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E6581301
E-32
5
Note 2: If EH is set at 2.0kHz or above, it cannot be decreased below 2.0kHz during operation. Changes made to
decrease EH below 2.0kHz take effect when operation is restarted after it is stopped.
Note 3: If EH is 1.9kHz or less, you cannot change the setting at 2.0kHz or more. Changes made to increase EH
to 2.0kHz or above take effect immediately.
Note 4:
If
RV
(V/f control mode selection) is set to
,
,
,
, or
, the inverter sets a lower limit of 2.0kHz for
EH
.
Note 5: If H= or is set, it automatically becomes V/f control (RV=0) mode. Moreover, the lower-limit of the
career frequency becomes 4kHz.
Note 6: 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 7: If the motor becomes overloaded when H is set to or
(carrier frequency not decreased
automatically), Main circuit element overheat protection (OC1P, OC2P, OC3P) may operate.
Note 8: For the setting H= or to take effect, power needs to be turned off and then turned back on.
Note 9: When setting H to or , be sure to set EHat 4.0kHz or less.
Note 10: When setting the carrier frequency (EH) between and .kHz, you are recommended to set H
below 130%.
Note 11: This parameter works at 200V-55kW and above models, and 400V-90kW and above models.
Note 12: If carrier frequency (EH) value is set by more than 4 kHz on the assumption that the length of the cable is
30m or less, set H=1.
5.18 Trip-less intensification
5.18.1 Auto-restart (Restart during coasting)
WXU
WXUWXU
WXU : Auto-restart control selection
H
HH
H : Auto-restart
mode
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, “TVT[” is displayed.
1) Auto-restart after momentary power failure (Auto-restart function)
Input voltage
Motor speed
F
-
CC
ON
OFF
ŬWX=: 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
Setting value
WXU
Auto-restart control
selection
:Disabled
:At auto-restart after momentary stop
:When turning ST on or off
: +
:At start-up
or
* If the motor is restarted in retry mode, this function will operate, regardless of the setting of this parameter.
* The function (WXU=,,,) is activated when the reset of trip or the power is turned on.
* The function (WXU=,) is activated when an undervoltage is detected in the main circuit.