.0 Sec
During a power failure, 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 power will be turned off.
Pr.34 Minimum Base Block Time
Factory Setting d0.5 Sec
Units 0.1 Sec
Parameter value d0.3 - d5.0 Sec
When a momentary power loss is detected, the AC drive output turns off for a specified
time interval determined by Pr.34 before resuming operation. This time interval is called
the "Base Block Time". This parameter should be set to a value where the residual
output voltage is nearly zero.
Pr.35 Speed Search Deactivation Current Level
Factory Setting d100%
Units 1%
Parameter value d30 - d200%
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 drive output frequency is determined to be at a "speed
synchronization" point. The drive will start to accelerate or decelerate back to the
operating frequency at which it was programmed to operate.
INPUT
POWER
OUTPUT
FREQUENCY
OUTPUT
VOLTAGE
Allowable maximum
power loss time
Speed synchronization
detection
OUTPUT
VOLTAGE
OUTPUT
FREQUENCY
INPUT
POWER
Pr.33
Pr.32 = d01
Speed search starts with
the frequency reference value
Pr.34
Min. baseblock
time
Speed
search
operation
Allowable maximum
power loss time
Pr.33
Pr.32 = d0002
Speed search starts with
minimum starting frequency
Pr.34
Min. baseblock
time
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