*3. When the Deceleration Stop Selection on Power Interruption (b050) is set to 01 (Enabled: Deceleration stop),
be sure to set the Deceleration Hold Level on Power Interruption (b052) to a value higher than the incoming
voltage multiplied by the square root of 2. Set b052 to 380 VDC or higher for 240-VAC incoming voltage and
to 750 VDC or higher for 480 VAC-incoming voltage, respectively. If it is set to a value less than the incoming
voltage multiplied by the square root of 2, the inverter will remain in a deceleration stop state even after the
power is restored and cannot decelerate. (The inverter accepts neither RUN command nor frequency refer-
ence input until the deceleration stop operation is completed.) In this case, turn OFF the inverter power supply
to complete the operation of the deceleration stop function.
If the value set in the Deceleration Hold Level on Power Interruption (b052) is less than the value set in the
Starting Voltage on Power Interruption (b051), the inverter will ignore the b052 setting and operate according
to the b051 setting.
*4. If the value set in the Deceleration Starting Width on Power Interruption (b054) is too large, the inverter may
decelerate rapidly, which causes an overcurrent. If an overcurrent occurs, decrease the b054 value.
Conversely, if the Deceleration Starting Width on Power Interruption (b054) is too small, or if the Deceleration
Time on Power Interruption (b053) is too long, the regenerative energy is in short supply and the internal DC
power supply voltage of the inverter decreases, which causes an undervoltage. If an undervoltage occurs, in-
crease the b054 value or decrease the b053 value.
*5. In high-frequency mode.
Use this setting to have the inverter decelerate and stop after the power supply is shut off during opera-
tion, while preventing it from exceeding the Deceleration Hold Level on Power Interruption (b052).
If the power supply is shut off during operation, the inverter will decelerate by the amount set in the
Deceleration Starting Width on Power Interruption (b054) at once when the voltage drops below the
Starting Voltage on Power Interruption (b051) value, then decelerate according to the Deceleration
Time on Power Interruption (b053) setting.
However, during deceleration, if the inverter falls in an overvoltage state due to regeneration (if it
reaches the Deceleration Hold Level on Power Interruption (b052) value or higher), this function will not
be activated until the overvoltage state is canceled, so deceleration stop will not occur.
Precautions for Correct Use
•
When the Deceleration Stop Selection on Power Interruption (b050) is set to 01 (Enabled:
Deceleration stop), be sure to set the Deceleration Hold Level on Power Interruption (b052)
to a value higher than the input power supply voltage multiplied by the square root of 2. Set
b052 to 380 VDC or higher for 240-VAC incoming voltage and to 750 VDC or higher for 480
VAC-incoming voltage, respectively. If it is set to a value less than the incoming voltage volt-
age multiplied by the square root of 2, the inverter will remain in a deceleration stop state
even after the power is restored and cannot decelerate. (The inverter accepts neither RUN
command nor frequency reference input until the deceleration stop operation is completed.)
In this case, turn OFF the inverter power supply to complete the operation of the deceleration
stop function.
•
If the value set in the Deceleration Hold Level on Power Interruption (b052) is less than the
value set in the Starting Voltage on Power Interruption (b051), the inverter will ignore the
b052 setting and run according to the b051 setting.
•
This function will not reset until the deceleration stop operation is completed. To restart the
inverter after power recovery during this function operation, in a stop state, input the RUN
command again.
•
If the value set in the Deceleration Starting Width on Power Interruption (b054) is too large,
the inverter may decelerate rapidly, which may cause an overcurrent. If an overcurrent
occurs, decrease the b054 value.
•
If the Deceleration Starting Width on Power Interruption (b054) is too small, or if the Deceler-
ation Time on Power Interruption (b053) is too long, the regenerative energy is in short sup-
ply and the internal DC power supply voltage of the inverter decreases, which causes an
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