Learning Advanced Features
operation accelerates the motor back to its frequency reference before
the low voltage trip.
If an instantaneous power interruption occurs and the input power is
disconnected, the inverter generates a low voltage trip and blocks the
output. When the input power returns, the operation frequency before the
low voltage trip and the voltage is increased by the inverter’s inner PI
control.
If the current increases above the value set at Cn.72, the voltage stops
increasing and the frequency decreases (t1 zone). If the current decreases
below the value set at Cn.27, the voltage increases again and the
frequency stops decelerating (t2 zone). When the normal frequency and
voltage are resumed, the speed search operation accelerates the motor
back to its frequency reference before the fault trip.
• Starting with power-on: Set bit 4 to 1 and Ad.10 (Power-on Run) to 1
(Yes). If inverter input power is supplied while the inverter operation
command is on, the speed search operation will accelerate the motor up
to the frequency reference.
Cn.72 SS Sup-Current
The amount of current flow is controlled during speed search operation based
on the motor’s rated current. If Cn.70 (SS mode) is set to 1 (Flying Start-2), this
Cn.73 SS P/I-Gain,
Cn.75 SS Block Time
The P/I gain of the speed search controller can be adjusted. If Cn.70 (SS Mode)
is set to 1 (Flying Start-2), different factory defaults based on motor capacity
are used and defined in dr.14 (Motor Capacity).
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