Toshiba TOSVERT VF-AS3, Instruction Manual

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6. [Advanced] How to use parameters
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■ Setting example of <F302: Regenerative power ride-through> = "2"
• The motor makes a deceleration stop also when the power is restored. However, when the voltage
in power circuit inside the inverter falls to or below a certain value, the control is stopped and the
motor enters the coasting state.
• A motor makes a deceleration stop according to <F310: Dec time at power failure>. The
deceleration time is from <FH: Maximum frequency> to 0 Hz.
• When the voltage falls to <F625: Undervoltage detection level> or less during a deceleration stop
due to power failure, the motor will enter the coasting state. The display shows "StOP", and the
motor is kept in the coasting state after power is restored.
■ Setting example of <F302: Regenerative power ride-through> = "3"
When <F114: Terminal S1 function 1> is set to "62: Synchronized Acc/Dec", and a power failure
synchronized signal is allocated to the terminal [S1].
• When the terminal [S1] is turned ON with <F317: Synchronized stop time> and <F318:
Synchronized reach time> of acceleration/deceleration set to the same value, multiple motors can
be stopped almost at the same time. After power is restored, the motors can reach respective
frequency command values almost at the same time.
• When the terminal [S1] is turned ON, linear deceleration is performed for the specified time by
<F317> from the output frequency at this point to 0 Hz. The S-pattern deceleration and brake
sequence are unavailable.
"StOP" is displayed when the stop process is completed.
• When the terminal [S1] is turned OFF during synchronized deceleration, linear acceleration is
performed for the specified time by <F318: Synchronized reach time> from the output frequency at
this point to the output frequency at which the synchronized deceleration was started or frequency
command value, whichever is lower. The S-pattern acceleration, brake sequence and auto-tuning
are unavailable.
"StOP" disappears when acceleration is started.
Input power
Time
Deceleration stop
Motor speed
Motor speed
Inverter 1
Inverter 2
Power failure
synchronized signal
(Terminal [S1])
Time
<F317>
<F318>