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E6581528
E-32
5
Note 3: If you change the carrier frequency, you may need to reduce the inverter’s continuous output current.
⇒ Refer to Section 1.4.4, “Current reduction curve.”
Note 4: If the motor becomes overloaded when is set to or (carrier frequency not decreased
automatically), an overload trip occurs.
Note 5: If is set to or , V/F control mode (Pt=0) will be set and the carrier frequency is restricted to
4kHz automatically.
The setting value 4 and 5 are effective for the unit VFAS1-6110KP or larger.
5.18 Trip-less intensification
5.18.1 Auto-restart (Restart during coasting)
: Auto-restart control selection
Warning
Mandatory
• Do not go near motors and equipment.
Motors and equipment that have stopped temporarily after momentary power failure will restart
suddenly after recovery. This could result in unexpected injury.
• Attach warnings about sudden restart after a momentary power failure on inverters, motors and
equipment for prevention of accidents in advance.
• Function
Auto-restart detect the rotating speed and direction of rotation of the motor during coasting or momentary
power failure, to ensure that the motor restarts smoothly (Motor speed search function). This parameter also
allows commercial power operation to be switched to inverter operation without stopping the motor.
During operation, “” is displayed.
1) Auto-restart after momentary power failure (Auto-restart function)
In
p
ut volta
g
e
Motor s
p
eed
F-CC
ON
OFF
=: This function operates after power has been restored following detection of an undervoltage by the main
circuits and control power.
Title Function Adjustment range Default setting
Example of setting
Auto-restart control
selection
:Disabled
:At auto-restart after momentary stop
: When turning ST operation standby
signal on or off [Note 1]
: +
:At start-up
or
Note 1: ST standby signal can be turned on and off by turning on and off the terminal to which it is assigned.
Example: When ST standby signal is assigned to the S3 terminal, setting to , to (cancels the “ST
standby signal always ON” setting. By default, this parameter is set to : always ON.) and to
(assigns ST standby signal to the S3 terminal) makes it possible to momentarily stop and restart the motor
by just turning the S3 terminal off and then back on.
* If the motor is restarted in retry mode, this function will operate, regardless of the setting of this parameter.
* The function (=,,,) is activated when the reset of trip or the power is turned on.
* The function (=,) is activated when an undervoltage is detected in the main circuit.